【摘要】 <正> 我国两系杂交水稻是否能成功地在生产上推广应用在很大程度上决定于是否能培育出育性稳定和育性转换期明显的两用核雄性不育系。从我国已通过省级以上正式鉴定的水稻两用核雄性不育系的育性表现来看,几乎没有一个具有较大的实用价值。近年来的育种实践表明,在雄性不育期内育性相当稳定,很难发生育性波动的核不育材料在秋季的育性转换时间往往较迟,自交结实率不高或难以获得自交种子,而在秋季条件下雄性恢复时间较早,自交结实率较高的一些核雄性不育材料在雄性不育期的育性容易发生波动,败育不彻底。由此可见,解决水稻核雄性不育系的育性稳定性与自交结实率的矛盾正是两系杂交水稻育种工作的当务更多还原

【Abstract】 The experimental result showed that FR₁, a new fertile regulator, had obvious effect on the fertility change of CIS28-10 and Pei’ai 64S, but no effect to V20A. The effect of 200 mg/ kg FR₁ was best. The panicle development stage most sensitive to the regulator was on the reduction division stage of pollen mother cell and the effect of the regulator in autumn was more obvious than in summer. It suggested that FR₁ might be used to change the genetic male-sterile materials into fertile one so that more self-fertilized seeds could been obtained. which may be a new pathway for utilization of genetic male-sterile rice.更多还原