The first is caused by allergic agents from the outside environment, including dust, pollen, banana oil and chloroform. |
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The transfer of the pollen grain from the stamen to the stigma initiates the processes that can result in fertilization. |
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A pollen grain was considered germinated if pollen tube length was greater than the diameter of the pollen grain. |
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This method causes callose in the pollen grains and tubes to be stained and to fluoresce brightly under short-wave light. |
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As pollen grains and pollen tubes emitted very strong fluorescence, the pathways of growing pollen tubes could be easily observed. |
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At about 3 weeks of age workers leave the hive as foragers who gather pollen and nectar and are exposed to a more variable environment. |
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Sixty-one triploid F 1 plants were crossed with diploid pollen donors for testcrosses. |
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For example, he cites their unwillingness to concede that pollen from GM crops could cross-fertilize nearby conventional or organic varieties. |
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Canola pollen can also cross-fertilise related plants such as broccoli, cauliflower, cabbage and many common weed species. |
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That's when cross-pollinating plants release their pollen into the air for fertilization. |
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Further complicating matters, corn is cross-pollinated, and corn pollen can travel fairly long distances, according to some. |
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Ginkgo trees, like some conifers and cycads, are dioecious, producing pollen and seeds on separate trees. |
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Two types of monad pollen are present in early orchids, namely that with pollenkitt and that with elastoviscin. |
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They rapidly destroyed the well-organized cytoarchitecture characteristic of a typical growing pollen tube. |
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Furthermore, behavioral data reveal that pollen collection commonly is followed by geitonogamous pollination. |
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Unless pollen is transported to another plant, geitonogamous self-pollinations therefore become more likely when plants are visited. |
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Consequently, it reduces male fitness because geitonogamous pollen grains are barred from fertilizing ovules. |
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Generically, it is nearly allied to Epidendrum, from which its eight pollen masses at once distinguish it. |
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With this in mind, why the sudden panic about a few pollen grains and the outrage against gene manipulation by genetic engineering? |
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Because flowering plants vary from region to region and bees rarely stray far from the hive, the pollen print provides a sort of geocode. |
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Hot, dry conditions also reduce the favorable climate for pollen germination. |
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The temporal aspects of stigma receptivity and pollen longevity were investigated in relation to protandry and breeding system. |
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By flowering early, the goat willow provides bees with both pollen and nectar when few other flowers are available. |
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Baseline sensitivity to grass pollen as measured by the conjunctival provocation test did not differ. |
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A representative deodar tree, situated on the agricultural fields of Premnagar village was selected as the pollen source. |
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In several cases the pollen tubes emerged and elongated rapidly, then burst, with the cytoplasm streaming out of the burst tip. |
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On each individual, three flowers were emasculated before anthesis and isolated using silk bags, while the fourth was taken as the pollen donor. |
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Anther culture involves the induction of embryoid formation from immature pollen and subsequent regeneration of embryoids into plantlets. |
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Natural selection disfavors mutations that cause pistils to accept pollen from genotypes that reject their pollen. |
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Genetic differentiation among populations is principally a function of gene flow among populations via pollen and seed dispersal. |
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Aneuploid pollen grains compete poorly with euploid pollen and so aneuploidies are eliminated when propagated through the male. |
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These activities not only disturb bees but also interfere with normal pollen production, germination, and fertilization. |
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The possible presence of pollenkitt was determined by examining fresh pollen with an optical microscope. |
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He said pollen would not escape into the local environment because sugar beet did not flower until after it had been harvested. |
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Short elongated elements occur on the orbicule wall, similar to those present on the pollen exine. |
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Measurements of pollen tube length were recorded directly by an ocular micrometer fitted to the eyepiece of the microscope. |
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Skin tests with pollen and other common causes of allergy help confirm what causes your drippy nose. |
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Females produced more pollen per anther than males, and pollen size was the same in both sexes. |
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The bird then spreads the pollen to other B. ringens, thereby cross-pollinating the plant species. |
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These pollen sacs can face outward, in which case the stamens are called extrorse, or inward, in which case the stamens are called introrse. |
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Bees occasionally collect olive pollen, but wind is the primary pollination vector. |
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These bees visited flowers in search of pollen, adopting a supine posture as they entered the corolla tube. |
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The stigmas were then pollinated with pollen from a flower whose anther had dehisced that day. |
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Plants produced smaller flowers producing less pollen and with poor germination and tube growth. |
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Each experiment was carried out on flower heads which had been protected from foreign pollen by bagging. |
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In addition to seeds, the promoters directed reporter gene expression in pollen and in seed coats. |
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This could help relieve pollen limitation caused by insufficient quantity of pollen. |
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Freshly harvested pollen was dusted onto a microscope slide with a brush to which four or five drops of stain were added. |
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This species has a peculiar mechanism by which the flower dispenses pollen to different visitors. |
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What, then, are the roles of the two different flower types in pollen production? |
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If the poinsettia is already producing pollen, a portion of its useful display life has already passed and the bracts will begin to fade. |
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The family never suffers from hay fever or allergies because ionisers monitor online pollen reports and keep the air dust-free. |
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A liquid fixative was deliberately not used in order to prevent dislodging of pollen grains. |
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We used pollen grain size as an indicator of ploidy level by measuring length and width of the pollen grains under a microscope. |
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Samples of corn pollen were weighed at regular intervals and their dry weight was determined, as described above. |
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The filter removes pollen and dust that is brought in from the outside through the heating and cooling system. |
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Smearing of pollen is facilitated by the fanning out of anthers borne at the ends of the filaments. |
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Amongst other fossil conifers cones were shed rapidly after pollen dispersal. |
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The production of pollen and seed cones was studied in five branches chosen at random on each individual. |
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Third, reduced pollen and seed fertility may both indirectly result from this deleterious effect. |
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These will have been totally ineffective because international research shows canola pollen can travel up to 6 km to infect other canola crops. |
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The tree pollen will soon disappear and, in the meantime, I have friendship and companionship to help me along. |
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Most biologists believe the famed waggle dance of the honeybee constitutes coded language that directs other bees to nectar and pollen. |
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Since there may be a low level of background pollen abortion, a second approach is more accurate. |
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For example, petals may wilt and abscise more rapidly after pollen deposition on the stigma or pollen tube growth through the style. |
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Honey bees occasionally invade homes and establish a colony, building combs of wax containing honey, pollen and brood in wall spaces. |
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Particles that have these kinds of characters are pollen, acarids, animal dandruff and fungi. |
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When a male wasp crashes into the orchid, it gets covered with orchid pollen. |
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Because its pollen is heavy and will not travel far, its seed will produce good results. |
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In addition, it is questionable whether retention of water is significant for pollen that is shed in the dry state. |
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Honey bees occasionally invade homes and establish a colony, building combs of wax containing honey and pollen, and brood in wall spaces. |
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When sunflower was crossed with Jerusalem artichoke, F 1 hybrid plants carried 51 chromosomes and showed reduced pollen fertility. |
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However, this concept is challenged by the discovery of different pollen cones from the Arkansas and English Wealden localities. |
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It is wind-born pollen from plants that have inconspicuous flowers like wild grasses or ragweed that are the major causes of respiratory allergy. |
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As the style grows and the papillae develop, adherent pollen grains are observed with increasing frequency. |
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The cone specimens are mostly compressed or adpressed in preservation but their carbonized remains contain ribbed pollen. |
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Within-flower transfer of pollen from anthers to stigma was achieved by depressing the keel petal of newly opened flowers using fine forceps. |
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Pseudopollen is a mealy material, usually whitish or yellowish in colour, which superficially resembles pollen. |
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Using bright colors and sweet perfumes, many orchids falsely advertise a meal of pollen and nectar. |
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The pollen count in the Midlands has very little dependency on the direction the winds are coming from. |
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Outside in the company parking lot, windblown trees shake a fine yellow dusting of pollen over asphalt and cars. |
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Keep car windows closed and consider buying a pollen filter for the air vents in your car. |
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The triploid and aneuploid clones studied yielded viable seeds whose number per fruit was strongly dependent on the pollen donor. |
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This phenomenon of pollen affecting fruit characteristics has been known as xenia. |
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Xenia is the effect of pollen on the development and characteristics of the fruits. |
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Xenia describes any immediate effect a pollen grain has on the germ or endosperm of seed plants. |
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Treatment O was conducted to examine xenogamy through artificial pollination using pollen from flowers 5 m away, but within the same population. |
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These genes have multiple alleles and are expressed either in the stigma or in the pollen. |
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First, allergic reactions are caused by allergens, the three most common ones being dust and mites, pollen and nuts. |
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Work is now underway to make the vaccine effective for people whose asthma is caused by allergies to dust mites and pollen. |
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This specialized system is thought to be an adaptation promoting allogamy by secondary pollen presentation. |
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There was a thunder storm here this morning, and I was hoping that the rain might lay the pollen and dust a bit. |
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If pollen from an herbicide-resistant plant gets carried by the wind, it could pollinate a weed that's a relative of the plant. |
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A single pollinator imports sufficient pollen into an individual fig to initiate a full complement of seeds. |
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She starts with either nettles or bee pollen, moving from there, if necessary, to an ambrosia or eye-bright tincture. |
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The pollen certificate might help them get a fail upgraded to a pass grade, or even a lower than expected pass grade increased. |
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Like other seed plants, angiosperms are heterosporangiate, producing pollen and ovules in different organs. |
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They eat exposed pollen on the anthers, while other pollen grains adhere to their legs. |
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Fresh pollen was collected from anthers on plants by gently tapping the stems of plants while holding a collecting tray below the tassels. |
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When taking nectar, hummingbirds contacted anthers, receiving pollen on their bill. |
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For estimation of pollen production, two anthers from each flower bud were examined. |
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In an individual flower, anthesis starts at the end of the day and by the time the bats start feeding, there is copious pollen. |
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Anthers were isolated from flowers at anthesis and pollen grains were collected. |
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But if you have hay fever, your body produces antibodies in response to pollen. |
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Tapetal material is deposited on the developing pollen grains forming the pollen coat. |
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Planting female trees in one's own yard will attract and then trap incoming airborne pollen from males of their own species. |
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Ordinary microscopic slides, covered with a thin coat of petroleum jelly were used as pollen traps. |
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Allergic rhinitis is most commonly caused by grass pollen, but tree and weed pollens and mould spores can also cause attacks. |
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The wild and weedy rice taxa were used as pollen recipients, whereas the cultivated rice was used as the pollen donor. |
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This primary function of pollen is a constraint that suffices to explain why apomictic grasses make pollen. |
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Eretmonia pollen sacs are born in pedicellate clusters that arise as a branch from the adaxial side of the mid vein of a modified leaf. |
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He's an internationally-renowned artist who set up an installation at the art gallery using pollen, wax, rice and milk. |
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Environmental conditions such as temperature, light intensity and relative humidity influence pollen longevity. |
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This dung or carrion mimicry attracts flesh flies, rove beetles, and even mosquitoes, all of which have been observed with pollen on them. |
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Apart from honey, they produce beeswax, propolis, royal jelly and bee pollen, all of which have significant medicinal and cosmetic applications. |
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Bee pollen is used to improve digestive assimilation as well as athletic performance. |
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People who breathe in the fine pollen may have an asthma or hay fever attack as a result. |
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Each anther cone was gently agitated to release the pollen sacs into the dye solution. |
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Saffron is made up of tiny filaments that are the dried pollen stigmas of the saffron flower. |
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This protein has a pectate lyase enzyme activity and could be involved in cell wall elaboration during germination and pollen tube growth. |
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Attempts to hyposensitize by administering bee pollen may produce severe anaphylaxis and other acute or chronic responses. |
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At Wollaston in Northamptonshire, the discovery of grape pollen in Roman planting trenches seems to have clinched the argument. |
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I estimated the amount of autogamous pollination by comparing the stigmatic pollen loads of intact and emasculated flowers. |
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On a still smaller scale, magnified several hundred times, similar patterns emerge on the surface of a pollen grain. |
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Pollination used both stored pollen and fresh pollen collected at the time of pollination from the plants whose tassels had remained attached. |
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During pollination the female portion of the plant receives pollen from the tassel, resulting in fertilization of the ovule. |
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The path of pollen tubes has not been investigated, as male flowers were not available. |
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When the stigma lobes spread out, this pollen is then deposited on the inner stigmatic surface. |
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This means the dose can be tailored to the pollen count and the allergic response. |
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Sterile plants produce microspores aborted in tetrads, no visible pollen shed, and parthenocarpic pods bearing no seeds. |
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As pollinators removed pollen from the thecae, their walls collapsed and the anthers curled down gradually. |
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According to Dr. O'Toole, people are most at risk from hay fever when the pollen count is high. |
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The pollen exinal thinnings are comparable, and the outer sculpturing of both forms consists of identical short spinules. |
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Information on aperture type, exine sculpturing and the diameters of pollen grains were cited from Liang. |
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The two morphs of both species produce equivalent numbers of pollen grains, but the grains differ with respect to exine sculpturing and size. |
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The mason-wasp does not furnish the cell she has thus constructed with pollen and honey, like the solitary bees, but with living caterpillars. |
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The following table provides a useful guide to fluctuations in pollen levels in Ireland during the spring, summer and autumn seasons. |
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The tapetal tissue has a secretory role providing essential nutrients required for microspore and pollen grain development. |
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Aside from the hydrophilous pollination mechanism, the pollen grain morphology is also very distinct. |
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That imbalance prevents seeds and pollen from developing normally, making the mutant plants sterile. |
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One example, from the Calhoun Flora of Illinois, is a seed fern that bears prepollen far bigger than any known wind-dispersed pollen. |
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We also show that cellular responses are propagated in a basipetal direction in P. rhoeas pollen tubes. |
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Flowers of all species under study were selfed to determine the time taken by pollen tubes to reach the ovules. |
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Microspores cultured in vitro in a rich medium develop into mature pollen grains, which are fertile upon pollination in vivo. |
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The objective of this study was to develop a suitable medium to improve in vitro pollen germination in pigeonpea. |
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As for calculation of the selfing rate, self-pollination was with pollen from other flowers of the same plant. |
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Insects such as bees facilitate pollination as they buzz from plant to plant while feeding on nectar or collecting pollen. |
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The harvested flowers provided pollen samples ranging from 0 h old, to over 72 h old, at 12 hourly age intervals. |
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Think about the concentric pattern of honey, pollen, and brood that arises on the honey combs of a beehive. |
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Those who suffer from hay fever, or who are allergic to bee stings, however, may have an adverse reaction to pollen. |
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Transmitted light micrographs of the same samples show GUS activity in pollen tubes. |
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At the micropylar end where the pollen tube delivers the two sperm cells, the egg cell is flanked by two synergids that assist in fertilization. |
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It remains to be studied exactly how the pollen tubes reach the micropyle of the ovules. |
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However, pollen tubes from control pollen showed normal morphology when growing towards the micropyle of an ovule in a HTS plant. |
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In pollen cones, microsporangia are borne on a single bract without a trace of a second, subtending structure. |
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I stayed clear, took a haphazard line, and waded through the heather midst a cloud of pollen. |
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Adults live on flower nectar and pollen and are especially fond of lantana and shepherd's needle. |
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The female mining bee stocks each cell with pollen and nectar she collects from flowers and then deposits an egg on the food mass. |
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The trebuchet allows the flower to throw pollen further than a simple catapult would, she said. |
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Similar to pollen germination, the modified bilinear function described the response of pollen tube length to temperature. |
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If you have asthma, and you inhale the airborne pollen, you may start coughing, wheezing, and be short of breath. |
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Anthers were dissected under a binocular microscope and pollen was gently squashed in staining solution under a coverslip. |
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In vivo, the repression of genes involved in starch biosynthesis has been reported to block pollen development. |
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In self-pollination, the flower is monoclinous and the stigma receives pollen from the anthers of the same flower. |
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The pollen count in your area is given alongside most weather forecasts in newspapers and broadcast after the news on television. |
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The maximum distance across the grain ranged from 50 to 70 m, and depended on the expansion of the pollen bladders. |
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The report also says blowers can affect air quality by blowing up dust including pesticides, fertilizers, pollen and dung. |
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The flowers do not bloom until nightfall, when they emit a mouse-like odour, and bats visit them for nectar and pollen. |
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Low temperature, low voltage scanning electron microscopy of uncoated pollen grains was performed as described previously. |
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However, keeping windows and doors closed on days when the pollen count is very high can often help reduce symptoms. |
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In Brassica, pollen specificity is encoded at the multipartite S-locus, a complex region comprising many expressed genes. |
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The male blossom sits on a slender stalk, and the center stamen within the bloom contains the pollen. |
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What can the pollen count tell an allergy sufferer, and what do the numbers mean? |
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Human skin particles, pollen, and smoke are all part of this bothersome brew of irritants. |
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Some people have hypersensitive skin and are allergic to various pollen, fragrant smells and sunlight. |
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Pollinators visit flowers in search of oils, floral fragrances, pollen or floral nectar. |
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One well-known example involves animals that feed on floral nectar but do not transfer pollen between flowers. |
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Flowers offering both nectar and pollen were, as expected, pollinated by diverse small insects, including small bees. |
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When the wind kicks up, I feel as if I'm standing in a snowstorm of pods and pollen. |
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Their Methuselah-like lives leave time for such learning, and their high-octane pollen banquets furnish the brain food. |
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Native social bees visit only male inflorescences in search of pollen and nectar. |
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During ragweed season, Kleinschmidt tracks the daily pollen count when her medication doesn't seem to be working. |
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As adults, some soldier beetle species feed on nectar and pollen, while others are predators that hunt for aphids and other soft-bodied insects. |
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As the pollinator pushes back the brush-like hairs, the valve opens releasing the pollen onto the back of the pollinator. |
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Try substituting eyeglasses for your contact lenses when the pollen count is high. |
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Commonly used agents include African plum, South African star grass, stinging nettle, and rye pollen. |
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Species within the Proteaceae utilize a variety of animal vectors to disperse pollen. |
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The pollen grain is a three-celled structure composed of two generative cells encased within the vegetative cell. |
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Expression was also detected in vascular tissues, leaf veins, siliques, and in pollen sacs. |
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Dried pollen and spores were then stored in glass vials at room temperature until required. |
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More than one half of the sphingids presented pollen from only one or two species of plants. |
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Enclosing bumblebees permits us to control the pollen parent, as well as the female parent. |
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Tiny insects can trigger an explosive opening of mature bunchberry flowers, and are showered with pollen as they fly away. |
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This pollen drift poses huge problems for any farmer trying to grow non-genetically engineered crops. |
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Pinaceae are Monoecious with small pollen cones and larger seed cones with spirally arranged scales. |
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Among other things, biological agents include bacteria, viruses, fungi, pollen, dust mites and moulds. |
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In only one pollination did a pollen tube appear to enter the ovary, but not the ovule. |
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For example, low temperatures near flowering affect ovule development and pollen tube growth. |
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In translocation heterozygotes of maize, segregation produces nonviable gametes and can be detected by a high frequency of nonstaining pollen. |
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In flowering plant pollen tubes, caffeine disrupts vesicle zonation at the tip and stops elongation. |
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Pollen organs have been described as anything from a modified leaf bearing stalked pollen sacs to cone-like clusters. |
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Artificial pollination was effected by brushing the recipient flower stigmas with stamens from the pollen donors. |
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She-oak, oak, or casuarina is a family of Australian native trees that produces large quantities of wind-blown pollen. |
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To achieve this, amino caproic acid was incorporated for the first time into the pollen germination medium. |
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Male sterile plants don't produce pollen, which makes it easier to breed improved hybrids and produce hybrid seed. |
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Cotton swabs were used to apply the pollen to receptive stigmas on a mother plant. |
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A given pollen grain blowing in the wind is thus unlikely to land on a receptive stigma. |
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Pollinations were performed in June by applying the cotton stick loaded with pollen on the receptive stigmas. |
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The grain is empty because the body cell and prothallial nuclei have moved out along the pollen tube towards the archegonia. |
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The type of pollen particle triggering hay fever is probably from trees, grasses or weeds. |
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The fragrance is intense and long stems are heavy with deep-orange pollen that stains if brushed against. |
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Immature female and male strobili cones were harvested from a 40-year-old Norway spruce tree, 2 weeks prior to pollen release. |
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Unlike most seed plants, however, the pollen and ovule-bearing organs are usually produced together in a bisporangiate strobilus called a flower. |
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This lower interval has already been analysed for pollen, diatoms, ostracods, and gastropods. |
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In addition, unlike most heterostylous species, the two floral morphs in Narcissus spp. do not differ in pollen size or pollen production. |
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As the pistil emerged from the bracts, the style elongated and the stigma expanded markedly in size and, finally, became receptive to pollen. |
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If both of the ovaries in a flower contained pollen tubes a mean value was used in the analyses. |
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Distal flowers are often smaller and produce fewer or smaller ovules, seeds and fruits, but they may have higher pollen production. |
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The number of pollen tubes and ovules in the ovaries of each of six dissected pistils from each cross is shown. |
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I was intrigued with how they gathered pollen and nectar from flowers to make honey. |
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Bee pollen consists of blended pollen grains collected by honeybees from a wide variety of plants. |
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It is thought that honeybees can gather nectar and pollen from Australian plants without pollinating the plants. |
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Above this level, palynological assemblages are dominated by circumpolles pollen of the taxon Classopollis. |
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Pollen traps also indicate that pollen is shed directly into the air, permitting wind pollination. |
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Some studies have shown that monarch larva die when fed Bt pollen, although other studies of swallowtail butterflies show little effect. |
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As the pollen presenters aged, the stigmatic papillae separated further forming a definite slit or groove. |
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In Florida, April is the cruelest month, dropping oak pollen onto the parched earth. |
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They are also synthesized during some developmental processes such as pollen or seed maturation. |
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Owing to the gradual dehiscence of the thecae, at any time, syrphids could only access part of the pollen of each anther. |
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Guidance of the pollen tube down the style involves mechanical, chemical and physical cues that are not yet fully understood. |
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As the females search for egg sites, they pollinate the flowers with pollen carried from the fig where they were born. |
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Butterflies, flies and small bees pollinate flowers less frequently, and deposit smaller pollen loads, than large bees. |
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Maize pollen was used as a control to pollinate wheat, using the method described previously by Inagaki. |
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In other Magnolia species predominantly pollinated by beetles, pollen shortage or inefficient pollination has been reported. |
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Pollination occurs when insects carrying pollinia visit another flower and deposit pollen on the stigma. |
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Unfortunately for hayfever sufferers, pollen is a natural pollutant of the air. |
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The rapid rates of migration of trees, evident in the pollen isopleths, remain unexplained. |
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She also has the ability to carry 2,000 to 3,000 pollen grains in her corbiculae. |
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To find out, the researchers established corn pollen density and distribution patterns on milkweed leaves near cornfields. |
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In the flowers, corolla, corona and anther structure are similar, but the shape of the pollen tetrads in the two genera is different. |
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Mechanisms that prevent selfing and its harmful effects and promote more proficient pollen dispersal have shaped much of floral evolution. |
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In flowering plants, pollen development represents a good model to study cell communication and signalling as well as cell elongation. |
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When the blowflies enter the flower, slanted spines prevent exit, and the flies are trapped overnight, spreading their pollen to the mature female florets inside the flower. |
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All feed primarily on plant material, either fruit, nectar or pollen. |
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Size and number of pollen grains were used as dependent variables, population as an independent variable, and the number of flower buds as a covariate. |
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Their diet consists of nectar, pollen, flowers, fruits and unripe grains. |
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A pollen count of more than 1,000 signals the Severe Discomfort Zone, when most ragweed allergy sufferers will probably have more severe symptoms. |
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Another type of apomictic development has been reported to occur in the gymnosperm Cupressus dupreziana, where embryos develop from unreduced pollen grains. |
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The microsporophyll of Lepidopteris has been reconstructed as a pinnate axis with short branches bearing clusters of small elongate pollen sacs fused at the base. |
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Avinoam Danin, a botanist from Hebrew University of Jerusalem claims he has identified pollen from the tumbleweed Gundelia tournefortii and a bean caper on the shroud. |
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A further complication has been the studies by palynologists, scientists who study spores and pollen, who use yet another system for naming the fossil species. |
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In a new twist on a miserable but familiar condition, part of the reason for this year's high pollen counts, some experts say, could be the foot and mouth crisis. |
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Two forms of pollen viability are apparent in entomophilous species. |
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While in the bloom, they mate, feed, and brush pollen onto female flowers. |
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There are extra dangers if the pollen count is high and sufferers take higher doses of their medication to relieve symptoms such as streaming eyes and sneezing. |
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One male date palm can produce enough pollen for 49 female trees. |
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Orbicules may be attached to the exine of the pollen grains. |
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The red, ripe fruit originated from pollination with pollen of H. undatus clones, while the green, unripe fruit was from pollination with S. grandiflorus pollen. |
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The pollen diameter was recorded in units with the aid of a micrometer placed in the eyepiece of the microscope and later transformed into millimeters. |
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Forecasters said the pollen count across Greater Manchester would be high today, between 50 and 149 grains of grass pollen per cubic metre of air. |
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The rest of the pollen mixture was pelleted by centrifugation. |
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The pollen grain is the male gametophytic phase of flowering plants. |
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Commonly, however, aerobiology is about pollen and spores in the air. |
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Growers are very dependent on the skill of the apiarists, who bring along hives full of bees just at the stage when they have need of lots of pollen to feed their brood. |
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The tapetum degenerates earlier than usual, resulting in high pollen sterility, and anther indehiscence occurs when pollen stainability falls below 20 percent. |
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Using the negative exponential model of pollen dispersal, one can enumerate the cumulative reproductive success expected at increasing intermate distances. |
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People are most at risk from hay fever when the pollen count is high. |
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The first component of m is the number of eggs that alpha could have provisioned with pollen reallocated from destroyed beta larvae with unconsumed pollen. |
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The change in colour from cream-coloured to amber, and the change in shape from a prolate spheroid to an indented, prismatic solid, is typical for corn pollen during drying. |
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What probably happened is that a light frost killed the pollen in the male stamen at a temperature just below freezing, but leaving the female receptive. |
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The fine sand and silt size fraction comprised decayed plant material, pollen, occasional chitin fragments, clay aggregates, diatoms and fine silicates. |
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Examples of carbonizing herbs to stop bleeding are carbonized cattail pollen, carbonized human hair, carbonized agrimony and carbonized wormwood or mugwort. |
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Gish did not identify any wild rice, maize, or cucurbit pollen. |
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Nectar is the most common reward amongst epidendroid orchids since their pollen occurs in discrete masses within pollinia and is generally inaccessible to foraging insects. |
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Plants grown from teosinte seeds were pollinated with maize pollen. |
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Moreover, the high loads of inviable or weak aneuploid pollen produced by triploids induce high selfing rates in normally self-incompatible sexual diploids. |
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The genus is characterized by tetramerous flowers with bithecal anthers, lack of pseudostaminodia, a capitate or poorly defined stigma, and pollen of the Amaranthus type. |
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Some varieties shed pollen from the male catkins before the female flowers are receptive, and so require pollen from another variety with a later pollen maturation date. |
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Honey bees leaving the dispenser-fitted hive did wade through the pollen, but they readily started packing the pollen clinging to their body into their corbiculae. |
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She's loading pollen onto her corbiculae, hair-rimmed, basket-like structures on her back legs that hold the bright grains for transport to her colony. |
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Variable preservation suggests that some of the pollen may have been redeposited, possibly by water percolating through layers during summer melting. |
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Another theory is that genetic modification may be creating pollen with less nutritional value. |
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It's this invasion of pollen that brings on serious allergies. |
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It is a beautiful white lily flower with big buds of pollen in its centre. |
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Around most fields, three and six metre margins and areas seeded with special wildflower or pollen mixes provide food for invertebrates and birds. |
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All species studied are monandrous orchids, therefore the number of pollen presented in the Table 2 corresponds to the number of pollen grains per flower. |
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Hay fever symptoms are likely to be worse if the pollen count is high. |
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In this study, the extent of reduction in seed production due to insufficient pollen quantity and quality were examined in a naturally pollinated M. stellata population. |
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Only one pollen tube tip entered the nucellus through the micropyle. |
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The next day, the male florets mature, the flies pick up more pollen, the spines wither, and the flies are released to spread their pollen to other nefarious arums. |
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Within the ovary, pollen tubes also grew in the ECM to penetrate the micropyle and subsequently grew intercellularly within the nucellus up to the embryo sac. |
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No differences were noted in pollen germination, pollen tube growth or fertilization between experimental tests of xenogamy and geitonogamy in S. mucugensis. |
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I have horrible allergies when the cottonweed pollen is out. |
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Besides, the cone was probably not exposed to pollen of other lacebarks and the seeds were probably empty or defective, as pines don't do self-pollination well. |
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By employing pollen analysis, scientists have been able to reconstruct past vegetational communities and analyse how those vegetation patterns have changed over time. |
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In pre-zygotic mechanisms, the pollen tube may grow as far as the ovule but not penetrate it, or penetration may be achieved without fertilization. |
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Check your local weather report for the pollen count in your area. |
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In this population, the male cyathia produced on average 100 pollen grains more per stamen than the hermaphrodites, but this difference was not significant. |
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During this period, the species feeds on the nectar and pollen of flowering saguaros and organ pipe cactus, contributing to the successful pollination of these succulents. |
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Bourg's experimental results have shown that flowers that receive pollen from other plants are more fruitful than those fertilized by their own pollen. |
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