水稻感光性和光敏不育性的发育遗传关系

在人工气候室控制的光长与温度下,用光敏不育系7001S与早中熟粳稻(Oryza sativa ssp,japoni-ca)感光性弱的“秋光”、“有芒早粳”和“CPSLO-l7”3个品种分别杂交,分析了杂种F_1、F_2植株育性与感光性的表现,以及两者的关系。结果表明:这3个组合的恢复亲本均属于具两对光敏不育的恢复基因的品种。F_1植株均倾向晚熟亲本,说明控制感光性强的基因属于显性。F_2植株在长日照下表现为不育株的感光性均倾向感光性强的亲本;且有不少不育株为晚熟超亲;在少数弱感光性的植株中没有不育株。说明光敏不育基因与感光性基因关系密切,可能两者有连锁关系,光敏不育基因要在感光性基因表达的基础上才能表达。

RELATIONSHIP BETWEEN THE RICE HEADING SENSITIVITY AND THE MALE-STERILE SENSITIVITY TO PHOTOPERIOD IN VIEW OF DEVELOPMENTAL GENETICS

One photoperiod-sensitive genie male-sterile (PGMS) rice and three regular rice (Oryza sativa ssp. japoruca) cultivars have been used for hybrid combinations. In order to analyse the relation between the heading sensitivity and the male-sterile sensitivity of photoperiod in FI and F2 progenies, the expreiments were carried out in a controlled environment-the phytotron. The results showed that these three restorers had 2 pairs of restorer genes for the photoperiod sensitive male-sterile rice. And the heading sensitivity to photoperiod of F1 tended to late mature PGMS rice (7001S) . It was also indicated that the strong response was dominant over the weak response to photoperiod in both F1 and F2 generations. As the fertility segregations, the F2 progenies from those of male-sterile rice x regular rice crosses produced clear-cut segregation for both kinds. The F2 data showed that photoperiod-sensitive male-sterility is controlled by two recessive genes, producing F2 ratio of 15:1. And the sterile plants in F2 generations, which were cultured in long day condition, are attributed to stronger response to photoperiod. No sterile plant could be found in weak response progenies. Using such experimental approach, the authors predicted that the heading sensitivity and the male-sterile sensitivity of photoperiod are closely related, and not independently inherited. These results also suggested that the photoperiod sensitive male-sterile gene might be expressed on the basis of the ex- pression of the photoperiod sensitive alleles.