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Silicon-Mediated Tomato Resistance Against Ralstonia solanacearum is Associated with Modification of Soil Microbial Community Structure and Activity

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Abstract

Bacterial wilt caused by Ralstonia solanacearum is a serious soil-borne disease of Solanaceae crops. In this study, the soil microbial effects of silicon-induced tomato resistance against R. solanacearum were investigated through pot experiment. The results showed that exogenous 2.0 mM Si treatment reduced the disease index of bacterial wilt by 19.18 % to 52.7 % compared with non-Si-treated plants. The uptake of Si was significantly increased in the Si-treated tomato plants, where the Si content was higher in the roots than that in the shoots. R. solanacearum inoculation resulted in a significant increase of soil urease activity and reduction of soil sucrase activity, but had no effects on soil acid phosphatase activity. Si supply significantly increased soil urease and soil acid phosphatase activity under pathogen-inoculated conditions. Compared with the non-inoculated treatment, R. solanacearum infection significantly reduced the amount of soil bacteria and actinomycetes by 52.5 % and 16.5 %, respectively, but increased the ratio of soil fungi/soil bacteria by 93.6 %. After R. solanacearum inoculation, Si amendments significantly increased the amount of soil bacteria and actinomycetes and reduced soil fungi/soil bacteria ratio by 53.6 %. The results suggested that Si amendment is an effective approach to control R. solanacearum. Moreover, Si-mediated resistance in tomato against R. solanacearum is associated with the changes of soil microorganism amount and soil enzyme activity.

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Acknowledgments

This study was financially supported by the National Natural Science Foundation of China and the Natural Science Foundation of Guangdong Province (S2012010010331).

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Authors and Affiliations

  1. Key Laboratory of Tropical Agro-environment, Ministry of Agriculture, South China Agricultural University, Guangzhou, 510642, China

    Lei Wang, Kunzheng Cai & Yuting Chen

  2. College of Horticulture, South China Agricultural University, Guangzhou, 510642, China

    Guoping Wang

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  1. Lei Wang
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Correspondence to Kunzheng Cai.

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Wang, L., Cai, K., Chen, Y. et al. Silicon-Mediated Tomato Resistance Against Ralstonia solanacearum is Associated with Modification of Soil Microbial Community Structure and Activity. Biol Trace Elem Res 152, 275–283 (2013). https://doi.org/10.1007/s12011-013-9611-1

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