Journal
BIOGEOSCIENCES
Volume 10, Issue 2, Pages 1155-1167Publisher
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/bg-10-1155-2013
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Funding
- French Institutes INRA-INRIA (ARC-VitelBio)
- French national agency ANR (DIMIMOS)
- le Conseil General d'Auvergne
- European Community [017841, 226701]
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The respiratory release of CO2 from soils is a major determinant of the global carbon cycle. It is traditionally considered that this respiration is an intracellular metabolism consisting of complex biochemical reactions carried out by numerous enzymes and co-factors. Here we show that the endoenzymes released from dead organisms are stabilised in soils and have access to suitable substrates and co-factors to permit function. These enzymes reconstitute an extracellular oxidative metabolism (EXOMET) that may substantially contribute to soil respiration (16 to 48% of CO2 released from soils in the present study). EXOMET and respiration from living organisms should be considered separately when studying effects of environmental factors on the C cycle because EXOMET shows specific properties such as resistance to high temperature and toxic compounds.
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