Phosphorus nutrition of mycorrhizal trees

Tree Physiology
C Plassard, B Dell

Abstract

Globally, phosphorus (P) limits productivity of trees in many forests and plantations especially in highly weathered, acidic or calcareous profiles. Most trees form mycorrhizal associations which are prevalent in the organic and mineral soil horizons. This review critically examines mechanisms that enhance the acquisition of P by tree roots. Mycorrhizal roots have a greater capacity to take up phosphate (Pi) from the soil solution than non-mycorrhizal root tips. Factors that contribute to this include the extent of extraradical hyphal penetration of soil and the physiology and biochemistry of the fungal/soil and fungal/plant interfaces. Ectomycorrhizal (ECM) trees are likely to benefit from association with basidiomycetes that possess several high-affinity Pi transporters that are expressed in extraradical hyphae and whose expression is enhanced by P deficiency. To understand fully the role of these putative transporters in the symbiosis, data regarding their localization, Pi transport capacities and regulation are required. Some ECM fungi are able to effect release of Pi from insoluble mineral P through excretion of low-molecular-weight organic anions such as oxalate, but the relative contribution of insoluble P dissolution in...Continue Reading

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Citations

Jan 18, 2011·Journal of Experimental Botany·Tatiana KraiserRodrigo A Gutiérrez
Aug 11, 2010·Tree Physiology·Heinz Rennenberg, Susanne Schmidt
Aug 23, 2011·Tree Physiology·Lucas A CernusakBenjamin L Turner
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