“Topaz is a variety of canola exhibiting a high frequency of embryogenesis in isolated microspore cultures.”

“The tapetal tissue has a secretory role providing essential nutrients required for microspore and pollen grain development.”

“The polarity of the micro-gametophyte of flowering plants is related to the proximal-distal axis of the microspore from which it develops.”

“Sterile plants produce microspores aborted in tetrads, no visible pollen shed, and parthenocarpic pods bearing no seeds.”

“They have male spores called microspores and female spores called megaspores.”

“The number of microspores produced is very large, but only four megaspores are borne in each megasporangium.”