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1“两系”稻制种特点“两系”杂交稻制种,其不育系受育性基因控制,即在一定温光条件下表现可育或不育。制种工作就是在其稳定不育时段进行。所以,“两系”制种技术的实质是建立在“三系”制种技术基础上的。所不同的是,“三系”不育系是稳定不育,在任何时间和地点均表现为雄性不育,而“两系”不育系其育性不稳定,随
1 “Two lines” characteristics of rice seed production “Two lines” hybrid rice, its sterile line fertility gene control, that is, under certain temperature and light conditions, the performance of fertile or sterile. Seed production is in its stable period of infertility. Therefore, the essence of the “two lines” seed production technology is based on the “three lines” seed production technology. The difference is that the “three lines” sterile lines are sterile, male sterile at any time and place, while the “two lines” CMS are not fertile