云南水稻品种冬糯的白叶枯病抗性基因定位研究——Ⅰ.抗病基因的初级三体分析定位

Studies of the Location of Gene for Resistance to Bacterial Blight in Yunnan Rice Variety Dongnuo Ⅰ. The Chromosomal Location of Resistant Gene ——Primary Trisomica Analysis

本文研究了云南稻品种冬糯对我国水稻白叶枯病(Xanthomonas campestris pv. oryxac)菌系“江陵691”的抗性遗传和抗病基因与初级三体额外染色体的关系。冬糯对白叶枯病菌系“江陵691"的抗性受一对隐性基因控制(xa-k);该抗病基因分别与Xa-a、xa-c、Xa-(?)、Xa-f和Xa-i不等位,并呈独立遗传;与Xa-g不等位,呈连锁遗传,重组值为28.7%。冬糯抗病基因与Triplo-7的额外染色体即第7染色体有关,推定冬糯所带的抗病基因位于第7染色体上。以IR36为遗传背景的初级三体系带有一对显性抗白叶枯病基因,该抗病基因位于第11染色体上。

The test was carried out at Huazhong Agricultural University from 1988 to 1990. The mode of inheritance and allelic relationship of gene for resistance to bacterial blight in Yunnan rice variety Dongnuo were studied. The relationship between resistant gene in Dongnuo and the extra chromosomes of 10 primary trisomics were analysed. The results are as follows:1. The resistance to s bacterial blight strain 'Jiangling 691' (from Hubei Province) in Yunnan rice variety Dongnuo is controlled by a single recessive gene and is independent of Xa-a, xa-c, Xa-e, Xa-f and Xa-i. This recessive gene is linked to the resistant gene Xa-g in Zenith with recombination value of 28.7%. The resistant gene in Dongnuo isdesignated as xa-k temporarily.2. It is discovered by trisomic analysis that the resistant gene xa-k is related to the extra chromosome of triplo-7, i.e. chromosome 7.3. Primary trisomics of IR36 background have a dominant gene for resistance to the bacterial blight strain 'Jiangling 691'. It was found that the dominant gene is related to the extra chromosome of triplo-11, i.e. chromosome 11.