黄酮类化合物改良对白骨壤根系中镉吸收的影响。
The influence of flavonoid amendment on the absorption of cadmium in Avicennia marina roots.
作者信息
Li Jian, Lu Haoliang, Liu Jingchun, Hong Hualong, Yan Chongling
机构信息
Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen 361102, China.
Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen 361102, China.
出版信息
Ecotoxicol Environ Saf. 2015 Oct;120:1-6. doi: 10.1016/j.ecoenv.2015.05.004. Epub 2015 May 22.
Flavonoid is a key factor for the tolerance to cadmium in plants. Concentration-dependent kinetics experiment was conducted to investigate the influence of flavonoid amendment on the Cd(2+) uptake in Avicennia marina (Forsk) Vierh. roots. We found that compared with the control, saturation concentration and maximal absorption rate of Cd was higher under flavonoid amendment (p<0.05). When roots were exposed to ion transport inhibitor (LaCl3), flavonoid amendment also facilitated Cd transport in roots. Flavonoids had no influence on Cd(2+) uptake in root cell walls. In conclusion, flavonoids enhance the tolerance to Cd and have a significant stimulative effect on symplasm transport of Cd in A. marina roots. Ca(2+)-channel was not the unique means of symplasm transport for Cd(2+) absorption.
类黄酮是植物对镉耐受性的关键因素。进行了浓度依赖性动力学实验，以研究类黄酮添加对白骨壤（Avicennia marina (Forsk) Vierh.）根系吸收Cd(2+)的影响。我们发现，与对照相比，添加类黄酮后Cd的饱和浓度和最大吸收速率更高（p<0.05）。当根系暴露于离子运输抑制剂（LaCl3）时，添加类黄酮也促进了根系中Cd的运输。类黄酮对根细胞壁吸收Cd(2+)没有影响。总之，类黄酮增强了对Cd的耐受性，并对白骨壤根系中Cd的共质体运输具有显著的刺激作用。Ca(2+)通道不是Cd(2+)吸收共质体运输的唯一途径。
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