苏皖地区栗疫病菌营养体亲和性研究

ON VEGETATIVE COMPATIBILITY OF CRYPHONECTRIA PARASITICA IN JIANGSU AND ANHUI

对江苏、安徽两省9个县市的栗疫病病原菌菌株进行了营养体亲和性(VC)研究,结果表明,不素和类型可分为3种:Ⅰ型为强不亲和,抗衡区两侧形成明显分生孢子器带;Ⅱ型为弱不亲和,抗衡区内不形成分生孢子器;Ⅲ型为中等不亲和,只在抗衡区的某一侧形成分生孢子器带。可将219个菌株划分为131个营养体亲和组(VCG_s),从而推算出至少有8个VC基因控制菌株的营养体亲和性。根据两省、田间小区以及大病斑上菌株的VCG_s分析,我国板栗疫病菌的VCG_s比其他国家的复杂。本文还探讨了复杂的原因及利用低毒力菌株进行生物防治的可能性。

The vegetative compatibility (VC) in Cryphonectria (Endothia) parasitica (Murr.) Barr isolates collected from Jiangsu and Anhui provinces was studied. The VC of the pathogen was divided into compatible and incompatible, and the later could be divided into three types: Type 1, strong incompatible pairing, pycnidia formed along two sides of the barrage line; Type 2, faint incompatible pairing, no pycnidium along the barrage; and Type 3, middle incompatible pairing, pycnidia along only one side of the barrage line. 219 isolates were divided into 131 vegetative compatible groups (VCG_s). Because VC was determined by nuclear genes, at least 8 VC genes could be estimated. Results showed that the VCG_s of the fungus in China were more complicated than that in other countries.