| Abstract: | During meiosis of the microsporocyte of Ginkgo biloba L., the nucleoids, after going through a serios of regular dynamic changes, had primarily established an axial polarity from the proximal face to the distal face of the cell. In the consequent germination, the microspore went through three consecutive polar periclinal mitotic divisions, which may be considered as further intensifying the primary polarity. In terms of structural change, lacking of plasmodesmas in the walls between the daughter cells, may set forth in isolating all the daughter cells in which fine differentiation took place. The anticlinal ring-like division observed in the generative cell might play an important role in polarity regulation in the male gametophyte, eventually leading to the anticlinal division in the spennatogenous cell to produce two back-to-back positioned spermatozoids. |
