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《Journal of Anhui Agricultural Sciences》 2008-33
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Study on Distribution and Chemical Characteristics of Copper in Cells of Setcreasea purpurea Boom.

HUANG Chang-gan et al(Jiangxi Agricultural University,Nanchang,Jiangxi 330045)  
[Objective] The aim of this study was to reveal the mechanism of copper hyper-accumulator in Setcreasea purpurea Boom.from the angle of distribution characteristics and binding form of copper in tissue cells.[Method] The subcellular distribution characteristics of copper in S.purpurea was studied by the technique of differential centrifugation,and the binding form of copper in roots and leaves of S.purpurea was also investigated by the sequential chemical extraction method and the enzymolysis method.[Result] copper in roots mainly distributed in the cell wall which was accounting for one third of the total copper in roots,while copper in leaves mainly distributed in the chloroplast which was accounting for a quarter to the total copper in leaves.Under the high concentration of copper or the extended treatment duration,the translocation of copper in root cells into the cell wall increased but the translocation of copper in root cells into the plastid decreased,while the translocation of copper in leaf cells into the chloroplast increased but the translocation of copper in leaf cells into the cell wall decreased.copper in leaves was mainly combined with amino acid,small molecular polymeric pigments,protein and polysaccharide,while copper in roots was mainly combined with cell wall substances such as cellulose and membrane-bound protein.[Conclusion] The distribution characteristics and binding form of copper in cells is possibly one of the dominant mechanisms for copper hyper-accumulator in S.purpurea.
【Fund】: 国家自然科学基金(30760021);; 江西省自然科学基金(0530016);; 江西省教育厅资助项目(赣教技字[2007]151号)
【CateGory Index】: S682.36
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