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Endemic plant species have been considered as one o f the best means of ecological restoration of explo ited mine sites in New Caledonia. These plants have the adaptability chara cteristics that allow them to thrive on serpentine soils. This study has investigated the physiological effects of nickel concentrations at different developmental stages on Grevillea exul var. rubiginosa an endemic New Caledonian species. The first two stages of a plant life cycle germination and post germination under controlled conditions were studied. The experiment involved Petri dish germina tion and growth of seeds and seedlings respectively particularly root development and length in different salts of nickel (acetate, chloride and sulphate) with 0 - 500 ppm concentratio ns. Decrease in both studied parameters: germination rates and root lengths were observed with increasing concentrations of nickel solutions supplied to seeds. A minimum concentration of 5 ppm of nickel in the med ium had a positive effect on germination rate as we ll as root length. Results suggest that it is the concentration of nickel used in the present investigation to test the germinati on rate and root elongation in Grevillea exul var. rubiginosa which are essential for experimental work in the field rather than the form (salt) of nickel. These results will be help-full in re-vegetation efforts of nickel mining sites in New Caledonia.

Effects of nickel salt concentrations on germination and development of Grevillea exul var. rubiginosa