数字农科院2.0

Earthworms synergize with indigenous soil functional microorganisms to accelerate the preferential degradation of the highly toxic S-enantiomer of the fungicide imazalil in soil

文献类型： 外文期刊

作者： Lingxi Han;Kuan Fang;Xiangwei You;Yiqiang Li;Xiuguo Wang;Jun Wang

作者机构：

关键词： Earthworms;Gut microorganisms;Imazalil enantiomers;Preferential degradation;Soil microorganisms

期刊名称： Journal of Hazardous Materials

ISSN： 0304-3894

年卷期： 2023 年 457 卷

页码：

收录情况： SCIE（2023版） ; ; EI（2023版）

摘要： The roles of soil and earthworm gut microorganisms in the degradation of the chiral fungicide imazalil (IMA) enantiomers were systemically studied in soil-earthworm systems. S-IMA degraded slower than R-IMA in soil without earthworms. After the addition of earthworms, S-IMA degraded faster than R-IMA. Methylibium was the potential degradative bacterium likely related to the preferential degradation of R-IMA in soil. However, the addition of earthworms significantly decreased the relative abundance of Methylibium, especially in R-IMA-treated soil. Meanwhile, a new potential degradative bacterium Aeromonas first appeared in soil-earthworm systems. Compared with enantiomer-treated soil, the relative abundance of indigenous soil bacterium Kaistobacter significantly boomed in enantiomer-treated soil with earthworms. Interestingly, Kaistobacter in the earthworm gut also obviously increased after exposure to enantiomers, particularly in S-IMA-treated soil, which was associated with the significant increase in Kaistobacter in soil. More importantly, the relative abundances of Aeromonas and Kaistobacter in S-IMA-treated soil were obviously higher than those in R-IMA-treated soil after the addition of earthworms. Moreover, these two potential degradative bacteria were also potential bacterial hosts of the biodegradation genes p450 and bph. Collectively, gut microorganisms are important helpers in soil pollution remediation by participating in the preferential degradation of S-IMA mediated by indigenous soil microorganisms.

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