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- W2034890973 abstract "Quantification des ions oxalate et des protons liberes par les champignons ectomycorhiziens dans le sol rhizospherique. Cet article porte sur l'etude des excretions de protons et d'oxalate en nutrition nitrique par deux champignons ectomycorhiziens, Hebeloma cylindrosporum et Rhizopogon roseolus, en culture isolee ou en association avec Pinus pinaster. Un dispositif original de culture sur couche mince de sol a permis d'observer la croissance des racines mycorhizees et de mesurer le pH et l'oxalate a differents niveaux: racines, mycorhizes, hyphes externes et sol rhizospherique. Les resultats montrent des differences de comportement entre especes fongiques en culture pure, differences strictement conservees dans l'association avec la plante. R. roseolus acidifie fortement la rhizosphere et l'excretion de protons s'accompagne d'une excretion d'oxalate, favorisee par la presence de CaCO 3 dans le sol. Une correlation etroite existe entre le pH et la teneur en oxalate du sol rhizospherique, indiquant que les ions oxalate et protons sont excretes simultanement. H. cylindrosporum ne presente pas ces proprietes et a tendance a alcaliniser le sol rhizospherique. Ces actions chimiques exercees par R. roseolus pourraient contribuer a la mobilisation de P du sol." @default.
- W2034890973 created "2016-06-24" @default.
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- W2034890973 date "2003-07-01" @default.
- W2034890973 modified "2023-10-13" @default.
- W2034890973 title "Quantification of oxalate ions and protons released by ectomycorrhizal fungi in rhizosphere soil" @default.
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- W2034890973 doi "https://doi.org/10.1051/agro:2003020" @default.
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