麻疯树对镉胁迫的生理耐性及富集特征研究

研究了不同Cd浓度(0、10、25、50、100、200mg.kg-1)对麻疯树的生理指标和Cd积累特征的影响。结果表明,在土壤中的Cd≤50mg.kg-1时,麻疯树的生长未受到明显影响(P>0.05),当Cd≥100mg.kg-1时,其生长受到明显抑制(P<0.05);同时,麻疯树叶中叶绿素含量随土壤中Cd浓度的增加而下降,而其体内Cd含量则呈增加趋势,且表现根>茎>叶的富集特征;麻疯树叶中的SOD、POD活性随Cd浓度的增加呈先升高后降低趋势,而CAT活性仅在Cd为200mg.kg-1时显著增加,麻疯树叶中的MDA、脯氨酸、可溶性糖和可溶性蛋白、酸溶性巯基和谷胱甘肽含量随Cd浓度的增大呈增加趋势,这可在一定程度上缓解金属Cd对麻疯树的毒害。因此,麻疯树在重金属镉污染土壤修复方面具有一定的应用潜能。

Cadmium Physiological Tolerance and Accumulation Characteristics ofJatropha curcas L.

The physiological response to Cd and its accumulation characteristics of Jatropha curcas L.at different Cd treatments(0,10,25,50,100,200 mg·kg-1) were analysed.Although the biomass of J.curcas was no significant difference at Cd≤50 mg·kg-1 in the soil,significantly decreased at Cd≥100 mg·kg-1;With the increase of Cd concentration,the chlorophyll content of J.curcas were decreased,but the Cd content in the plant increased,which presented the following accumulation order of root> stem> leaf.With the Cd concentration increased,the antioxidant enzymes activities-Superoxide Dismutase(SOD),peroxidase(POD) was first increased and then decreased,while the Catalase(CAT) activity was clearly increased than the control at Cd = 200 mg·kg-1;Contents of Malondialdehyde(MDA),proline,soluble protein,soluble sugar,acid thiol(SH) and glutathione(GSH) in the leaves was increased with increasing of Cd concentration,which reduced the Cd toxicity to the plant in certain extent.The results suggested J.curcas had a great potential in phytoremediation of cadmium polluted soils.