Genetic analysis of sterility caused by anther indehiscence gene linked with a semidwarfing gene locus, sd1 in rice [Oryza sativa]
2008
Irie, K.(Tokyo Univ. of Agriculture (Japan). Faculty of International Agriculture and Food Studies) | Hua, C. | Tun Y.T. | Fujimaki, H. | Kikuchi, F. | Nagamine, T.
Rice cultivar Reimei, an artificial mutant of Fujiminori, is known to harbor a semidwarfing allele sd1-r on the chromosome 1. The semidwarfing gene was transferred to the genome of Norin 29 by nine repeated backcrosses to develop an isogenic line SCReimei. This isogenic line was crossed with Norin 29 (recurrent parent) to make an Fsub(2) hybrid population, in which a number of sterile plants segregated. Close observation disclosed that the seed sterility was not caused by pollen sterility but by anther indehiscence. Segregations of the sterility were investigated in an Fsub(2) population revealing that the anther indehiscence was affected by a single recessive gene. Since sterile plants tended to be semidwarf, independence between sterility and semidwarfness was statistically tested to ascertain association between them. The results suggested that genes affecting both characters were linked on the chromosome 1. Taking into account that pollens and seeds of both parents were fully fertile and no sterile plants were observed in an Fsub(2) population of Norin29/SCReimei, anther indehiscence affecting seed sterility seemed to be caused by a mutation arisen in Fsub(1) plants of SCReimei/Norin29. The investigation of internode elongation of sterile plants suggested that the gene affecting anther indehiscence had a pleiotropic effect to inhibit the upper internode elongation of culm.
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