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SUBCELLULAR DISTRIBUTION AND CHEMICAL FORMS OF CADMIUM IN LEAVES OF THE HYPERACCUMULATOR PLANT Solanum nigrum L.

文献类型： 外文期刊

作者： Guo, Zhi 1 ; Yuan, Hai-yan 3 ; Chen, Liu-gen 2 ; Ao, Yan-song 1 ;

作者机构： 1.Shanghai Jiao Tong Univ, Sch Agr & Biol, Dept Plant Sci, Shanghai 200240, Peoples R China

2.Jiangsu Acad Agr Sci, Inst Agr Resource & Environm, Nanjing 210014, Jiangsu, Peoples R China

3.Inst Bot, Nanjing 210014, Jiangsu, Peoples R China

4.Chinese Acad Sci, Nanjing Bot Garden Mem Sun Yat San, Nanjing 210014, Jiangsu, Peoples R China

关键词： cadmium;solarium nigrum L.;subcellular distribution;chemical form;ascorbate-glutathione cycle

期刊名称：FRESENIUS ENVIRONMENTAL BULLETIN （ 影响因子：0.489； 五年影响因子：0.479 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Solarium nigrum L. is a newly discovered Cd-hyper-accumulator species with a large biomass and fast growth rate. Determination of Cd distribution and chemical speci-ation in S. nigrum is essential for understanding the mechanisms involved in Cd accumulation, transportation, and detoxification. In this study, S. nigrum seedlings were grown with increasing Cd concentrations (0-200 μM), and the subcellular distribution and chemical forms of Cd in different leaves were determined after 21-days exposure using differential centrifugation and sequential chemical extraction, respectively. To assess the effect of Cd hyper-accumulation on plant performance, response of the ascorbate-glutathione cycle and the effects of exogenous salicylic acid (SA) on Cd toxicity in S. nigrum seedlings were investigated. Cd exposure resulted in a higher Cd concentration in mature leaves compared with older and younger leaves, with 62-66% localized in cell walls, 26-32% in the soluble fraction, and the remainder in cellular organelles. Cd significantly influenced the concentration of reduced glutathione (GSH), oxidized glutathione (GSSG), reduced ascorbate (AsA) and oxidized ascorbate (DHA), and the activities of glutathione reductase (GR) and ascorbate peroxidase (APX) in the S. nigrum leaves, in a concentration and time-dependent manner. However, exogenous SA significantly increased the amount of GSH, AsA, and DHA, decreased malondialdehyde (MDA), and increased the activities of GR and APX.

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