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Isolation, characterization and application of the epoxiconazole-degrading strain Pseudomonas sp. F1 in a soil-vegetable system

文献类型： 外文期刊

作者： Wang, Ya 1 ; Shen, Zhihui 4 ; Feng, Fayun 1 ; Chen, Xiaolong 1 ; Song, Lixiao 1 ; Wan, Qun 1 ; Ma, Liya 1 ; Ge, Jing 1 ; Cheng, Jinjin 1 ; Ren, Liyun 4 ; Yu, Xiangyang 1 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Nanjing 210014, Peoples R China

2.Minist Sci & Technol, Jiangsu Key Lab Food Qual & Safety, State Key Lab Cultivat Base, Nanjing 210014, Peoples R China

3.Jiangsu Univ, Sch Environm & Safety Engn, Zhenjiang 212013, Peoples R China

4.Guangxi Univ, Coll Agr, Nanning 530004, Peoples R China

关键词： Pseudomonas; Endophyte; Vegetable; Epoxiconazole; Degradation

期刊名称：CHEMOSPHERE （ 影响因子：8.943； 五年影响因子：8.52 ）

ISSN： 0045-6535

年卷期： 2022 年 305 卷

页码：

收录情况： SCI

摘要： Epoxiconazole (EPX) has a long half-life in soil and causes various toxicological effects in both the ecosystem and mammals. In this study, eight strains of bacteria capable of degrading EPX were isolated from pesticide-contaminated soil, with strain F1 showing the best effect. This strain was identified as Pseudomonas sp. by 16S rRNA gene sequencing and physiological-biochemical analyses. Our results indicated that strain F1 has a high capacity to degrade EPX, removing 92.1% of EPX within 6 days. The temperature and pH were the two most important environmental factors affecting EPX degradation, followed by substrate concentration and inoculum dose. In addition, strain F1 has a high capacity to promote EPX degradation in soils, with a lower t(1/2) value (2.64 d) in F1-inoculated soil compared to the control (t(1/2) = 96.3 d) without strain F1. The strain could efficiently colonize rhizosphere soil and enhance degradation of EPX, leading to a significant decrease in the accumulation and translocation of EPX in vegetables, thereby alleviating the effects of EPX-induced stress on plants. Moreover, we observed that strain F1-gfp was able to colonize the roots, stems and leaves of Brassica rapa var. chinensis. Such colonization may play a role in the efficient degradation of EPX within plants. To our knowledge, this is the first study to demonstrate biodegradation of EPX in a soil-vegetable system using an EPX-degrading bacterium. This study indicates that strain F1 is a promising candidate for simultaneous bioremediation of soil contaminated with EPX and safe food production.

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