Fujian Provincial Key Lab of Coastal Basin Environment, Fujian Polytechnic Normal University, Fuqing, Fujian Province, China.
School of Biology and Chemical Engineering, Fujian Polytechnic Normal University, Fuqing, Fujian Province, China.
Int J Phytoremediation. 2021;23(10):1077-1084. doi: 10.1080/15226514.2021.1876628. Epub 2021 Jan 27.
The tolerance of plants to Cd is a scientific and interesting issue for phytoremediation. In the current study, we attempt to reveal the physiological mechanism of the tolerance of to cadmium (Cd) by using hydroponic experiments. The results showed that the Cd absorption of was dose-dependent and the absorbed Cd was mainly maintained in the root. The fresh weight was greatly affected by Cd in the early stage of aquatic cultivation. The negative effect of Cd on is dose-dependent, but might adapt to moderate Cd pollution over time. The Cd stimulated the opening of the stomata, and the cell tightness ratio of increased with rising Cd concentrations. The administration of moderate levels of Cd stimulated the release of soluble protein, free proline, malondialdehyde, and soluble polysaccharide. Cd administration also stimulated the activity of superoxide dismutase, peroxidase (POD), catalase, and ascorbic acid peroxidase of , except for POD activity at the highest Cd concentration. This indicates that the physiological mechanism of the tolerance of to Cd depends on osmotic regulation, reduction of lipid peroxidation, improvement of antioxidant properties, increasing palisade tissue while decreasing sponge tissue, and increasing stomatal conductance.
植物对 Cd 的耐受性是植物修复的一个科学和有趣的问题。在本研究中，我们试图通过水培实验来揭示对镉（Cd）耐受性的生理机制。结果表明，的 Cd 吸收呈剂量依赖性，吸收的 Cd 主要保存在根部。在水生培养的早期，Cd 对鲜重的影响很大。Cd 对的负效应呈剂量依赖性，但可能会随着时间的推移适应适度的 Cd 污染。Cd 刺激气孔张开，细胞紧密度比随着 Cd 浓度的升高而增加。适量的 Cd 处理刺激可溶性蛋白、游离脯氨酸、丙二醛和可溶性多糖的释放。Cd 处理还刺激的超氧化物歧化酶、过氧化物酶（POD）、过氧化氢酶和抗坏血酸过氧化物酶的活性，除了在最高 Cd 浓度下 POD 活性。这表明对 Cd 耐受性的生理机制依赖于渗透调节、降低脂质过氧化、提高抗氧化能力、增加栅栏组织同时减少海绵组织以及增加气孔导度。
