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本文就我国各地推广的8个杂交稻组合,对强、中、弱三种致病力的白叶枯病菌系的抗性,进行遗传动态方面的分析。研究表明,大多数组合的杂交稻(F_1)抗性介于双亲之间,并偏向抗性水平较高的亲本。这些杂交稻的抗性与中亲值有显著相关,可按中亲值预测杂交稻的感病度。通过相对抗病优势的计算得知,杂交稻对白叶枯病的抗性,部分显性是主要的。8个组合中,汕优6号,威优6号两组合对强致病力的茵系 KS-6-6的抗性主要为一对显性主效基因控制,同时有微效基因的修饰作用。这个显性抗性基因来自 IR26。这2个组合对 KS-8-4和 KS-1-2以及其余6个组合对所有3个菌系的抗性均表现为多基因控制的数量性状。
In this paper, 8 hybrid rice combinations popularized in different parts of China were used to analyze the genetic dynamics of the resistant strains of three bacterial blight strains with strong, moderate and weak pathogenicity. Studies have shown that the majority of combinations of hybrid rice (F 1) resistance between the parents, and biased toward the higher resistance of the parent. The resistance of these hybrid rice was significantly correlated with the pro-parent value, and the susceptibility of the hybrid rice could be predicted by the pro-parent value. The resistance of the hybrid rice to bacterial blight was mainly determined by the relative resistance advantage calculation. Among the eight combinations, the resistance of the two combinations of Shanyou 6 and Weiyou 6 to virulent virulent KS-6-6 was mainly controlled by a pair of dominant major gene, and there were minor gene modification effect. This dominant resistance gene is from IR26. The resistance of these 2 combinations to all 3 strains of KS-8-4 and KS-1-2 and the remaining 6 combinations all exhibited quantitative traits for multigene control.