文献类型： 外文期刊
作者： Lv, Mingfa 1 ; Chen, Yufan 1 ; Hu, Ming 1 ; Yu, Qinglin 1 ; Duan, Cheng 1 ; Ye, Sixuan 1 ; Ling, Jinfeng 4 ; Zhou, Jianua 1 ;
作者机构： 1.South China Agr Univ, Integrat Microbiol Res Ctr, Guangzhou 510642, Peoples R China
2.South China Agr Univ, Guangdong Prov Key Lab Microbial Signals & Dis Co, Guangzhou, Peoples R China
3.South China Agr Univ, Guangdong Lab Lingnan Modern Agr, Guangzhou, Peoples R China
4.Guangdong Acad Agr Sci, Res Inst Plant Protect, Guangdong Prov Key Lab High Technol Plant Protect, Guangzhou, Peoples R China
关键词： biofilm; c-di-GMP; Dickeya zeae; motility; pathogenicity; zeamines
期刊名称：MOLECULAR PLANT PATHOLOGY （ 影响因子：5.663； 五年影响因子：5.626 ）
ISSN： 1464-6722
年卷期：
页码：
收录情况： SCI
摘要： Dickeya zeae is the causal agent of rice foot rot disease. The pathogen is known to rely on a range of virulence factors, including phytotoxin zeamines, extracellular enzymes, cell motility, and biofilm, which collectively contribute to the establishment of infections. Phytotoxin zeamines play a critical role in bacterial virulence; signalling pathways and regulatory mechanisms that govern bacterial virulence remain unclear. In this study, we identified a transcriptional regulator OhrR (organic hydroperoxide reductase regulator) that is involved in the regulation of zeamine production in D. zeae EC1. The OhrR null mutant was significantly attenuated in its virulence against rice seed, potato tubers and radish roots. Phenotype analysis showed that OhrR was also involved in the regulation of other virulence traits, including the production of extracellular cellulase, biofilm formation, and swimming/swarming motility. DNA electrophoretic mobility shift assay showed that OhrR directly regulates the transcription of key virulence genes and genes encoding bis-(3 '-5 ')-cyclic dimeric guanosine monophosphate synthetases. Furthermore, OhrR positively regulates the transcription of regulatory genes slyA and fis through binding to their promoter regions. Our findings identify a key regulator of the virulence of D. zeae and add new insights into the complex regulatory network that modulates the physiology and virulence of D. zeae.
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