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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、L2 0 2、RA73和Bond ,及其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 4 9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 1k感病 ;除Katy外 ,其他亲本对IB 4 9和IC 17感病。对稻瘟病菌小种IE 1k ,抗病亲本RA73与其他感病亲本组配的组合的F1表现抗病 ,F2 呈 9R∶7S的比例 ,表明RA73的抗性由 2对显性互补基因控制。对病菌小种IB 33,感病亲本Lemont与同样感病的亲本L2 0 2的F1表现抗病 ,F2 呈 9R∶7S的抗、感比例 ,表明这 2个亲本感病基因不等位 ,它们的原始品种和部分后代中存在 2对显性互补抗病基因 ,各有 1对抗性基因分别位于感病亲本Lemont和L2 0 2中 ,这 2个显性互补抗病基因同时存在时 ,才表现出抗病性。对病菌小种IB 4 9和IC 17,除抗病品种Katy与RA73组配的组合F2 对IB 4 9呈 3R∶1S的抗、感比例 ,表现为 1对显性基因遗传外 ,抗病品种Katy与其他亲本杂交 ,F2 呈 15R∶1S的抗、感比例 ,表现为 2对独立的显性抗病基因遗传。感病亲本Lemont、L2 0 2、Katy和Bond对小种IE 1k ,感病亲本RA
From October 1994 to May 1995, five American rice cultivars, Katy, Lemont, L2 0 2, RA73 and Bond, and their F1, F2 and partial combinations of F3 were randomized in a greenhouse in the Rice Research and Extension Center of the University of Arkansas The selected lines were identified by inoculation with 4 major U.S. M. sclerotiorum IE 1k, IB 33, IB 4 9 and IC 17, and genetic analysis was studied by complete diallel cross. The results showed that all the parents were susceptible to IB 33; other parents were susceptible to IE 1k except for RA73; other parents were susceptible to IB 4 9 and IC 17 except Katy. F1 showed resistance to the combination of IE 1k, the resistant parents RA73 and other susceptible parents, and the F2 showed a ratio of 9R: 7S, indicating that the resistance of RA73 was controlled by two pairs of dominant complementary genes . Resistance to F1 in pathogen race IB 33, susceptible parent Lemont and similarly susceptible parent L2 0 2, F2 showed an anti-sense ratio of 9R: 7S, indicating that the two parental susceptible genes were not allelic and that they Of the original breeds and some of the offspring, there were two pairs of dominant complementary disease resistance genes, one for each of the resistance genes located in the susceptible parents Lemont and L2 0 2, the two dominant complementary resistance genes coexist Out of disease resistance. The combinations F2 of the resistant race strains Katy and RA73 against IB 4 9 and IC 17 germplasm showed an anti-sense ratio of 3R:1 to IB 4 9, which showed a combination of dominant and resistant genes Katy crossed with other parents, and F2 showed an anti-sense ratio of 15R: 1S, which showed that two pairs of independent dominant resistance genes were inherited. The susceptible parents Lemont, L2 0 2, Katy and Bond showed accession to race IE 1k and susceptible parent RA