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Resistance against Ralstonia solanacearum in tomato depends on the methionine cycle and the gamma-aminobutyric acid metabolic pathway

文献类型： 外文期刊

作者： Wang, Guoping 1 ; Kong, Jie 4 ; Cui, Dandan 1 ; Zhao, Hongbo 1 ; Niu, Yu 5 ; Xu, Mengyun 2 ; Jiang, Gaofei 6 ; Zhao, Yahu 1 ;

作者机构： 1.South China Agr Univ, Coll Hort, Guangzhou 510642, Guangdong, Peoples R China

2.South China Agr Univ, Coll Hort, Guangdong Prov Key Lab Vegetable Genom & Mol Bree, Guangzhou 510642, Guangdong, Peoples R China

3.South China Agr Univ, Coll Hort, Key Lab Biol & Germplasm Enhancement Hort Crops S, Minist Agr, Guangzhou 510642, Guangdong, Peoples R China

4.South China Agr Univ, Coll Life Sci, Key Lab Prot Funct & Regulat Agr Organisms, Guangzhou 510642, Guangdong, Peoples R China

5.CATAS, Trop Crops Genet Resources Res Inst, Danzhou 571700, Hainan, Peoples R China

6.Nanjing Agr Univ, Coll Life Sci, Dept Microbiol, Nanjing 210000, Jiangsu, Peoples R China

7.Weizmann Inst Sci, Dept Plant Sci, IL-76100 Rehovot, Israel

关键词： Ralstonia solanacearum; methionine cycle; gamma-aminobutyric acid; bacterial wilt; tomato

期刊名称：PLANT JOURNAL （ 影响因子：6.417； 五年影响因子：7.627 ）

ISSN： 0960-7412

年卷期： 2019 年 97 卷 6 期

页码：

收录情况： SCI

摘要： Bacterial wilt caused by Ralstonia solanacearum is a complex and destructive disease that affects over 200 plant species. To investigate the interaction of R. solanacearum and its tomato (Solanum lycopersicum) plant host, a comparative proteomic analysis was conducted in tomato stems inoculated with highly and mildly aggressive R. solanacearum isolates (RsH and RsM, respectively). The results indicated a significant alteration of the methionine cycle (MTC) and downregulation of gamma-aminobutyric acid (GABA) biosynthesis. Furthermore, transcriptome profiling of two key tissues (stem and root) at three stages (0, 3 and 5 days post-inoculation) with RsH in resistant and susceptible tomato plants is presented. Transcript profiles of MTC and GABA pathways were analyzed. Subsequently, the MTC-associated genes SAMS2, SAHH1 and MS1 and the GABA biosynthesis-related genes GAD2 and SSADH1 were knocked-down by virus-induced gene silencing and the plants' defense responses upon infection with R. solanacearum RsM and RsH were analyzed. These results showed that silencing of SAHH1, MS1 and GAD2 in tomato leads to decreased resistance against R. solanacearum. In summary, the infection assays, proteomic and transcriptomic data described in this study indicate that both MTC and GABA biosynthesis play an important role in pathogenic interaction between R. solanacearum and tomato plants.

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