Ectomycorrhizal Pisolithus albus inoculation of "Acacia spirorbis" and Eucalyptus globulus grown in ultramafic topsoil enhances plant growth and mineral nutrition while limits metal uptake

Jourand Philippe, Hannibal Laure, Majorel Clarisse, Ducousso Marc, Lebrun Michel. 2014. Ectomycorrhizal Pisolithus albus inoculation of "Acacia spirorbis" and Eucalyptus globulus grown in ultramafic topsoil enhances plant growth and mineral nutrition while limits metal uptake. Journal of Plant Physiology, 171 (2) : 164-172.

https://doi.org/10.1016/j.jplph.2013.10.011

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Quartile : Q2, Sujet : PLANT SCIENCES

Résumé : Ectomycorrhizal fungi (ECM) isolates of Pisolithus albus (Cooke and Massee) from nickel-rich ultramafic topsoils in New Caledonia were inoculated onto Acacia spirorbis Labill. (an endemic Fabaceae) and Eucalyptus globulus Labill. (used as a Myrtaceae plant host model). The aim of the study was to analyze the growth of symbiotic ECM plants growing on the ultramafic substrate that is characterized by high and toxic metal concentrations i.e. Co, Cr, Fe, Mn and Ni, deficient concentrations of plant essential nutrients such as N, P, K, and that presents an unbalanced Ca/Mg ratio (1/19). ECM inoculation was successful with a plant level of root mycorrhization up to 6.7%. ECM symbiosis enhanced plant growth as indicated by significant increases in shoot and root biomass. Presence of ECM enhanced uptake of major elements that are deficient in ultramafic substrates; in particular P, K and Ca. On the contrary, the ECM symbioses strongly reduced transfer to plants of element in excess in soils; in particular all metals. ECM-inoculated plants released metal complexing molecules as free thiols and oxalic acid mostly at lower concentrations than in controls. Data showed that ECM symbiosis helped plant growth by supplying uptake of deficient elements while acting as a protective barrier to toxic metals, in particular for plants growing on ultramafic substrate with extreme soil conditions. Isolation of indigenous and stress-adapted beneficial ECM fungi could serve as a potential tool for inoculation of ECM endemic plants for the successful restoration of ultramafic ecosystems degraded by mining activities.

Mots-clés Agrovoc : Pisolithus, Acacia, Eucalyptus globulus, croissance, physiologie végétale, nutrition des plantes, métal lourd, type de sol chimique, ectomycorhize

Mots-clés géographiques Agrovoc : Nouvelle-Calédonie, France

Mots-clés complémentaires : Acacia spirorbis, Terrain minier, Pisolithus albus

Classification Agris : F62 - Physiologie végétale - Croissance et développement
P36 - Érosion, conservation et récupération des sols
P35 - Fertilité du sol
P34 - Biologie du sol

Champ stratégique Cirad : Axe 1 (2014-2018) - Agriculture écologiquement intensive

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