籼稻DV85衍生系抗白叶枯病基因的遗传分析

应用粳型广亲和系Ｍ５０３与籼型白叶枯病原始抗源ＤＶ８５杂交，杂种Ｆ２代选择偏粳型的抗性植株进行花培，仅用二年半时间充成的粳稻衍生素系ＺＤ９２１４７和籼稻衍生系ＺＤ９２１５２与感病品种沈农１０３３、成株期抗白叶枯病的ＣＢＢ２、ＣＢＢ４杂交，其杂种后代用致病力较强的白叶枯病菌株９３－１在苗期接种，经遗传分析认为它们均带有一对隐性的Ｘａ－５全生育期白叶枯病抗性基因，从而进一步证实作者提出的籼粳稻间转育白

Inheritance of resistance to bacterial blight in DV857 s derived rice lines

A rice (Oryzae sativa L)-indica bacterial blight (BB) resistant resource DV85 was crossed with japonica wide compatiblity variety M503, and it' s F2 resistant japonica-biased plants were selected in the field to be extracted anther for in vitro culture. A jdponica derived line ZD92147 and an indica derived line ZD92152 were breeded by the method in two and a half year. These two lines were crossed with a BB susceptible variety Shennong 1033. CBB3 and CBB4 which have BB adult resistant genes Xa-3 or Xa-4. Their hybrid progenies were innoculated by a stronger BB pathogen 93-1 in seedling stage and the results showde that the resistant genes of the two derived lines were all controlled by a recessive gene Xa-5 which expressed resistance in all the rice growing stage. This also indicates anther cultural technique is a more rapid and efficient way to transfer BB resistant genes in wide crosses.