Cd-induced system of defence in the garlic root meristematic cells
2009
Jiang, W.S.,Tianjin Normal Univ. (China). Library | Liu, D.H.,Tianjin Normal Univ. (China). Dept. of Biology | Xu, P.,Tianjin Normal Univ. (China). Dept. of Biology
Studies on cadmium effects in the root meristematic cells of Allium sativum were carried out using electron microscopy in order to explain the possible mechanisms of garlic seedlings' tolerance to Cd stress. Seedlings were treated with 0.01, 0.10 and 1.00 mM CdCl2 solutions for 0.5, 1, 2, 4, 8, 10, 12, 24 and 48 h, respectively. The results indicated that cell walls, plasma membrane and main organelles actively participated in Cd detoxification and tolerance at low Cd concentrations. Once excessive Cd ions entered the cytosol, a defence mechanism becomes activated, protecting the cells against Cd toxicity. However, under high Cd concentration in cells, the cell structure was damaged, even leading to cells death.
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