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采用致病率和毒力频率分析方法,用已知生理小种的99个黑龙江省稻瘟病菌菌株对31个水稻品种(系)进行苗期人工接种。结果表明,供试的31个品种(系)没有免疫品种,供试菌株对水稻品种(系)的平均致病率表现不一,平均致病率最低为3.56%(龙粳8号),最高为77.55%(东农2009)。毒力频率也有明显差异,最低4.04%(龙粳8号),最高为73.73%(东农2009),毒力频率低于20%的水稻品种有7个,分别是龙D99-904(VF=19.19%)、龙丰8811(VF=17.17%)、龙选99-215(VF=17.17%)、藤系38(VF=16.16%)、龙选99-196(VF=15.15%)、品鉴2号(VF=12.12%)和龙粳8号(VF=4.04%)。
Using the pathogenicity and virulence frequency analysis method, 31 rice cultivars (lines) were inoculated at the seedling stage with 99 M. grisea strains of known race of races. The results showed that there were no immunized cultivars for the 31 cultivars tested, and the mean pathogenicity of the tested cultivars was different from that of the rice cultivars (lines). The average minimum incidence rate was 3.56% (Longjing 8) 77.55% (Dongnong 2009). The frequency of virulence was also significantly different. The lowest was 4.04% (Longjing 8) and the highest was 73.73% (Dongnong 2009). Seven rice cultivars with less than 20% virulent frequency were D99-904 (VF = 19.19%), Longfeng 8811 (VF = 17.17%), Longsheng 99-215 (VF = 17.17%), Rattan 38 (VF = 16.16%), Longshang 99-196 (VF = 15.15% 2 (VF = 12.12%) and Longjing 8 (VF = 4.04%).