Substrate control of sulphur utilisation and microbial stoichiometry in soil: Results of C-13, N-15, C-14, and S-35 quad labelling

文献类型： 外文期刊

第一作者： Ma, Qingxu

作者： Ma, Qingxu;Pan, Wankun;Tang, Sheng;Wu, Lianghuan;Ma, Qingxu;Chadwick, David R.;Wen, Yuan;Hill, Paul W.;Jones, Davey L.;Kuzyakov, Yakov;Kuzyakov, Yakov;Kuzyakov, Yakov;Macdonald, Andy;Ge, Tida;Si, Linlin;Jones, Davey L.

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期刊名称：ISME JOURNAL （ 影响因子：9.18； 五年影响因子：10.712 ）

ISSN： 1751-7362

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收录情况： SCI

摘要： Global plant sulphur (S) deficiency is increasing because of a reduction in sulphate-based fertiliser application combined with continuous S withdrawal during harvest. Here, we applied C-13, N-15, C-14, and S-35 quad labelling of the S-containing amino acids cysteine (Cys) and methionine (Met) to understand S cycling and microbial S transformations in the soil. The soil microorganisms absorbed the applied Cys and Met within minutes and released SO42- within hours. The SO42- was reutilised by the MB within days. The initial microbial utilisation and SO42- release were determined by amino acid structure. Met released 2.5-fold less SO42- than Cys. The microbial biomass retained comparatively more C and S from Met than Cys. The microorganisms decomposed Cys to pyruvate and H2S whereas they converted Met to alpha-ketobutyrate and S-CH3. The microbial stoichiometries of C, N, and S derived from Cys and Met were balanced after 4 d by Cys-derived SO42- uptake and Met-derived CO2 release. The microbial C:N:S ratio dynamics showed rapid C utilisation and loss, stable N levels, and S accumulation. Thus, short-term organic S utilisation by soil microorganisms is determined by amino acid structure whilst long-term organic S utilisation by soil microorganisms is determined by microbially controlled stoichiometry.

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