College of Environmental Science and Engineering, Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin, 541001, China.
Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin, 541004, China.
Bull Environ Contam Toxicol. 2021 May;106(5):859-865. doi: 10.1007/s00128-021-03165-z. Epub 2021 Mar 8.
Three experiments were conducted to investigate the Cd tolerance and accumulation ability of a forage grass, Pterocypsela indica. P. indica accumulated 31.40 and 69.68 mg/kg Cd in roots and shoots, respectively, and plant biomass was unaffected by soil Cd as high as 50 mg/kg. Cd pollution obviously increased the Cd content of the cell wall fraction and decreased that of the soluble fraction in plant roots, but had little effect on the subcellular Cd content in plant shoots. When soil was co-contaminated by 2.29 mg/kg Cd, 526.83 mg/kg Zn, and 595.38 mg/kg Pb, P. indica accumulated 61.63 mg/kg Cd, 4261.00 mg/kg Zn, and 75.27 mg/kg Pb in plant shoots. The results indicated that P. indica mainly detoxified Cd stress by improving the fixation of Cd on the cell wall of plant roots rather than shoots. P. indica is a potential Cd accumulator that has a high phytoremediation efficiency in Cd-Zn-contaminated soil.
进行了三项实验，以研究一种饲料草——滇竹节草（Pterocypsela indica）对镉的耐受性和积累能力。滇竹节草根和茎分别积累了 31.40 和 69.68mg/kg 的镉，而高达 50mg/kg 的土壤镉对植物生物量没有影响。镉污染明显增加了植物根部细胞壁部分的镉含量，降低了可溶性部分的镉含量，但对植物茎部的亚细胞镉含量影响不大。当土壤同时受到 2.29mg/kg 的镉、526.83mg/kg 的锌和 595.38mg/kg 的铅污染时，滇竹节草在植物茎部积累了 61.63mg/kg 的镉、4261.00mg/kg 的锌和 75.27mg/kg 的铅。结果表明，滇竹节草主要通过提高植物根部细胞壁对镉的固定来解毒镉胁迫，而不是通过茎部。滇竹节草是一种潜在的镉积累植物，在镉-锌污染土壤中具有较高的植物修复效率。
