中国水稻近等基因系的育成及其稻瘟病菌生理小种鉴别能力

 水稻品种丽江新团黑谷是一个普感品种。以它作为轮回亲本 ,日本清泽鉴别品种草笛、梅雨明、K1、Pi4号、K60和 BL1作为抗病性供体亲本 ,通过杂交、回交和抗性鉴定 ,培育了一套单基因的水稻近等基因系。这套近等基因系、它们的供体亲本、清泽鉴别品种、国际水稻研究所近等基因系等对菲律宾菌株的生理小种鉴别能力的比较研究结果为 :( 1 )近等基因系的生理小种鉴别能力比其供体亲本强。 ( 2 )中国近等基因系比清泽鉴别品种的小种鉴别能力高。 ( 3)中国近等基因系的生理小种鉴别能力与国际水稻研究所近等基因系相似或较强。但是国际水稻研究所的近等基因系不适用于鉴别粳稻区的稻瘟病菌生理小种 ;而中国近等基因系既适用于籼稻区 ,也适用于粳稻区 ,是可以在国际上通用的鉴别体系。

Development of Chinese Near-isogenic Lines of Rice and Their Differentiating Ability to Pathogenic Races of Pyricularia grisea

The rice variety, Lijiangxintuanheigu(LTH),is a universally susceptible variety. A set of near isogenic lines (NILs) of rice which has a single resistance gene for each line was developed using LTH as recurrent parent and Kusabue,Tsuyuake,K1, Pi No.4,K60 and BL1,which are from kiyosawa's differential varieties(KDV),as donor parents. Differentiating ability of these NILs to Philippine isolates was compared with that of their donor parents,KDV and IRRI's NILs. The results of comparative studies were as follows:(1)Differentiating ability of Chinese NILs to Philippine isolates was much stronger than that of their donor parents.(2)The differentiating ability of Chinese NILs to Philippine isolates was higher than that of KDV. (3)Chinese NILs had similar ability to differentiate races to IRRI's NILs or higher differentiating ability than them.But IRRI's NILs had very low differentiating ability to isolates from japonica rice growing regions(JRGR).They can not be used to differentiate races of isolates from JRGR. Whereas, Chinese NILs can be used to differentiate races of isolates from both JRGR and indica rice growing regions. It was concluded that the set of Chinese NILs can be used as international differentials.