美国水稻品种对稻瘟病小种IE-1k、IB-33、IB-49和IC-17的抗性遗传

1994年10月至1995年5月，在美国阿肯色大学水稻研究推广中心的温室，对5个美国水稻品种Katy、Lemont、L202、RA73和Bond、其F1、F2和部分组合的F3随机选系，用4个主要美国稻瘟病菌小种IE-1k、IB-33、IB-49和IC-17进行接种鉴定，通过完全双列杂交进行遗传分析的研究。结果表明：所有的亲本对IB-33感病；除RA73外，其他亲本对IE

Inheritance of Resistance in Rice Cultivars of USA to Pyricularia grisea Races IE-1k,IB-33,IB-49,and IC-17

A complete set of diallel crosses were made among 5 USA rice cultivars of RA73, Katy, Lemont, L202 and Bond to identify the inheritance of rice blast (Pyricularia grisea) resistance to the races of IE-1k, I-33, IB-49 and IC-17. Parents, F 1, F 2 and some random selected F 2-derived lines from the F 3 were tested in the greenhouse at Stuttgart, Arkansas of USA during October 1994 to May 1995. The results showed that all parents were susceptible to race IB-33, all parents except RA73 were susceptible to race IE-1k, and all parents except Katy were susceptible to races IB-49 and IC-17. The inheritance of resistance to race IE-1k was controlled by two dominate complementary genes in the crosses involving parent RA73, to race IB-33 by two non-allelic susceptible genes in the cross between Lemont and L202, showing two dominant complementary resistance genes in their original wild-types and their progenies of the cross; there were two independent and dominant resistance gene loci to IB-49 or IC-17 in the crosses involving resistant parent Katy except one single resistant and dominant gene locus inheritance in the crosses RA73/Katy and Katy/RA73 to IB-49; and the F 2 progenies were all susceptible to race IE-1k from the crosses among susceptible parents of Lemont, L202, Katy and Bond; to race IB-33 from the crosses among susceptible parents of RA73, Katy and Bond, and to races IB-49 and IC-17 from the crosses among susceptible parents of RA73, Lemont, L202 and Bond, indicating the absence of complementary resistance genes in these parents to corresponding 4 races and probable allele of the susceptible genes in these parents.