Effects of Nickel Salt Concentrations on Germination and Development of Grevillea exul var. rubiginosa

R. Chandra, A. Tyagi, M. Bouraima-Saliou, V. Léon, R. Pineau
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Abstract

Endemic plant species have been considered as one of the best means of ecological restoration of exploited mine sites in New Caledonia. These plants have the adaptability characteristics 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 germination and growth of seeds and seedlings respectively particularly root development and length in different salts of nickel (acetate, chloride and sulphate) with 0­500 ppm concentrations. 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 medium had a positive effect on germination rate as well as root length. Results suggest that it is the concentration of nickel used in the present investigation to test the germination 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.
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镍盐浓度对绿柳草发芽发育的影响
特有种植物被认为是新喀里多尼亚已开发矿区生态恢复的最佳手段之一。这些植物具有适应性特点,使它们能在蛇形土壤中茁壮成长。本文研究了不同发育阶段镍浓度对新喀里多尼亚特有种绿柳菜(Grevillea exul vars . rubiginosa)的生理影响。在控制条件下,研究了植物生命周期的前两个阶段萌发和萌发后。实验涉及培养皿中种子和幼苗的萌发和生长,特别是不同镍盐(乙酸盐、氯化物盐和硫酸盐)在0-500 ppm浓度下的根发育和长度。随着提供给种子的镍溶液浓度的增加,两个研究参数:发芽率和根长都有所下降。培养基中最低浓度为5ppm的镍对发芽率和根长都有积极的影响。结果表明,本研究采用镍的浓度来测定绿柳草的发芽率和根伸长,而不是镍的形态(盐),这是田间试验所必需的。这些结果将有助于新喀里多尼亚镍矿场地的植被恢复工作。
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