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Identification and Genome Sequencing of Novel Virulent Strains of Xanthomonas oryzae pv. oryzae Causing Rice Bacterial Blight in Zhejiang, China

文献类型： 外文期刊

作者： Liang, Weifang 1 ; Zhou, Yuhang 2 ; Xu, Zhongtian 3 ; Li, Yiyuan 3 ; Chen, Xinyu 2 ; Yu, Chulang 3 ; Hou, Fan 5 ; Dai, Binfeng 6 ; Zhong, Liequan 6 ; Bi, Ji-An 7 ; Xie, Liujie 8 ; Yan, Chengqi 7 ; Chen, Jianping 1 ; Yang, Yong 2 ;

作者机构： 1.Yunnan Agr Univ, Coll Plant Protect, Kunming 650000, Peoples R China

2.Zhejiang Acad Agr Sci, Inst Virol & Biotechnol, State Key Lab Managing Biot & Chem Threats Qual &, Key Lab Biotechnol Plant Protect MOA China & Zheji, Hangzhou 310000, Peoples R China

3.Ningbo Univ, Inst Plant Virol, State Key Lab Managing Biot & Chem Threats Qual &, Key Lab Biotechnol Plant Protect MOA China & Zheji, Ningbo 315000, Peoples R China

4.Shenyang Agr Univ, Coll Plant Protect, Shenyang 110000, Peoples R China

5.Wuwangnong Seed Shareholding Co Ltd, Hangzhou 310000, Peoples R China

6.Taizhou Agroecol Protect & Qual Safety Ctr, Taizhou 318000, Peoples R China

7.Ningbo Acad Agr Sci, Inst Biotechnol, Ningbo 315000, Peoples R China

8.Taizhou Acad Agr Sci, Taizhou 318000, Peoples R China

关键词： avirulence gene; genome sequencing; TAL effector; Xanthomonas oryzae pv. oryzae

期刊名称：PATHOGENS （ 影响因子：3.3； 五年影响因子：3.6 ）

ISSN：

年卷期： 2024 年 13 卷 12 期

页码：

收录情况： SCI

摘要： Xanthomonas oryzae pv. oryzae (Xoo) is the causative agent of rice bacterial blight (RBB), resulting in substantial harvest losses and posing a challenge to maintaining a stable global supply. In this study, Xoo strains isolated from Shaoxing, Quzhou, and Taizhou, where RBB occurred most frequently in Zhejiang Province in 2019, were selected as the subjects of research. Three isolated pathogenic bacteria of ZXooS (from Shaoxing), ZXooQ (from Quzhou), and ZXooT (from Taizhou) were all identified as novel Xoo strains. These novel strains demonstrate greater virulence compared to Zhe173, the previous epidemic Xoo strain from Zhejiang Province. Subsequent genomic sequencing and analysis revealed that there existed significant differences in the genome sequence, especially in effector genes corresponding to some known rice resistance (R) genes between the novel strains and Zhe173. The sequence alignment of avirulent genes (effector genes) indicated that nucleic and amino acid sequences of AvrXa5, AvrXa7, AvrXa10, and AvrXa23 in the novel strains varied prominently from those in Zhe173. Interestingly, it seemed that only the genome of ZXooQ might contain the AvrXa3 gene. In addition, the phylogenetic analysis of 61 Xoo strains revealed that the novel strains were situated in a distinct evolutionary clade separate from Zhe173. These results here suggest that the emergence of novel Xoo strains may lead to resistance loss of some R genes used in commercial rice varieties, potentially serving as one of the factors leading to RBB resurgence in Zhejiang Province, China.

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