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Extracellular phosphatases and phosphorus nutrition in mycorrhizal fungi and host plants



Extracellular phosphatases and phosphorus nutrition in mycorrhizal fungi and host plants



Physiologie Vegetale 24(2): 173-184



In order to gain a better understanding of the phosphorus nutrition of mycorrhizal plants, the influence of phosphorus starvation on the extracellular phosphatases of two Pinus species (P. halepensis and P. pinaster) and of higher fungi [Pisolithus tinctorius] in association or not, has been studied. The phosphorus deficiency of the medium produces an increase in accessible phosphatase activities. Analysis of the phosphatases excreted by different basidiomycetes showed a great variation in the total hydrolytic activity and specific activity for different phosphorylated substrates. No differences appeared in the behaviour of phosphatases produced by mycorrhizal or saprophytic fungi. Formation of ectomycorrhiza produced a stimulation of accessible phosphatases in the symbiosis. The fungus seems to be determinant in the increase of these activities and in competence towards phosphorylated substrates. The extracellular phosphatases (accessible or excreted) are potentially able to intervene directly in the hydrolysis of phosphorylated substrates in soil and so increase the phosphorus pool available to the plant.

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Accession: 005434503

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