Section 7
Chapter 6,507

Studies on cytoplasmic genetic male sterility of cultivated rice oryza sativa 2. morphological histological investigation on functional male sterility

Cheng, Y.K.; Huang, C.S.

Journal of Agricultural Research of China 29(2): 67-80


Accession: 006506137

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Anther indehiscence was the main cause of cytoplasmic-genetic male sterility for rice varieties 65 P 2, 61 P 1 and KR 7. This type of male sterility, determined by cytoplasm and not by nucleus, was stable in a range of temperatures. The most significant difference of indehiscent anthers from normal ones was their strongly thickened fibrous endothecium and their orientation pattern. The epidermal cells were also slightly thick-walled. The separation of intermicrosporangial stripe 1 (IMS 1) from the underlying parenchyma along each side of the connective tissue did not occur at anthesis. The outer surface of IMS 1 of indehiscent anther had some spurs or ridges, whereas the surface of normal anthers was smooth. It may prevent the formation of anterior pore in the anthers and pollen shedding. The anther wall structures and physical process of cohesion are probably involved in anther dehiscence. The possible use of male sterility in developing hybrid rice is discussed.

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