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Journal of Integrative Agriculture  2018, Vol. 17 Issue (10): 2160-2171    DOI: 10.1016/S2095-3119(18)62036-2
Special Focus: Beneficial roles silicon plays in agriculture Advanced Online Publication | Current Issue | Archive | Adv Search |
Physiological response and phenolic metabolism in tomato (Solanum lycopersicum) mediated by silicon under Ralstonia solanacearum infection
FAN Xue-ying1, 2*, LIN Wei-peng1, 3*, LIU Rui1, JIANG Ni-hao1, CAI Kun-zheng
1 College of Natural Resources and Environment/Key Laboratory of Tropical Agro-environment, Ministry of Agriculture, South China Agricultural University, Guangzhou 510642, P.R.China
2 Laboratory of Ecotoxicity and Environmental Safety, Guangdong Detection Center of Microbiology, Guangdong Institute of Microbiology, Guangzhou 510070, P.R.China
3 Tea Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, P.R.China
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Abstract  
Bacterial wilt, caused by Ralstonia solanacearum (Rs) is a serious soil-borne disease and silicon can enhance tomato resistance against this disease.  However, few studies have focused on the mechanisms of Si-mediated pathogen resistance from the rhizosphere perspective.  In this study, two tomato genotypes, HYT (susceptible) and H7996 (resistant), were used to investigate the effects of silicon application on disease inhibition, root growth, and organic acid content in both roots and root exudates under R. solanacearum infection.  The results showed that Si application significantly suppressed bacterial wilt in HYT, but had no effect in H7996.  Silicon concentrations in roots, stems and leaves of tomato were significantly increased by Si treatment under R. solanacearum inoculation.  In HYT, Si application increased root dry weight by 22.8–51.6% and leaf photosynthesis by 30.6–208.0%, and reduced the concentrations of citric acid in root exudates by 71.4% and in roots by 83.5%.  However, organic acids did not influence R. solanacearum growth.  Results also demonstrated that salicylic acid (SA) content in roots was significantly increased by silicon addition for H7996 and exogenous SA application could reduce bacterial wilt disease index.  Collectively, these results suggest that Si-modulated phenolic compound metabolism in roots or root exudates, especially citric acid and SA, may be a potential mechanism in the amelioration of bacterial wilt disease by Si.
Keywords:  silicon        root        root exudates        Solanum lycopersicum        Ralstonia solanacearum        organic acids  
Received: 13 March 2018   Accepted:
Fund: This study was financially supported by grants from the National Natural Science Foundation of China (31370456), and the Natural Science Foundation of Guangdong Province, China (2017A030313177).
Corresponding Authors:  Correspondence CAI Kun-zheng, E-mail: kzcai@scau.edu.cn    
About author:  FAN Xue-ying, Mobile: +86-13480266290, E-mail: 1229420996@qq.com; * These authors contributed equally to this study.

Cite this article: 

FAN Xue-ying, LIN Wei-peng, LIU Rui, JIANG Ni-hao, CAI Kun-zheng. 2018. Physiological response and phenolic metabolism in tomato (Solanum lycopersicum) mediated by silicon under Ralstonia solanacearum infection. Journal of Integrative Agriculture, 17(10): 2160-2171.

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