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Microbial regulation of the soil carbon cycle: evidence from gene-enzyme relationships.


ABSTRACT: A lack of empirical evidence for the microbial regulation of ecosystem processes, including carbon (C) degradation, hinders our ability to develop a framework to directly incorporate the genetic composition of microbial communities in the enzyme-driven Earth system models. Herein we evaluated the linkage between microbial functional genes and extracellular enzyme activity in soil samples collected across three geographical regions of Australia. We found a strong relationship between different functional genes and their corresponding enzyme activities. This relationship was maintained after considering microbial community structure, total C and soil pH using structural equation modelling. Results showed that the variations in the activity of enzymes involved in C degradation were predicted by the functional gene abundance of the soil microbial community (R2>0.90 in all cases). Our findings provide a strong framework for improved predictions on soil C dynamics that could be achieved by adopting a gene-centric approach incorporating the abundance of functional genes into process models.

SUBMITTER: Trivedi P 

PROVIDER: S-EPMC5113853 | biostudies-literature | 2016 Nov

REPOSITORIES: biostudies-literature

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Microbial regulation of the soil carbon cycle: evidence from gene-enzyme relationships.

Trivedi Pankaj P   Delgado-Baquerizo Manuel M   Trivedi Chanda C   Hu Hangwei H   Anderson Ian C IC   Jeffries Thomas C TC   Zhou Jizhong J   Singh Brajesh K BK  

The ISME journal 20160510 11


A lack of empirical evidence for the microbial regulation of ecosystem processes, including carbon (C) degradation, hinders our ability to develop a framework to directly incorporate the genetic composition of microbial communities in the enzyme-driven Earth system models. Herein we evaluated the linkage between microbial functional genes and extracellular enzyme activity in soil samples collected across three geographical regions of Australia. We found a strong relationship between different fu  ...[more]

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