广西蜘蛛抱蛋的大小孢子发生和雌雄配子体发育

Mega-microsporogenesis and the development of female-male gametophyte in Aspidistra retusa

关键词:  广西蜘蛛抱蛋  大孢子  小孢子  雌配子体  雄配子体

Key words:  Aspidistra retusa  megaspore  microspore  female gametophyte  male gametophyte

摘要:

对广西蜘蛛抱蛋的花做常规石蜡切片并进行观察后发现:广西蜘蛛抱蛋的花药4室,绒毡层腺质型,发育后期出现双核及多核细胞。小孢子四分体左右对称型,偶见四面体型,胞质分裂连续型。成熟花粉为2细胞。子房3室,中轴胎座。胚珠倒生,双珠被,厚珠心型。珠孔由内珠被形成。胚囊发育为变异的蓼型。

Abstract:

After making a routine paraffin section on the flower of Aspidistra retusa,it was found that the anther was 4-sporangiate and glandular tapetum,and became binucleate or multinucleate at the later stage of its development. The microsporocyte underwent meiosis and the cytokinesis was successive which resulted in the formation of isobilateral and occasionally tetrahedral tetrads. The mature pollen grains were 2-celled type. The ovary was trilocular with axile placentation and the ovule was anatropous,biteguminous and crassinucellate. The micropyle was formed by the inner integument. The development of embryo sac was mutant Polygonum type.