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以套袋自交结实率为主要指标,观察分析了农垦58S与不同生态型的9个粳稻品种杂交的F_1 、F_2、BF_1代的育性,同时记载抽穗期。结果表明,农垦58S光敏雄性不育性由两对隐性主基因控制;这两对基因在不同类型的粳稻品种中其互作方式表现差异,即在早、中稻品种中表现积加作用(1:6:9),在晚稻品种中为独立分离(1:3:3:9),在农垦58品种本身的背景中表现隐性上位作用(4:3:9); 这种相互作用方式差异与分离世代植株的抽穗期有一定关系。农垦58S光敏不育性在不同的遗传背景中都能表达,但受到光、温两组微效基因修饰。本文提出“重复基因位点平行突变假说”,可以较完满地解释农垦58S的遗传机制;同时就光敏感雄性不育系的遗传分类和选育温光弱感型光敏雄性不育两用系,提出了讨论。
Taking bagging selfing rate as the main index, the fertility of F_1, F_2 and BF_1 hybrids of Nongken 58S and 9 japonica rice varieties with different ecotypes were observed and analyzed. The heading date was also recorded. The results showed that Nongken 58S photoperiod male sterility was controlled by two pairs of recessive major genes. The interaction between these two genes in different types of japonica rice was different : 6: 9), independently segregating in late rice varieties (1: 3: 3: 9), showed a recessive epicenter in the background of Nongken 58 variety itself (4: 3: 9) There is a certain relationship with the heading date of isolated plants. Nongken 58S photoperiod sterility in different genetic backgrounds can be expressed, but by light and warm two groups of micro-gene modification. In this paper, the hypothesis of parallel mutation of repeated loci was proposed to explain the genetic mechanism of Nongken 58S more satisfactorily. In the meantime, the genetic classification of light sensitive male sterile lines and the selection of temperature sensitive and light sensitive male sterile lines, Put forward the discussion.