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Quantification of ectomycorrhizal fungal effects on the bioavailability and mobilization of soil P in the rhizosphere of Pinus pinaster
Author(s) -
Casarin Valter,
Plassard Claude,
Hinsinger Philippe,
Arvieu JeanClaude
Publication year - 2004
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.2004.01093.x
Subject(s) - pinus pinaster , rhizosphere , ectomycorrhiza , symbiosis , biology , shoot , mycorrhiza , botany , pinus <genus> , siderophore , agronomy , genetics , bacteria
Summary• A differential effect of ectomycorrhizal symbiosis on soil P mobilization and host P nutrition is shown after culture of Pinus pinaster associated with Hebeloma cylindrosporum and Rhizopogon roseolus , poor and good oxalate/proton producers, respectively. • Plants were grown in minirhizoboxes with a thin layer of a Mediterranean soil with a low level of easily available P. This soil was supplemented, or not, with inorganic P and/or CaCO 3 . The fungal efficiency on P mobilization and host mineral nutrition was quantified after a 3‐month culture period. • R. roseolus had a strong effect on the mobilization of poorly available P, whereas H. cylindrosporum had no effect. However, CaCO 3 suppressed the positive effect of R. roseolus . Hydroxyapatite had the greatest effect on growth and P nutrition of nonmycorrhizal plants. With soluble P addition, both ectomycorrhizal species improved shoot P concentrations. • The relationship between soil available P and shoot P concentrations enabled us to separate the fungal effects into two categories, the chemical actions and the soil exploration, explaining the positive effect of ectomycorrhizal symbiosis on P. pinaster P nutrition.