Influences of calcium silicate on chemical forms and subcellular distribution of cadmium in Amaranthus hypochondriacus L.
Influences of calcium silicate on chemical forms and subcellular distribution of cadmium in Amaranthus hypochondriacus L.
复制标题
硅酸钙对季苋体内镉化学形态及亚细胞分布的影响。
DOI：
10.1038/srep40583
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发表时间：
2017-01-11
影响因子：
4.6
通讯作者：
Zhuang P
中科院分区：
文献类型：
--
作者：
Lu H;Li Z;Wu J;Shen Y;Li Y;Zou B;Tang Y;Zhuang P
通过盆栽试验，研究了硅酸钙（CS）对颗粒苋菜（Amaranthus hypochondriacus L. Cv）中镉（Cd）亚细胞分布和化学形态的影响。“K112”)生长在镉污染的土壤中。结果表明：籽粒苋菜干重和光合色素含量均随CS处理剂量的增加而显著增加，其中以CS3处理最高（1.65 g/kg）；与对照相比，施用3.31 g/kg CS4可显著降低籽粒苋菜根、茎和叶中Cd浓度，分别降低68%、87%和89%。在亚细胞水平上，CS处理导致了Cd的再分配，籽粒苋叶绿体和叶片中Cd含量较高，而叶片细胞壁中Cd含量较低。CS的施用提高了籽粒苋菜果胶态和蛋白质整合态Cd的比例，降低了可能与毒性有关的水溶性Cd的百分比。游离Cd离子在亚细胞区室中转变为无活性形式可能是CS减轻植物Cd毒性和积累的重要机制。
A pot experiment was conducted to investigate the effects of calcium silicate (CS) on the subcellular distribution and chemical forms of cadmium (Cd) in grain amaranths (Amaranthus hypochondriacus L. Cv. ‘K112’) grown in a Cd contaminated soil. Results showed that the dry weight and the photosynthetic pigments contents in grain amaranths increased significantly with the increasing doses of CS treatments, with the highest value found for the treatment of CS3 (1.65 g/kg). Compared with the control, application of CS4 (3.31 g/kg) significantly reduced Cd concentrations in the roots, stems and leaves of grain amaranths by 68%, 87% and 89%, respectively. At subcellular level, CS treatment resulted in redistribution of Cd, higher percentages of Cd in the chloroplast and soluble fractions in leaves of grain amaranths were found, while lower proportions of Cd were located at the cell wall of the leaves. The application of CS enhanced the proportions of pectate and protein integrated forms of Cd and decreased the percentages of water soluble Cd potentially associated with toxicity in grain amaranths. Changes of free Cd ions into inactive forms sequestered in subcellular compartments may indicate an important mechanism of CS for alleviating Cd toxicity and accumulation in plants.