籼稻雄性不育保持性的差异及其遗传

Difference of the Maintenance of Male Sterility of CMS in Indica RiceM and Its Inheritance

以若干常规早籼稻品种 (系 )和 3种CMS不育系 (珍汕 97A、协青早A、II 32A)为材料 ,研究了籼稻雄性不育保持性的遗传。结果表明 ,不同保持系对 3种CMS不育性保持力有差异 ,保持系对不育性的保持力随回交次数递增而明显增强 ,保持不育的临界期发生在BC5 6代 ;轮回亲本选择对后代的育性分布有明显影响。

The inheritance of the sterility maintenance ability was studied for three types of CMS lines (Zhenshan97A, XieqingzaoA and II 32A) and several lines in indica rice. The result showed that different maintainer lines keep different abilities in three types of CMS lines to sterility. The ability to keep the sterility of CMS lines strengthened obviously with the increase of backcrossing number of times progressively. The critical stage to maintain the sterility of CMS lines happened usually in BC 5 6 generation. The selection of the recurrent parent gave on obvious influence on the pollen fertility distribution of the later generations. The author has discussed ways of improveing of the maintainer lines.