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报道了两个稻瘟菌株CH63和TH16的杂交后代在36个水稻品种上的致病性分离、遗传分析以及无毒基因组成的分析结果。78个子囊孢子菌株中呈现显著的致病性分离,共出现71种致病类型,在不同品种上分别出现1∶1、1∶3、3∶1、1∶7、1∶15和15∶1等的无毒性/毒性分离,表明供试菌株对不同品种的无毒性/毒性是一个或多个基因控制的。遗传学分析结果表明,亲本菌株对不同品种的无毒性/毒性控制存在多种类型。菌株CH63对品种K59(Pi-t)、中98-18、特特普、T641、C102TTP(Pi-4)、C101TTP6、ENo.11、农虎6号、C101PKT(Pi-4a)、C105TTP-1(Pi-4)、中156和中98-19分别持有1个无毒基因;对品种1461选、6392选、麻谷泰引1号、Lemont、宫崎7号、Vandana、长香稻、青珍8号和珍优3号分别持有2个无毒基因;对于品种草笛(Pi-k)、品种20中-1、C104LAC(Pi-1)、C103TTP(Pi-1+1b)、K3(Pi-kh)、梅雨明(Pi-km)和东农363分别持有2个以上无毒基因;亲本菌株对于品种四丰43、珍龙13、C101LAC和20中-2分别持有2个无毒基因,关东51、欧244持有2个以上的无毒基因,但因亲本菌株对品种的致病型一致,难以判断控制菌株对品种非亲和性的基因来源。
The pathogenicity, genetic analysis and non-toxic gene composition analysis of 36 rice cultivars were reported for the crossing progenies of two rice blast strains CH63 and TH16. 78 ascospore strains showed significant pathogenicity isolates, a total of 71 kinds of pathogenic types appeared in different varieties were 1: 1, 1: 3, 3: 1, 1: 7, 1:15 and 15: 1, etc., indicating that the tested strains are one or more gene controlled for their non-toxic / toxic to different breeds. Genetic analysis showed that there are many types of non-toxicity / toxicity control of the parent strain on different varieties. The strain CH63 was highly resistant to K59 (Pi-t), 98-18, Tetep, T641, C102TTP (Pi-4), C101TTP6, ENo.11, Nonghu 6, C101 PKT (Pi-4a), C105TTP-1 (Pi-4), Zhong-156 and Zhong-98-19 respectively. The results showed that there were 1 non-toxic genes in 1461, 6392, Muguai lead 1, Lemont, Miyazaki 7, Vandana, There were two non-toxic genes in Zhen-8 and Zhenyou-3, respectively. There was no significant difference in Pi-k, Pi-1, C104LAC, Pi-kh), Meiyu Ming (Pi-km) and Dongnong363 respectively hold two or more non-toxic genes; the parental strain holds two for the varieties SiFu43, ZhenLong13, C101LAC and 20 Zhong-2 respectively Toxicity genes, Kanto 51 and Ou 244, hold more than two non-toxic genes. However, it is difficult to determine the source of the non-compatible gene of the control strain for the species due to the identical pathogenicity of the parent strain to the species.