摘要
本文采用常规石蜡切片法，在光学水平上观察了糜子（ＰａｎｉｃｕｍｍｄｉａｃｅｕｍＬ．）大小孢子发生的细胞形态学过程。小孢子母细胞减数分裂时，胞质分裂为连续型，四分体有左右对称型、直线型和交叉型等多种排列方式。大多数绒毡层细胞随着减数分裂结束而退化，少数为腺质绒毡层。糜子为直生胚珠，双珠被、薄珠心。大孢子母细胞减数分裂后形成线性排列的４个大孢子，珠孔端或合．点端一个大孢子发育为功能大孢子，其余三个退化。不同的花药或同一花药不同的小孢子母细胞减数分裂同步，偶出现不同步。大孢子母细胞减数分裂迟于小孢子母细胞。
The cytomorphology of microsporogenesis and megasporogenesis in Panicum miliaceum L.was observed under light microscope,using the method of conventional paraffin sectioning.Cytokinesis was of successive type during meiotic division.The arrangement of microspores in a tetrad was isobilateral,linear and decussate.After meiosis the tapetum degenerated,in some cases,it's type is glandular tapetum. Ovules were orthotropous, bitegmic,tenuinucellate.Only one megaspore which was in chalaza or micropyle enlarged and functioned while the other three megaspores degenerated.The tempos of microspore mother cell in different anther and in the same anther were in most cases highly synchronized.The development of megaspore mother cell were slower than that of microspore mother cell.
出处
《西南农业学报》
CSCD
1996年第1期58-63,共6页
Southwest China Journal of Agricultural Sciences
关键词
糜子
大孢子发生
小孢子发生
减数分裂
Panicum miliaceum L.
Microsporogenesis
Megasperogenesis.
