光敏感核不育水稻农垦58S雄性不育性的遗传学研究

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,BCF_1代的抽穗期与育性。结果表明,农垦58S光敏雄性不育性由2对隐性主基因控制:这2对基因在不同类型的梗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,在晚稻品种中为独立分高,在农垦58品种本身的背景中表现隐性上位作用,这种相互作用方式差异与分离世代植株的出穗期限有一定关系;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2组微效基因修饰。“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。本文还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进行了讨论。

GENETICS OF PHOTOPERIOD SENSITIVE GENIC MALE STERILITY OF NONGKEN 58 S

Observation and analysis of the heading date and fertility of F_1,F_2 and BCF_1 descended from combinations (Nongken 58 S/nine japonica varie-ties)by using an indicator of bagged seed setting rate indicate that the photoperiodsensitive genie male-sterility (PSGM) of Nongken 58 S (Oryza sativa L.)is controlled by two pairs of recessive major genes and the interaction of the genesis performed differently in parental varieties. For example, there appeared additiveeffect in early and middle rice, independent segregation in late rice and recessiveepistasis in Nongken 58 itself. The difference in interacting patterns is somewhatrelated to the heading date of F_1 F_2 and BCF_1, The PSGM of Nongken 58 S, whichmight be modified by two set of minor genes called Photoperiod and thermoperiodcontrol genes, is expressed in various genetic background. To explain the geneticmechanism of such phenomena, a hypothesis of "parallel mutation of the duplica-tion gene loci" has been advanced and genetic classification and selection of doublefunction line of PSGM slight response to photoperiod and thermoperiod arediscussed.