Serratia marcescens AB1: A rhizosphere bacterium mitigating the acetochlor stress on the soil environment

文献类型： 外文期刊

第一作者： Dong, Meiqi

作者： Dong, Meiqi;Xiao, Yufeng;Yang, Bingbing;Wang, Siya;Sun, Liangpeng;Han, Zhe;Zhang, Hao;Wu, Xian

作者机构：

关键词： Serratia marcescens AB1; Bioremediation; Biofilm; Soil enzyme activity; Colonization; Acetochlor

期刊名称：RHIZOSPHERE （ 影响因子：3.4； 五年影响因子：3.6 ）

ISSN：

年卷期： 2024 年 30 卷

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收录情况： SCI

摘要： Microbial remediation, a significant research focus in bioremediation, shows promise in addressing pollution. In this study, the optimal medium for acetochlor-degrading bacteria AB1 was determined by the response surface method as 29.94 g L-1 sucrose, 10.06 g L-1 yeast extract, and 20.32 g L-1 NaCl. The single-factor method identified optimum degradation conditions, including a temperature of 30 degrees C, pH of 7.0, inoculation with 3% AB1, and an initial acetochlor concentration of 10 mg L-1. The strain reached a maximum degradation rate of 79.87% within 5 days. AB1 performed nitrogen fixation, phosphorus dissolution, potassium hydrolysis, siderophore production, and biofilm formation. In the presence of acetochlor, it also induced the upregulation of genes, wza and luxS. Utilizing a green fluorescent protein and rifampicin-resistant strain LAB1-gfp, it demonstrated stable colonization in maize rhizospheres and soils, enhancing growth and degradation. This reduced the acetochlor half-life to 12.77 days and increased soil enzyme activity, providing a theoretical foundation for acetochlor bioremediation.

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