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Published on: January 18, 2014
Changes in cytoplasmic carbon and nitrogen pools in a soil bacterium and a fungus in response to salt stress
J P Schimel1, W J Scott, K Killham
1Department of Plant and Soil Science, University of Aberdeen, Aberdeen AB9 2UE, Scotland.
Abstract:
The effects of water potential on the cellular compositions of a soil bacterium and a fungus were examined by growing the organisms in media with various KCl concentrations. In media containing up to 1 M KCl, C/N ratios in Aspergillus flavus increased significantly, while those for a Pseudomonas sp. did not. For both organisms, the proportions of cellular C and N in cytoplasm increased by a factor of 10 as salinity increased from 0 to 1 M KCl. Such compositional changes have implications for microbial biomass dynamics in soils of varying water potential and for biomass measurement by chloroform fumigation.
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