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为探明山桃(Prunus davidiana(Carr.)Franch.)的抗根癌病种质资源价值,采用人工接种的方法评价了实生山桃苗对发根土壤杆菌(Agrobacterium rhizogenes Conn)和根癌土壤杆菌(A.tumefaciens Conn)的抗性。结果表明:接种后70d,接种发根土壤杆菌的山桃株最大瘤茎为0~20.3mm,病情指数为59,根据抗性评价标准判定为低度抗病类型;接种根癌土壤杆菌的山桃株最大瘤茎为0~5.3mm,病情指数为15,根据抗性评价标准判定为高度抗病类型;实生山桃群体对根癌菌的抗性存在广泛的株间分离现象,其对发根土壤杆菌的抗性分离为免疫、高度抗病、中度抗病、低度抗病、感病和易感病6种类型,分别占群体总数的20.8%、5.0%、12.5%、11.7%、20.0%和30.0%;对根癌土壤杆菌的抗性分离为免疫、高度抗病、中度抗病和低度抗病4种类型,分别占群体总数的35.0%、55.8%、8.4%和0.8%。山桃实生群体存在大量对发根土壤杆菌和根癌土壤杆菌免疫型单株,是优异的抗根癌病桃树砧木种质资源树种。
In order to explore the value of germplasm resources for resistance to root-knot disease in Prunus davidiana (Carr.) Franch., The effects of seedling on the growth of Agrobacterium rhizogenes Conn and Agrobacterium tumefaciens A. tumefaciens Conn). The results showed that the maximum tumorous stems of A. amurense inoculated with A. rhizogenes were 0-20.3 mm and the disease index was 59 after 70 days of inoculation, and the low resistance type was judged according to the resistance evaluation criteria. The largest knobs were 0 ~ 5.3mm, the disease index was 15, which was judged as a highly resistant type according to the resistance evaluation criteria. There was a wide range of isolations between strains of R. solani and R. solani, Of the total population were 20.8%, 5.0%, 12.5%, 11.7% and 20.0% of the total population, respectively. And 30.0%, respectively. The resistance to Agrobacterium tumefaciens was divided into four types: immune, highly resistant, moderately resistant and lowly resistant, accounting for 35.0%, 55.8%, 8.4% and 0.8% of the total. There are a large number of peach tree populations of Agrobacterium rhizogenes and Agrobacterium tumefaciens immune type of individual, is excellent resistance to root disease peach tree rootstock germplasm resources.