绵枣儿大小孢子的发生和雌雄配子体发育研究

用常规石蜡切片法和光学显微技术研究绵枣儿的花芽分化、大小孢子发生和雌雄配子体发育过程。结果表明:绵枣儿的花为两性花,每朵花具有雄蕊6枚,花药4室,花药壁由表皮、药室内壁、中层(2层)、绒毡层共5层细胞构成,其发育方式为双子叶型,绒毡层为腺质绒毡层类型;小孢子母细胞减数分裂的胞质分裂方式为连续型,产生的四分体包括左右对称型与四面体型2种,成熟的绵枣儿花粉为二细胞型花粉;子房为3心皮3室,中轴胎座,倒生胚珠,厚珠心,双珠被;胚囊的发育方式为英地百合型,成熟胚囊为7胞8核。

Research on the genesis of megaspore and microspore inBarnardia japonica and the development of its gametophytes

In order to enrich the contents of embryology research onBarnardia japonica, the megasporogenesis, microsporogenesis and development of female and male gametophytes were studied by means of paraffin-embedded sectioning technique. The results show that each floret of inflorescence usually has six stamens, and each anther has four chambers.The development of the anther wall, which is formed by epidermis, endothecium, tapetum and two middle layers, belongs to a dicotyledonous type, and the tapetum is glandular type. Microspore cytokinesis of mother cell is continuously split twice and resulted in medianly zygomorphic tetrad and tetrahedral tetrad. Mature pollen grain is 2-cell type. The pistil ofBarnardiajaponicais consisted of three carpels, and the ovary has three locules. Ovules are anatropous on axile placenta, bitegminous and crassinucellate. The development of embryo sac isclassified as endymiontype, and the mature embryo sac has seven cells and eight nuclei.