光敏感核不育水稻农垦58S雄性不育性的遗传学研究(英文)

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。

Genetics of Photoperiod Sensitive Genic Male Sterility of Nongken 58S (Oryza sativa)

It has been demonstrated from the experimental observation and analysis on the heading date and fertility of F_1, F_2 and BF_1 descended from combinations Nong ken 58S (NK58S) / nine japonica varieties by using an indicator of bagged seed setting rate that the photoperiod sensitive genic male-sterility of Nongken58S (PSGM NK58S) is controlled by two pairs of recessive major genes and the interaction of those genes is performed differently from parental varieties. For example, the additive effect is appeared in early-maturing and middle season variety (1: 6: 9), the independent segregation in late maturing variety (1: 3: 3: 9) and the recessive epistasis in NK 58 itself (4: 3: 9). The difference in the interacting pat- terns is somewhat related to the heading date of F_1, F_2 and BF_1 The PSGM NK58S, which might be modified by two set of minor genes called photoperiod and thermoperiod control genes, is expressed in va- rious genetic background. To explain the genetic mechanism of such phenomena, a hypothesis of paralled mutation on the duplicate gene loci was advanced and genetic classification and selection of double-func- tioned line of PSGM slightly response to photoperiod and thermoperiod were discussed.