文献类型： 外文期刊

作者： Shi, Shengli ¹ ; Ding, Ding ¹ ; Mei, Shiyong ² ; Wang, Jianbo ¹ ;

作者机构： 1.Wuhan Univ, Coll Life Sci, Key Lab MOE Plant Dev Biol, Wuhan 430072, Peoples R China

2.Hubei Acad Agr Sci, Wuhan 430064, Peoples R China

关键词： Radish (Raphanus sativus L.);CMS;Pollen development;Tapetum;Ultrastructure;Vacuolation

期刊名称：PROTOPLASMA （ 影响因子：3.356； 五年影响因子：3.298 ）

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收录情况： SCI

摘要： To gain further insight into the abortive stages and ultrastructural changes leading to pollen degeneration of a novel cytoplasmic male sterile radish 805A, we compared differences of cellular and subcellular structure of sterile anther with fertile anther by light and electron microscopy analysis. Two types of locule degeneration in sterile anther were detected, of which the time of degeneration occurred and completed was different. In type I, abnormality of pollen mother cells (PMCs) and tapetal cells, including condensation of cytoplasm and large vacuoles within tapetal cells, was shown at PMC stage. In type II, meiosis and early tetrad stage progressed normally except for large vacuoles that appeared in tapetal cells. Ultrastructural alterations of the cellular organization were observed in the type II locules, such as chromatin condensation at the periphery of the nucleus and degeneration of the karyotheca, compared with normal pollen development. The results suggested that the cytoplasmic male sterility anther degeneration was probably caused by dysfunctions of tapetum and vacuolation of tapetum, PMCs, and microspores. Thus, the identical factors, which induced CMS in the same cytoplasmic and nuclear genetic background, might affect development of tapetum and microspore at different stages during the cytoplasmic male sterile 805A anther development.