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三、抗性的遗传 对品种抗性遗传的研究,不仅能为当前的抗性育种提供科学依据,也是解决害虫“生物型”问题的钥匙。国际水稻所1971年开始研究品种对褐稻虱抗性的遗传,发现Mudgo、Co22的抗性由一对显性基因所控制,而ASD7的抗性则由一对隐性基因所控制。这些基因分别被定为Bph,和bph_2,二者紧密连锁,从未发现有重组现象。以后又发现一对控制品种RathuHeenati抗性的显性基因与Bph_1独立分离,被定为Bph_3。控制品种Babawee的抗性是另一个与bph_2独立分离的隐性基因,这一基因被定为bph_4,随后还发现Bph_3和bph_4也是连锁的。Ptb21和Ptb33各有一对未知的显性抗虫基因和一对隐性抗虫基因。
Third, the resistance of genetic Inheritance of resistance to genetic research, not only for the current breeding provide a scientific basis for resistance, but also solve the pest “biological” problem key. The International Rice Research Institute began to study the inheritance of resistance to brown planthopper (BPH) in 1971. It was found that the resistance of Mudgo and Co22 is controlled by a pair of dominant genes, while the resistance of ASD7 is controlled by a pair of recessive genes. These genes were identified as Bph, and bph_2, the two are closely linked, never found a recombination phenomenon. Later found a dominant gene RathuHeenati resistance control gene and Bph_1 isolated independently, was identified as Bph_3. The resistance of the control species Babawee, another recessive gene isolated independently from bph_2, was identified as bph_4, followed by the finding that Bph_3 and bph_4 are also linked. Ptb21 and Ptb33 each have a pair of unknown dominant insect-resistant genes and a pair of recessive insect-resistant genes.