Microbial inoculation improves soil aggregation by enhancing exopolysaccharides and lipopolysaccharides-related gene abundance in saline soil

文献类型： 外文期刊

第一作者： Peng, Yuanyuan

作者： Peng, Yuanyuan;Zhang, He;Li, Guihua;Lv, Zuopeng;Zhang, Jianfeng

作者机构：

关键词： Inoculation; Soil aggregation; Extracellular polymeric substances; Microbial community; Saline soil

期刊名称：APPLIED SOIL ECOLOGY （ 影响因子：5.0； 五年影响因子：5.4 ）

ISSN： 0929-1393

年卷期： 2025 年 214 卷

页码：

收录情况： SCI

摘要： Soil salinization severely deteriorates soil structure, leading to soil health degradation and a decline in agricultural productivity. Extracellular polymeric substances (EPS), including exopolysaccharides (Exp) and lipopolysaccharides (Lip), are well known to promote aggregate stability in non-saline soils. However, the mechanisms by which microbial inoculation influences the microbial production of these aggregate-stabilizing compounds in saline soils remain insufficiently understood. To address this, we used metagenomic sequencing to investigate how inoculation with Bacillus and Trichoderma affects the abundance of genes related to Exp and Lip biosynthesis and associated microbial taxa, and to assess their collective contribution to soil aggregate stability under saline condition. The results revealed that inoculated treatments (T2-T4) significantly increased the water-mean weight diameter (WMWD) by 11.86 %-20.63 % relative to non-inoculated treatment (T1). Additionally, inoculation markedly increased EPS content, with co-inoculation increasing polysaccharides and uronic acids contents by 68.21 % and 36.22 %, respectively, compared to the non-inoculation treatment (T1). Microbial inoculation also significantly altered the microbial community composition, affecting both bacterial and fungal populations. Metagenomic analysis further showed that inoculation significantly enriched the abundance of key genes associated with Exp and Lip biosynthesis, particularly waaF/rfaF, waaP/rfaP, lptG, algA/xanB, lolC_E, vpsI and wza. In parallel, compared to the non-inoculated treatment (T1), co-inoculation (T4) increased the abundance of waaF/rfaF, waaP/rfaP, and vpsI by 20.41 %, 16.54 %, and 28.36 %, respectively. Random forest analysis identified the top three genes (waaF/rfaF, waaP/rfaP, and vpsI) and several bacterial families (Pseudomonadaceae, HTCC2089, Dongiaceae, UBA8366, and Burkholderiaceae_B) as major contributors to soil aggregate stability. These findings demonstrate that microbial inoculations enhance soil aggregation by modulating microbial communities and key functional genes abundance, shedding light on the biological mechanisms underpinning soil structural development in salinized environments.

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