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9 - Rhizosphere carbon flow: a driver of soil microbial diversity?
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- By D. B. Standing, University of Aberdeen, J. I. Rangel Castro, University of Aberdeen, J. I. Prosser, University of Aberdeen, A. Meharg, University of Aberdeen, K. Killham, University of Aberdeen
- Edited by Richard Bardgett, Lancaster University, Michael Usher, University of Stirling, David Hopkins, University of Stirling
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- Book:
- Biological Diversity and Function in Soils
- Published online:
- 17 September 2009
- Print publication:
- 22 September 2005, pp 154-168
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- Chapter
- Export citation
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Summary
SUMMARY
Microorganisms play an essential role in modulating the fluxes of organic carbon and nutrients in soil. However, their diversity and functional significance are largely unknown. Recent technical developments in molecular, chemotaxonomic and physiological techniques complement traditional techniques and can now enable us to investigate the linkage between rhizosphere carbon flow, microbial diversity and soil function.
Reporter gene systems provide an important method for resolution of rhizosphere carbon flow. Their greatest advantage is that they can be used in situ without uncoupling the plant–microbial interaction vital to maintaining both quantity and quality of carbon flow.
Any consideration of rhizosphere carbon flow and soil microbial diversity should not only include substrate carbon flow and trophic interactions, but also the role of signal molecules, especially in terms of controlling rhizosphere community structure, diversity and function.
Little is known of carbon flow in natural systems. Ecosystem function and, specifically, carbon-cycling pathways can be determined by lipid analysis or nucleic acid stable isotope probing (SIP) using 13C incorporated into microbial biomass. The ability to ascertain which components of the biomass are being enriched in root-derived carbon enables an understanding of how rhizosphere carbon drives microbial diversity.
Changes in 16S rDNA sequence diversity and relative abundance provide indications of which organisms are responding to changing conditions and SIP analysis of mRNA allows for assessment of their activity, and thus may be used to follow changes in the microbial community during rhizosphere development.
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