Fertility transformation and genetic behavior of Hubei photoperiod-sensitive genic male sterile rice

摘要

From 1982 to 1985 we studied the stability of fertility and the genetic behavior for Nong-Ken 58 of Hubei photoperiod-sensitive genic male sterile rice (HPGMR) (MSR58 A(B)). Under the daylength in Wuchang, HPGMR possesses a marked fertility-transformation character, which converts a male sterile line to male fertile. The critical period of fertility transformation is 1 or 2 Sep, i.e., the plant is male sterile if heading occurs before 1 or 2 Sep; male fertile if heading occurs after those dates. The pollen of the male sterile period resembles "typical aborted type" in the late monokaryotic stage: the rate of male steriles is 100% in the population; degree of male sterility is 99.8-100%. On the contrary, in the fertile stage, the percentage of fertile plants is 100%; the degree of spikelet fertility is 10-40%. Fertility transformation is not affected by seed storage or by planting in another region. The sterility of the sterile stage is stable,but the degree of fertility is unstable in the fertile stage. Degree of fertility varies by region, and in different years at the same place, and at different heading stages of the same fertility stage at the same location. HPGMR fertility is probably controlled by a pair of recessive major genes in the mesoplast, which are also modified by minor genes. Preliminary investigation indicates the potential of using the fertility genes of HPGMR in rice breeding.