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JXB Advance Access originally published online on May 23, 2005
Journal of Experimental Botany 2005 56(417):1729-1739; doi:10.1093/jxb/eri205
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© The Author [2005]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oupjournals.org

FOCUS PAPER

Biological costs and benefits to plant–microbe interactions in the rhizosphere

J. A. W. Morgan, G. D. Bending and P. J. White*

Warwick HRI, University of Warwick, Wellesbourne, Warwick CV35 9EF, UK

* To whom correspondence should be addressed. E-mail: philip-j.white{at}warwick.ac.uk

This review looks briefly at plants and their rhizosphere microbes, the chemical communications that exist, and the biological processes they sustain. Primarily it is the loss of carbon compounds from roots that drives the development of enhanced microbial populations in the rhizosphere when compared with the bulk soil, or that sustains specific mycorrhizal or legume associations. The benefits to the plant from this carbon loss are discussed. Overall the general rhizosphere effect could help the plant by maintaining the recycling of nutrients, through the production of hormones, helping to provide resistance to microbial diseases and to aid tolerance to toxic compounds. When plants lack essential mineral elements such as P or N, symbiotic relationships can be beneficial and promote plant growth. However, this benefit may be lost in well-fertilized (agricultural) soils where nutrients are readily available to plants and symbionts reduce growth. Since these rhizosphere associations are commonplace and offer key benefits to plants, these interactions would appear to be essential to their overall success.

Key words: Micro-organisms, mycorrhiza, nodulation, nutrition, phosphate, rhizosphere


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