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4 - Water dynamics of mycorrhizas in arid soils

Published online by Cambridge University Press:  10 December 2009

Michael F. Allen
Affiliation:
Center for Conservation Biology Departments of Plant, Pathology and Biology University of California, Riverside, CA 92521–0334, USA
Geoffrey Michael Gadd
Affiliation:
University of Dundee
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Summary

Introduction

The interaction of mycorrhizas and water in understanding plant water dynamics has been relevant since Frank (1885) first coined the term mykorhiza, a plant–fungus mutualism. He described an ectomycorrhiza as a ‘wet-nurse’ to the host in that water and nutrients must flow through the hyphae to the plant root tip. Stahl (1900) proposed that mycorrhizas increased water throughput, depositing greater amounts of nutrients in the roots resulting in the improved growth. We now know that carbon and nutrient exchange is an active process, regulated by both plant and fungal genes, and requiring substantial inputs of energy from the host and concentrating mechanisms in the fungus. However, water movement is a passive process. That is, it flows in response to energy gradients, without regard to active processes. Because it is a passive process, in mesic regions a large amount of water flows through a relatively saturated soil around the fungal hypha into the rather high area of root surface. This occurs at rates which would not be affected by the comparatively small surface area of the hypha–root interface. The focus of studies on mycorrhizas and water relations has been on whether mycorrhizas enhance plant water uptake with drought. This becomes rather critical in that past studies have often misinterpreted data of mycorrhizas and water flux, or designed studies measuring water fluxes in materials such as sand, or in limited potting volumes (relative to root length) that place unreasonable constraints on mycorrhizal response.

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Publisher: Cambridge University Press
Print publication year: 2006

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