Journal
ECOSYSTEMS
Volume 16, Issue 1, Pages 133-145Publisher
SPRINGER
DOI: 10.1007/s10021-012-9601-8
Keywords
alanine; DON; enantiomers; low molecular weight; oligopeptide; terrestrial nitrogen cycling
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Funding
- UK Natural Environment Research Council
- NERC [NE/E017304/1] Funding Source: UKRI
- Natural Environment Research Council [ceh010010, NE/E017304/1] Funding Source: researchfish
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Over the past 20 years, our understanding of soil nitrogen (N) cycling has changed with evidence that amino acids are major substrates for both soil microorganisms and plants. However, the recent discovery that plants and microorganisms can directly utilize small peptides in soil needs to be evaluated for its ecological significance, because peptides are released earlier in protein decomposition and thus would provide significant competitive advantage to any organism that can use them directly. We tested whether soil microorganisms took up peptides faster than amino acids across a broad range of ecosystems. We show that l-enantiomeric-peptidic-N is taken up significantly faster than the equivalent monomer, and that this is universal across soils from different ecosystems, with distinct microbial communities. Peptides may have an unrecognized, global, importance in the terrestrial N cycle, providing N to soil microorganisms at an earlier stage of decomposition than previously acknowledged.
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