华北驼绒藜大小孢子的发生及雌雄配子体发育过程的解剖学研究

运用石蜡切片技术对华北驼绒藜大、小孢子发生及雌、雄配子体的发育进行了研究.结果表明:(1)花药4室,花药壁由表皮、药室内壁、1~2层中层及1层绒毡层组成,药壁发育为基本型,腺质绒毡层,发育后期为二核或三核;(2)四分体胞质分裂为同时型,小孢子四分体多数为四面体型,偶见十字交叉型;(3)成熟花粉2-细胞型,单核小孢子时期存在不同比例的空壳花粉,从0%~80%不等;(4)胚珠倒生,双珠被,厚珠心,大孢子四分体直线型排列,合点端为功能大孢子,蓼型胚囊.

Megasporogenesis, Microsporogenesis and Development of Male and Female Gametophytes in Ceratoides arborescens

Traditional paraffin sectioning method was used to observe the development of megasporore,microsporore,male and female gametophytes.The result showed:(1)the anther has four chambers and the development of anther wall is elementary type,which is composed of epidermis,endothecium,has 1~2 middle layers and one tapetum layer.The tapetum belongs to glandular type;(2)The cytokinesis of microspore mother cell in meiosis is simuteneous,and most of the tetrad are tetrahedral,decussation is also observed;(3)Empty pollen grains are observed at the stage of haploid nuclear microspore;mature pollen grain is 2-cells;(4)Ovule is anatropous,bitegminous and crassinucellate,micropyle is formed by the inner integument.The megaspore mother cells undergo meiosis division to form a linear tetrad,and the chalazal megaspore is the functional one,the embryo sac is 'Polygonum type'.