兩種柿屬之小孢子囊及雄配子體的發育

Microsporogenesis and the Development of Male Gametophyte in Two Species of Diospyros L.

本文研究柿屬之綠材柿（Diospyros chloroxylon Roxb.）及美國柿（D. virginiana L.）的小孢子囊及雄配子體的發育。花藥壁的發育屬雙子植物型，成熟時含有表皮組織，纖維狀外層組織（2～3層）及一單層之分泌型營養層，具單或雙核。結締營養層亦有分化。花粉母細胞之分裂為同調並產生四同體之四分孢子細胞質分裂為溝裂。花粉表面平滑，具三溝孔，由花藥釋出時為雙核，很少有三核。在美國柿常見有花粉退化的情形。

Development of the microsporangium, and the male gametophyte were studied in Diospyros chloroxylon Roxb. and D. virgiana L. The anther wall development is of the Dicotyledonous type and at maturity it consists of the epidermis, fibrous endothecium, 2-3 wall layers and a secretory tapetum which is uniseriate with uni- or binucleate cells. Connective tapetum is also differentiated. Pollen mother cells divide simultaneously and produce tetrahedral tetrads. Cytokinesis is by furrowing. Pollen grains are smooth, tricolporate and two celled at the time of liberation. Rarely 3-nucleate pollen grains are seen. Pollen degenerations are common in D. virginiana.