生物间遗传学在梨品种与梨黑星菌相互作用中的应用研究

用生物间遗传学的原理和方法对8个梨黑星菌单孢分离物与10个梨品种相互作用进行了分析，结果表明：供试梨品种中至少含有6个抗梨黑星病基因。其中，鸭梨不含抗病基因，菊水梨只含1个抗病基因，金川梨、金花梨、苍溪梨可能分别含1～2、1～3、1～4个抗病基因，其余品种可能分别含有1～5或1～6个抗病基因；根据分离物与梨品种相互作用的抗感表现，可把8个梨黑星菌划分为5～6个不同的类型。

The Application of Interorganismal Genetic in Interactions Between the Varieties of Pear and the Isolates of Pear Scab

The interactions between 10 varieties of pear and 8 isolates of the pear scab fungus (Venturia nashicola) were investigated according to the method of interorganismal genetics. The results showed that there were polygene interactions between the varieties of pear and the isolates of the pear scab. Among the varieties of pear tested there were 1 to 5 or 1 to 6 corresponding gene pairs resistant to the pear scab: 1 to 2,3,or 4 in Jinchuan, Jinhua and Changxi, 1 in Kikusui, 1 to 5 or 1 to 6 in the other tested varieties. By comparing their infection types on the discriminative hosts of the tested varieties,the 8 isolates of the pear scab could be classified into 5 types,which indicated the regional distribution of the pear scab.