Compositional differences in simulated root exudates elicit a limited functional and compositional response in soil microbial communities

Frontiers in Microbiology
Michael S StricklandMark A Bradford

Abstract

Inputs of low molecular weight carbon (LMW-C) to soil - primarily via root exudates- are expected to be a major driver of microbial activity and source of stable soil organic carbon. It is expected that variation in the type and composition of LMW-C entering soil will influence microbial community composition and function. If this is the case then short-term changes in LMW-C inputs may alter processes regulated by these communities. To determine if change in the composition of LMW-C inputs influences microbial community function and composition, we conducted a 90 day microcosm experiment whereby soils sourced from three different land covers (meadows, deciduous forests, and white pine stands) were amended, at low concentrations, with one of eight simulated root exudate treatments. Treatments included no addition of LMW-C, and the full factorial combination of glucose, glycine, and oxalic acid. After 90 days, we conducted a functional response assay and determined microbial composition via phospholipid fatty acid analysis. Whereas we noted a statistically significant effect of exudate treatments, this only accounted for ∼3% of the variation observed in function. In comparison, land cover and site explained ∼46 and ∼41% of the va...Continue Reading

References

Jan 13, 2006·Proceedings of the National Academy of Sciences of the United States of America·Noah Fierer, Robert B Jackson
May 4, 2006·Annual Review of Plant Biology·Harsh P BaisJorge M Vivanco
Jul 3, 2007·Ecology·Noah FiererRobert B Jackson
Mar 28, 2009·Ecology·Michael S StricklandMark A Bradford
Nov 10, 2010·The New Phytologist·Marie-Anne de GraaffChristopher W Schadt
Jun 11, 2011·FEMS Microbiology Ecology·Shengjing ShiLeo M Condron
Aug 13, 2011·Frontiers in Microbiology·Katherine C GoldfarbEoin L Brodie

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