Cytological and genetic studies of sterility in rice
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Date
1970
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Abstract
The nature of sterility in four lines of rice, G2254 (an off type found in a field of the standard rice variety Belle Patna), G2250 (a rogue from a field of fertile rice), G2266 (obtained by hybridization between the varieties Bluebonnet 50 and Gulfrose followed by selfing for six generations) and G2259 (derived by intervarietal hybridization followed by selfing for three generations) was studied cytologically and genetically. The varieties Nato and Bluebelle were used as the fertile control parents in this study. Cytological observation of the pollen mother cells in line G2254 revealed a characteristic poor synapsis between homologous chromosomes, resulting in the occurrence of a variable number of bivalents and univalents at diakinesis and metaphase I and lagging of chromosomes at anaphase I. The mature pollen grains appeared aborted and anthers never dehisced. Line G2254 failed to produce seed upon selfing, and by reciprocal crosses with fertile control plants. Asynapsis might be involved in megasporogenesis as well as in microsporogenesis in this sterile line. ...
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Major plant breeding