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1989～1991年以早籼湘州5号、二九丰、浙辐802、广陆矮4号和原丰早等为供试品种,用ZB_1(85-14),ZB-(15)(0262),ZC_(15)(84-76)等稻瘟病菌(有性态为Magnaporthe grisea Barr.,无性态为Pyricularia oryzae Cay.)菌株,分别测定了供试品种的病斑大小、相对侵染率、相对抗病性指数、群体抗病性、病斑产孢能力和潜育期等,统计分析结果表明:上述6个性状在供试品种间均有显著差异,它们均为慢瘟性的有效组分,其中湘州5号、二九丰、浙辐802与对照相比具有病斑小、相对侵染率低、相对抗病性指数较高、群体抗病性较强、病斑产孢能力较差和潜育期较长等特点,表明这3个品种对供试菌株具有慢瘟性的性能,在旱圃条件下表现为发病进程缓慢。相关分析表明各组分之间呈显著相关。此外,本文还就慢瘟性与广谱抗性的关系进行了讨论,并初步提出了慢瘟性的简易鉴定方法。
From 1989 to 1991, the early indica cultivars including Xianzhou 5, Erjiufeng, Zhefu 802, Guangluan 4 and Haofengzao were used as tested cultivars. ZB_1 (85-14), ZB- (15) (0262 ), ZC_ (15) (84-76) and other strains of Magnaporthe grisea Barr. (Pyricularia oryzae Caye) were used to determine the lesion size, relative infection rate , Relative disease resistance index, population disease resistance, sporulation ability and incubation period of diseased plague, etc. The statistical analysis showed that the above six traits were significantly different among the tested cultivars, all of which were effective against chronic blast Among them, Xiangzhou No.5, No.29 Feng and Zhefu 802 had smaller spots, lower relative infection rate, higher relative disease resistance index, stronger population resistance and spore germination Poor ability and longer latent period, indicating that the three cultivars had slow-blasting performance on the tested strains and showed a slow onset of disease under dry conditions. Correlation analysis showed that there was a significant correlation between the components. In addition, this paper also discussed the relationship between the slow-release and broad-spectrum resistance, and initially proposed a simple identification method of slow-release.