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选用我省不同地区及不同致病型的6个甘薯瘟菌株(包括浙江平阳菌株1个),测定供试10个鉴别品种的致病反应,结果表明甘薯瘟菌株以是否侵染梅尖红,华北48,豆沙薯3个品种,而明显地分为两个致病菌群。对上述品种不能侵染者称菌系群Ⅰ,反之具有中度或高度侵染力者,称菌系群Ⅱ。由于后者有极强的致病力,使现有对菌系群Ⅰ具有高抗的推广品种,部分丧失或完全丧失其抗病性,这样的致病菌群出现在抗病品种多年连作的老病地或老病区。因此,作者认为筛选高抗极强菌系的抗原亲本,选育具有广谱抗病性的品种,已成为抗瘟育种的紧迫任务。抗病品推种广中应在查清菌系分布的基础上,选用不同抗性类型的品种轮换栽培,以防止病菌毒性变异,达到稳定抗病的增产效果。
Six strains of F. humantans (including one strain of Pingyang in Zhejiang Province) were selected from different regions and different pathogenic strains in our province to determine the pathogenic response of 10 cultivars tested. The results showed that whether F. crispus infected P. plum, North China 48, bean and potato 3 varieties, but obviously divided into two groups of pathogenic bacteria. Those who can not be infected with the above-mentioned strains of bacteria called Group Ⅰ, on the contrary with moderate or high infectivity, said strain Ⅱ. Due to the strong virulence of the latter, the existing varieties with high resistance to mycobacterial group I are partly lost or completely lost in disease resistance, and such pathogenic bacteria occur in the continuous cropping of resistant varieties for many years Old sick or old ward. Therefore, the authors believe that the screening of anti-protoplasmic anti-protoplast parents, breeding broad-spectrum disease-resistant varieties has become an urgent task of blast-breeding. On the basis of identifying the distribution of bacterial strains, we should choose cultivars with different resistance types to rotate and cultivate in order to prevent the variation of pathogenicity and achieve the effect of stable and disease-resistant yield increase.