| Within species that show latitudinal variation in both thermal and photoperiodic response, that of photoperiodic response tracks the climatic gradient more closely. |
| It was assumed that factors that are under photoperiodic control would show a clinal order among the ecotypes. |
| Under natural photoperiodic conditions protandry in hermaphrodite disc flowers of sunflower is determined by the different elongation rates of the style and filaments. |
| Leaves communicate photoperiodic signals to meristems, stolons and buds in flowering, tuberization and dormancy. |
| Poinsettias are photoperiodic which means flowering is initiated by a change in day length. |
| A photoperiodic response in gonadectomized Japanese quail exposed to a single long day. |
