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由一九八三年起,利用水稻广谱感病品种和抗性较差的生产品种与抗病品种杂交,进行抗性基因分析。结果有丽江新团黑谷×黑节谷等十二个组合 F_2代的抗感分离比为3∶1,抗性由一对显性基因控制;丽江黑谷×南56等两个组合的分离比为15∶1,抗性是由两对同义基因控制;丽江新团黑谷×小白谷等7个组合的分离比为9∶7,抗性是由两对显性互补基因控制。利用日本七个鉴别菌系测定了云南36个品种,其中24个属 Pi——Z~t 型,5个属于 Pi——K、Pi——a 型,3个属于 Pi——ta 型,另外属于 Pi——K~S、Pi——i、Pi——K、Pi——a 的各一个。利用日本13个单基因鉴别品种测定了云南稻瘟病菌株46个,结果摸清了各菌株所具有的致病基因和非致病基因,为筛选我们的一套鉴别菌系打下了基础。
Since 1983, resistance gene analysis has been carried out by crossing broad-spectrum susceptible rice varieties and poorly-produced varieties with resistant varieties. The results showed that the anti-susceptible segregation ratio of F_2 was 12: 1 in Lijiang Xintiandi Black Valley × Heiutigu and the resistance was controlled by a pair of dominant genes. The isolation of two combinations of Lijiang Black Valley × South 56 and so on The resistance was controlled by two pairs of synonymous genes. The segregation ratio of 7 combinations in Lijiang Xintiao Heigu and Xibai Valley was 9: 7, and resistance was controlled by two pairs of dominant complementary genes. Thirty - six Yunnan cultivars were identified by using seven differential strains in Japan, of which 24 were Pi - Z - t, 5 were Pi - K, Pi - a, 3 were Pi - ta, Belong to each of Pi - K ~ S, Pi - i, Pi - K, Pi - a. A total of 46 strains of Magnaporthe grisea from Yunnan were tested using 13 single-gene-identification cultivars in Japan. The results showed that the pathogenic and non-pathogenic genes of each strain were found, which laid the foundation for screening a set of identification strains.