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Article

Silicon Controls Bacterial Wilt Disease in Tomato Plants and Inhibits the Virulence-Related Gene Expression of Ralstonia solanacearum

1
Guangdong Provincial Key Laboratory of Eco-Circular Agriculture, Guangzhou 510642, China
2
Tea Research Institute, Guangdong Academy of Agricultural Sciences/Guangdong Key Laboratory of Tea Plant Resources Innovation & Utilization, Guangzhou 510640, China
3
College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Ryoung Shin
Int. J. Mol. Sci. 2022, 23(13), 6965; https://doi.org/10.3390/ijms23136965
Received: 25 April 2022 / Revised: 26 May 2022 / Accepted: 21 June 2022 / Published: 23 June 2022
(This article belongs to the Special Issue Role of Silicon and Biochar in Plant Stress Tolerance)
Silicon (Si) has a multifunctional role in improving plant growth and enhancing plant disease resistance, but its mechanisms are not fully understood. In this study, we investigated the impacts of silicon application on the control of bacterial wilt and elucidated the molecular mechanisms using transcriptome sequencing. Compared to non-Si treatment, Si application (0.5–2 mM) significantly reduces tomato bacterial wilt index by 46.31–72.23%. However, Si does not influence the growth of R. solanacearum. Si application negatively influences R. solanacearum exopolysaccharide (EPS) synthesis and biofilm formation. Transcriptome analysis showed that Si treatment significantly downregulates the expression of virulence genes’ transcriptional regulator (xpsR), EPS synthesis-related genes (epsD and tek), and type III effectors (HrpB2, SpaO, and EscR) in R. solanacearum. In addition, Si remarkably upregulates the expression of twitch motor-related genes (pilE2, pilE, fimT, and PilX). These findings suggest that silicon-suppressed tomato wilt incidence may be due to the regulation of the virulence-related genes of R. solanacearum by Si. Our research adds new knowledge to the application of Si in the field of disease control. View Full-Text
Keywords: silicon; Ralstonia solanacearum; tomato; bacterial wilt; biofilm; virulence-related genes silicon; Ralstonia solanacearum; tomato; bacterial wilt; biofilm; virulence-related genes
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MDPI and ACS Style

Wang, L.; Gao, Y.; Jiang, N.; Yan, J.; Lin, W.; Cai, K. Silicon Controls Bacterial Wilt Disease in Tomato Plants and Inhibits the Virulence-Related Gene Expression of Ralstonia solanacearum. Int. J. Mol. Sci. 2022, 23, 6965. https://doi.org/10.3390/ijms23136965

AMA Style

Wang L, Gao Y, Jiang N, Yan J, Lin W, Cai K. Silicon Controls Bacterial Wilt Disease in Tomato Plants and Inhibits the Virulence-Related Gene Expression of Ralstonia solanacearum. International Journal of Molecular Sciences. 2022; 23(13):6965. https://doi.org/10.3390/ijms23136965

Chicago/Turabian Style

Wang, Lei, Yang Gao, Nihao Jiang, Jian Yan, Weipeng Lin, and Kunzheng Cai. 2022. "Silicon Controls Bacterial Wilt Disease in Tomato Plants and Inhibits the Virulence-Related Gene Expression of Ralstonia solanacearum" International Journal of Molecular Sciences 23, no. 13: 6965. https://doi.org/10.3390/ijms23136965

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