Effects of nickel on growth and nutrient concentrations of Cunonia macrophylla, an endemic New Caledonian Cunoniaceae. : Efectos del níquel en el crecimiento y las concentraciones de nutrientes de Cunoniamacrophylla, una Cunoniaceae endémica de Nueva Caledonia

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Leon, Virginie | Fogliani, Bruno | Bouraïma-Madjèbi, Saliou | Pineau, René

Edité par CCSD -

International audience. One of the main characteristics of New Caledonian ultramafic soils is their relatively high Ni concentrations. The objective of this study was to evaluate the Ni tolerance of Cunonia macrophylla Brongniart & Gris, an endemic species of New Caledonian ultramafics. Agreenhouse experiment was conducted to study the effects of addition of Ni solutions (from 5 to 1000 g Ni g–1) on growth and on organic and mineral composition of C. macrophylla. Growth was improved with the addition of 50 g Ni g–1, whereas 1000 g g–1 reduced growth. The results also showed decreased NO3– concentrations in roots at 50 g Ni g–1 treatment, whereas leaf Cu and Zn concentrationsincreased with the same treatment. However, Ni applied at 1000 g g–1 had an antagonistic effect on Kconcentrations in all parts and induced greater sugar and protein concentrations in shoots. Concentrations of Niincreased in all parts with increasing concentrations of applied Ni, with an accumulation in roots. This studyrevealed the possible beneficial effect of Ni at 50 g g–1 on C. macrophylla development, probably stimulatingthe transfer of nitrogen from roots to shoots and increasing concentrations of two cofactors of enzymes, Cu andZn. We also demonstrated the capacity of C. macrophylla to accumulate Ni in roots when it is at highconcentrations in the soil environment.

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