福建省水稻白叶枯病菌系及其应用研究
STUDY ON THE STRAINS OF RICE BACTERIAL LEAF BLIGHT AND ITS APPLICATION IN FUJIAN
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摘要: 1980~1984年共测福建省56县稻白叶枯病298菌株,据其致病力强弱划分为四个菌系群(Ⅰ-Ⅳ)。菌株和品种间的关系存在着数量级差异,尚未发现有明显的特异性反应,其分布特点有沿海强、山区弱的趋势。用Ⅱ-Ⅳ菌系群的13个菌株测定国内外部份水稻品种抗性,有15个品种表现强的抗病性。我省早、晚稻当家品种都为感病或中感品种。74-105品种表现高抗、耐淹,适宜在沿江沿海低洼易淹稻田推广种植。杂交稻威优6号、威优30、四优30为较好抗病组合,已在全省推广应用。Abstract: During 1980-1984, two hundred and ninetyeight strains of rice bacterial leaf blight(Xanthomonas campestris pv oryzae)were collected from 56 counties and were tested for pathogenicity in Fujian. According to the intensity of virulence, they were divided into four groups: I. II. III and IV, while 298 strains were inoculated onb differential varieties of rice. So far the reactions between pathogen and host showed that the quantitative differences were attended. No specificity was found. The tendency of strains distribution in Fujian showed that strong strains were in the coastal plains and weak strains were in the mountainous area. Some rice varieties. from home and abroad were tested for resistance by using 13 strains of II-IV groups. Fifteen varieties were showed higher resistance. In Fujian most of early and late rice varieties were susceptible or mid-resistance after tested, But the variety, 74-105, was higher resistant and durable to flooding in paddy fields than others. Therefore it was planted along river side where floods often took place. Weiyou No. 6,Weiyou No. 30,and Siyou No. 30 of hybrid rice were better resistant combinations which had been released in Fujian.
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