硫存在下水稻幼苗中镉的积累、亚细胞分布及化学形态
Cadmium accumulation, sub-cellular distribution and chemical forms in rice seedling in the presence of sulfur.
作者信息
Zhang Wen, Lin Kuangfei, Zhou Jian, Zhang Wei, Liu Lili, Zhang Qianqian
机构信息
School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China; State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China; Shanghai Key Laboratory of Functional Materials Chemistry, East China University of Science and Technology, Shanghai 200237, China.
School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China; State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China; Shanghai Key Laboratory of Functional Materials Chemistry, East China University of Science and Technology, Shanghai 200237, China.
出版信息
Environ Toxicol Pharmacol. 2014 Jan;37(1):348-53. doi: 10.1016/j.etap.2013.12.006. Epub 2013 Dec 19.
Changes in cadmium (Cd) accumulation, distribution, and chemical form in rice seedling in the joint presence of different concentrations of sulfur (S) remain almost unknown. Therefore, the indoor experiments were performed to determine the accumulation, sub-cellular distribution and chemical forms of Cd under three S levels in rice seedling for the first time. The result showed that Cd accumulation in rice roots was more than in shoots. Sub-cellular distribution of Cd in rice roots and shoots indicated that the largest proportion of Cd accumulated in cell walls and soluble fractions. As S supply increased, the proportion of Cd in cell walls reduced, while it increased in the soluble fractions. The majority of Cd existed in inorganic form, and then gradually changed to organic forms that included pectates and proteins with increased S supply. The results showed that S supply significantly influenced Cd accumulation, distribution, and chemical forms, suggesting that S might provide the material for the synthesis of sulfhydryl protein and thereby affect Cd stress on plants. These observations provided a basic understanding of potential ecotoxicological effects of joint Cd and S exposure in the environment.
在不同浓度硫（S）共同存在的情况下，水稻幼苗中镉（Cd）的积累、分布和化学形态变化几乎无人知晓。因此，首次进行了室内实验，以确定水稻幼苗在三种硫水平下镉的积累、亚细胞分布和化学形态。结果表明，水稻根部镉的积累量大于地上部分。水稻根和地上部分镉的亚细胞分布表明，镉积累的最大比例存在于细胞壁和可溶性部分。随着硫供应的增加，细胞壁中镉的比例降低，而在可溶性部分中增加。大部分镉以无机形式存在，然后随着硫供应的增加逐渐转变为有机形式，包括果胶酸盐和蛋白质。结果表明，硫供应显著影响镉的积累、分布和化学形态，表明硫可能为巯基蛋白的合成提供物质，从而影响镉对植物的胁迫。这些观察结果为环境中镉和硫联合暴露的潜在生态毒理学效应提供了基本认识。
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