青海省马铃薯黑胫病病原菌的鉴定

为明确引起青海省马铃薯黑胫病的病原菌,从青海省不同地区马铃薯黑胫病病样分离病原菌,研究病原菌的形态学特征、致病性、生理生化特性,并结合16S rRNA序列进行病原学鉴定。结果表明:引起马铃薯黑胫病的5个菌株均为黒腐果胶杆菌(Pectobacterium atrosepticum),来源不同的菌株接种马铃薯后致病力有差异;其中,3株强致病力菌株主要来自于乐都、湟中和大通,2株中等致病力菌株来自于民和和湟源。综上,黒腐果胶杆菌是引起青海省马铃薯黑胫病的病原菌。

Identification of blackleg pathogen on potato (Solanum tuberosum L.) in Qinghai

The causal pathogen causing blackleg of Solanum tuberosum L. was observed in the plantation in Qinghai Province in recent years. Five strains isolaed from five counties in Qinghai were characterized by morphological, biochemical and physiological methods, and analyses of 16S rRNA sequence as well as Pa subspecies geneome. The results indicated that all of the five strains were pathogenic to potato and caused blackleg of potato, suggesting that Pectobacterium atrosepticum was the blackleg pathogens on potato in Qinghai. The pathogenicity tests of the bacterial strains showed significant difference among the species isolated from different regions in Qinghai. Three highly pathogenic strains came from Ledu, Huangzhong and Datong, two moderately pathogenic strains mainly came from Minhe and Huangyuan. Pectobacterium atrosepticum was the blackleg pathogen on potato (Solanum tuberosum L.) in Qinghai Province.