翅果油树大小孢子发生及雌雄配子体发育

利用常规石蜡切片技术,对濒危植物翅果油树大、小孢子发生及雌、雄配子体发育的过程进行研究,探讨在其发育过程中是否存在生殖障碍。结果表明:翅果油树花药四囊型,花药壁由表皮、药室内壁、2层中层、绒毡层5层细胞组成,绒毡层为腺质型;小孢子母细胞减数分裂过程中的胞质分裂方式为同时型,小孢子四分体排列方式为四面体型,有时为交叉型或左右对称型;成熟花粉粒为2-细胞型,有3个萌发孔;子房上位,基生胎座,倒生胚珠,双珠被,厚珠心;胚囊发育属于蓼型。其雌、雄配子体发育过程多数正常。

Megasporogenesis, Microsporogenesis and Development of Gametophytes of Elaeagnus mollis

This paper reported the microsporogenesis, megasporogenesis, and development of the male and female gametophyte of Elaeagnus mollis observed by paraffin section technique to test whether there is any obstacle of reproduction in the process of sex reproduction. The results showed: 1) The wall of anther consisted of five layers: epidermis, endothecium, two middle layers and tapetum from surface to inside, and the tapetum was secretory type. 2) Cytokinesis during meiosis of the microspore mother cell was simultaneous type, and tetrads were tetrahedral, and occasionally decussate or isobilateral. 3) Mature pollen grain was 2-cell type with three germ pores. 4) The flower of Elaeagnus mollis was hypogynous flower. Ovules occurred at basal placentation. The ovule was anatropous, bitegmic and crassinucellate. 5) The embryo sac was of Polygonum type. The development of the most male and female gametophyte was normal.