Feng Jianxiang, Lin Yanyan, Yang Yao, Shen Qianqian, Huang Jianrong, Wang Shugong, Zhu Xiaoshan, Li Zufu
School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, People's Republic of China.
College of Life Science and Oceanography, Shenzhen University, Shenzhen 518060, People's Republic of China.
Ecotoxicol Environ Saf. 2018 Jan;147:306-312. doi: 10.1016/j.ecoenv.2017.08.056. Epub 2017 Sep 14.
In order to investigate the tolerance and bioaccumulation of Cd and Cu in the halophyte Sesuvium portulacastrum, seedlings were hydroponically cultured for 30 days using the modified 1/2 Hoagland nutrient solution with different concentrations of Cd (0, 5, 10, 15, and 20mgL) and Cu (0, 2.5, 5, 7.5, and 10mgL). Afterwards, the seedling height, leaf area, biomass, and mineral element contents (Fe, Mg, Cu, and Zn) in the roots, stems and leaves were measured, and the tolerance index, bioconcentration factor (BCF), transportation index, and removal rate were calculated. The effects of salinity (0‰-30‰) on the growth and bioaccumulation ability of S. portulacastrum under combined Cu/Cd (5mgL) exposure were also determined. The results showed that, with an increasing Cd concentration, the biomass and seedling height of S. portulacastrum initially increased and then decreased. The highest leaf biomass and seedlings height was observed in the 10mgL and 5mgL Cd treatment group, respectively. Salinity did not affect the biomass of S. portulacastrum but decreased Cd concentration in roots and aboveground tissues and Cu concentration in roots of S. portulacastrum. Cu treatment significantly facilitated the absorption of Mg, Cu, and Zn in roots. With an increasing Cu concentration, the Mg and Fe contents increased in the leaves of S. portulacastrum. In comparison to the above-ground portions, the root showed a higher bioaccumulation ability of Cd and Cu, with the BCF of 341.5 and 211.9, respectively. The BCF and translocation factor (TF) values indicated that S. portulacastrum was not a hyperaccumulator for Cd and Cu, but could be used as a phytostablization plant in heavy metal contaminated coastal environments.
为了研究盐生植物海马齿对镉（Cd）和铜（Cu）的耐受性及生物积累特性，采用改良的1/2霍格兰营养液，设置不同浓度的Cd（0、5、10、15和20mg/L）和Cu（0、2.5、5、7.5和10mg/L），对海马齿幼苗进行水培30天。之后，测定幼苗的株高、叶面积、生物量以及根、茎、叶中矿质元素（铁、镁、铜和锌）的含量，并计算耐受性指数、生物富集系数（BCF）、转运指数和去除率。同时还测定了盐度（0‰-30‰）对海马齿在Cu/Cd（5mg/L）复合胁迫下生长和生物积累能力的影响。结果表明，随着Cd浓度的增加，海马齿的生物量和株高先增加后降低。在Cd浓度为10mg/L和5mg/L的处理组中，分别观察到最高的叶生物量和株高。盐度对海马齿的生物量没有影响，但降低了海马齿根和地上组织中的Cd浓度以及根中的Cu浓度。Cu处理显著促进了根对镁、铜和锌的吸收。随着Cu浓度的增加，海马齿叶片中的镁和铁含量增加。与地上部分相比，根对Cd和Cu的生物积累能力更高，其BCF分别为341.5和211.9。BCF和转运因子（TF）值表明，海马齿不是Cd和Cu的超富集植物，但可作为重金属污染沿海环境中的植物稳定化植物。
