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Persistence of microbial extracellular enzymes in soils under different temperatures and water availabilities

AuthorsGómez Fernández, Enrique J. ; Delgado Romero, José A. ; González Grau, Juan Miguel
KeywordsExtracellular enzyme activiti
Water availability
Water activity
Organic matter decomposition
Issue Date17-Aug-2020
PublisherJohn Wiley & Sons
CitationEcology and Evolution (2020) https://doi.org/10.1002/ece3.6677
AbstractMicrobial extracellular enzyme activity (EEA) is critical for the decomposition of organic matter in soils. Generally, EEA represents the limiting step governing soil organic matter mineralization. The high complexity of soil microbial communities and the heterogeneity of soils suggest potentially complex interactions between microorganisms (and their extracellular enzymes), organic matter and physicochemical factors. Previous studies have reported the existence of maximum soil EEA at high temperatures although microorganisms thriving at high temperature represent a minority of soil microbial communities. To solve this paradox, we attempt to evaluate if soil extracellular enzymes from thermophiles could accumulate in soils. Methodology at this respect is scarce and an adapted protocol is proposed. Herein, the approach is to analyze the persistence of soil microbial extracellular enzymes at different temperatures and under a broad range of water availability. Results suggest that soil high temperature EEA presented longer persistence than enzymes with optimum activity at moderate temperature. Water availability influenced enzyme persistence, generally preserving for longer time the extracellular enzymes. These results suggests that hightemperature extracellular enzymes could be naturally accumulated in soils. Thus, soils could contain a reservoir of enzymes allowing a quick response by soil microorganisms to changing conditions. This study suggests the existence of novel mechanisms of interaction among microorganisms, their enzymes and the soil environment with relevance at local and global levels.
Description10 páginas.- 3 figuras.- 1 tabla.- 36 referencias
Publisher version (URL)http://dx.doi.org/10.1002/ece3.6677
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