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“两系:杂交水稻制种中,不育系自交结实的原因及预防自交结实的措施有哪些?

问答题
2022-06-02 23:00
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正确答案

(1)不育系自交结实的原因
①育性敏感期内遇到连续低温(日均温低于不育起点温度),导致不育系恢复可育结实
②制种后期高位分蘖遇短日低温自交结实
(2)预防自交结实的措施
①将扬花期尽可能安排在育性稳定期的前期
②如果育性敏感期内遇连续低温(低于23.5℃),可化学杀雄
③要高标准培育“早、匀、齐”的壮秧
④适时收割,防止高位分蘖自交结实谷粒灌浆成熟


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