Insights into complex infection by two Pectobacterium species causing potato blackleg and soft rot

文献类型： 外文期刊

第一作者： Su, Zhenhe

作者： Su, Zhenhe;Liu, Xiaomeng;Guo, Qinggang;Lu, Xiuyun;Dong, Lihong;Zhang, Xiaoyun;Wang, Peipei;Zhao, Weisong;Qu, Yuanhang;Li, Shezeng;Ma, Ping;Xuan, Lifeng

作者机构：

关键词： Potato blackleg; Pectobacterium spp; Pathogen mixtures; Pathogenicity

期刊名称：MICROBIOLOGICAL RESEARCH （ 影响因子：5.07； 五年影响因子：7.103 ）

ISSN： 0944-5013

年卷期： 2022 年 261 卷

页码：

收录情况： SCI

摘要： Pectobacterium spp. are causative agents of blackleg and soft rot of potato. However, little is known about the relationship between the pathogenicity of mixed infections of different Pectobacterium spp. at different temperatures. In this study, two pectinolytic strains of Pectobacterium spp. were isolated from the same potato plant with typical symptoms of blackleg and identified as P. brasiliense and P. carotovorum by multilocus sequence analysis (MLSA), whole-genome phylogenetic tree construction, average nucleotide identity (ANI) analysis and digital DNA-DNA hybridization (dDDH). Plant cell wall degrading enzyme, including pectinases, cellulases and proteases, as the most important virulence factors, as well as pathogenicity toward potato tuber, were compared between the strains P. brasiliense BL-2 and P. carotovorum BL-4 at 28 celcius. The results showed that P. carotovorum had higher cell wall-degrading enzyme activities and brought more severe disease symptoms to potato tubers than P. brasiliense. Moreover, the pathogenicity of P. carotovorum and P. brasiliense increased with increasing temperature (20, 25, 28, 32 celcius). The pathogenicity was more severe when P. carotovorum strain BL-4 was coinoculated with P. brasiliense strain BL-2, especially when the former exhibited an advantage in bacterial number at the initial time. The results of this study provide new insight for understanding the pathogenicity caused by mixed infections with different species of Pectobacterium spp., and they may provide some guidance for controlling potato blackleg and soft rot.

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