Studies of microsporogenesis and male gametophyte formation of Michelia guangxiensis
Microsporogenesis and male gametophyte formation of Michelia guangxiensis were first observed in this paper. Anthers are tetrasporangiate and anther wall is composed of epidermis, fibrous endothecium, middle layer(3-5 layers)and tapetum(1-2 layers). The tapetum is of glandular type with 2 or more nucleus,which degenerate and finally disappear when the pollens are mature. Cytokinesis in meiosis is modified simultaneous type, resulting in decussate,isobilateral or T-shaped(rarely)tetrads. Pollen is monocolpate and sheds at the 2-cell stage. Among the 200samples,the microspore mother cells in 30 ％ anthers degenerate before meiosis and the microspores in 40 ％ anthers degenerate seriously. The highest pollen germination rate is 25％ only.
国家科技期刊平台
NSTL
万方数据
维普
