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

ABSTRACT: 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 ¹³C, ¹⁵N, ¹⁴C, and ³⁵S 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 SO₄^2- within hours. The SO₄^2- was reutilised by the MB within days. The initial microbial utilisation and SO₄^2- release were determined by amino acid structure. Met released 2.5-fold less SO₄^2- than Cys. The microbial bioma

SUBMITTER: Ma Q 

PROVIDER: S-EPMC8528905 | biostudies-literature | 2021 Nov

REPOSITORIES: biostudies-literature