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Growth-promoting bacterium Enterobacter sp. CS8-gfp triggers jasmonate signaling pathway for atrazine and thiamethoxam degradation in rice (Oryza sativa L.)

文献类型： 外文期刊

作者： Ma, Li Ya 1 ; Wan, Qun 1 ; Ge, Jing 1 ; Li, Yong 1 ; Feng, Fayun 1 ; Li, Mei 1 ; Cheng, Jinjin 1 ; Chen, Jian 1 ; Wang, Ya 1 ; Cao, Yaoyao 1 ; Yang, Chenye 3 ; Yu, Xiangyang 1 ;

作者机构： 1.Minist Sci & Technol, Jiangsu Key Lab Food Qual & Safety, State Key Lab Cultivat Base, Zhongling St 50, Nanjing 210014, Peoples R China

2.Jiangsu Acad Agr Sci, Inst Food Safety & Nutr, Zhongling St 50, Nanjing 210014, Peoples R China

3.Jiangsu Acad Agr Sci, Cent Lab, 50 Zhongling St, Nanjing 210014, Peoples R China

关键词： Growth-promoting bacterium; Atrazine; Thiamethoxam; Jasmonic acid; Degradation

期刊名称：JOURNAL OF CLEANER PRODUCTION （ 影响因子：10.0； 五年影响因子：10.7 ）

ISSN： 0959-6526

年卷期： 2025 年 522 卷

页码：

收录情况： SCI

摘要： Accumulating pesticide residues in ecosystems pose environmental risks and raise serious public health concerns. Plant-microbe interactions have been applied in the phytoremediation of pesticides to ensure food safety and reduce environmental health risks. However, the plant signaling molecules triggered by microbes to degrade pesticides remain unclear. Herein, we demonstrated that CS8-gfp, a growth-promoting strain, promoted degradation of two pesticides (herbicide atrazine, ATZ and insecticide thiamethoxam, TMX) in rice plants. An RNA-sequencing (RNA-seq) study of CS8-gfp inoculated/uninoculated rice revealed differential expression (>2 fold change, P < 0.05) of 12 jasmonic acid (JA)-related genes and JA content was increased in CS8-gfp-inoculated rice plants. To validate the role of JA in this process, the mutant osopr7 defective in JA synthesis was generated by gene-editing technologies. Analysis of physiological responses and pesticides residues revealed that osopr7 impaired the ability of CS8-gfp to alleviate ATZ/TMX toxicity and reduce ATZ/TMX content in rice plants. Using LC-QTOF-MS/MS, we characterized eighteen of ATZ and fifteen of TMX degradation products, and three ATZ derivatives and eight TMX conjugates were identified for the first time in rice plants. Moreover, the enhancement of degradation products in wild type plants was 1.03-4.56 times (ATZ) and 1.27-5.08 times (TMX) higher than that in osopr7 under CS8-gfp colonization. These results suggest that activation of the JA pathway in rice by CS8-gfp accelerates ATZ/TMX detoxification. Our work provides the first evidence of JA-mediated microbial detoxification of pesticides in rice and reveals the underlying mechanism for growth-promoting bacteria to eliminate pesticides in crops and reduces environmental risks to human health through the food chain.

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