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6 - Phosphate Nutrition in Root–Fungus Interactions

from Part II - Role of Endophytes in Growth and Biotic and Abiotic Stress Resistance

Published online by Cambridge University Press:  01 April 2019

By
Wael Yakti ,
Diana R. Andrade-Linares ,
Bernard Ngwene ,
Michael Bitterlich ,
Gábor M. Kovács  and
Philipp Franken
Edited by
Trevor R. Hodkinson ,
Fiona M. Doohan ,
Matthew J. Saunders  and
Brian R. Murphy
Trevor R. Hodkinson
Affiliation:
Trinity College Dublin
Fiona M. Doohan
Affiliation:
University College Dublin
Matthew J. Saunders
Affiliation:
Trinity College Dublin
Brian R. Murphy
Affiliation:
Trinity College Dublin
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Summary

Phosphate belongs to the major mineral nutrient category in plants and is a non-renewable resource. Many natural soils are phosphate deficient, and phosphate fixation into insoluble mineral complexes limits plant growth by decreasing root uptake. Different strategies have appeared during the evolution of land plants to cope with this situation, one of which is to interact with various microbes (bacteria and fungi) located in the plant rhizosphere. This chapter will focus on three major groups of fungi that colonise the roots of most land plants: arbuscular mycorrhizal fungi (Glomeromycotina), fungi from the order Sebacinales (Basidiomycota) and the diverse form-group of dark septate endophytes (Ascomycota). Three major mechanisms of fungal contribution to plant nutrition will be discussed. First, fungi are able to solubilise phosphate from inorganic sources that are not available to plants. Second, fungi can set free mineral nutrients from organic compounds/sources. Third, fungi are able to transport phosphate along their hyphae towards the plant, thereby bridging phosphate depletion zones around the roots. In this chapter, we summarise published knowledge on this topic and present some new non-published data to complete our current model.

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Endophytes for a Growing World , pp. 120 - 142
Publisher: Cambridge University Press
Print publication year: 2019

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