College of Life Sciences, Nanjing Agricultural University, Nanjing, 210095, People's Republic of China.
College of Agricultural, Henan University of Science and Technology, Luoyang, 471003, People's Republic of China.
Environ Sci Pollut Res Int. 2018 Sep;25(26):26493-26503. doi: 10.1007/s11356-018-2641-7. Epub 2018 Jul 10.
Phytoremediation as an alternative strategy has been a widespread attention. The screening of enriched plants and hyperaccumulators is the key of the strategy. So this study examined the status of heavy metal pollution in molybdenum (Mo) mine soils, metal accumulation in plants growing on mine, and their tolerance strategies. The analysis of 14 soils and 27 plant samples in mining area showed that Mo, zinc (Zn), and cadmium (Cd) concentrations exceeded soil safety standards and their levels varied in 27 plant samples. Mo was the heavy pollution with an average total content of 256.1 mg/kg in soils. As Mo-enriched plants, Mo concentrations of Macleaya cordata (Willd.) R. Br. and Morus australis Poir. were 704.4 and 772.4 mg/kg, respectively. M. cordata was selected as the research material, due to its high biomass. Molybdenum significantly decreased the biomass and photosynthesis of M. cordata at high concentration (> 200 μmol/L), but its biomass and photosynthesis reached the maximum after 50 μmol/L Mo treatment, respectively. Analysis of the subcellular distribution and chemical speciation showed that Mo was distributed a certain way in the extracts and that this suggested that it may be present in cell wall and soluble fraction of roots (51.9-63.9%; 26.1-44.7%) or shoots (30.0-44.4%; 47.3-56.0%) and complexed to organic acid, pectate, oxalate, and protein. This might be responsible for the adaptation of M. cordata to Mo stress. Therefore, M. cordata could serve as a potential plant to utilize for the phytoremediation of Mo-contaminated soil.
植物修复作为一种替代策略受到了广泛关注。富集植物和超积累植物的筛选是该策略的关键。因此，本研究调查了钼矿土壤中的重金属污染状况、矿区植物对重金属的积累及其耐受策略。对矿区 14 个土壤和 27 个植物样本的分析表明，钼、锌（Zn）和镉（Cd）浓度超过了土壤安全标准，且 27 个植物样本中的含量不同。钼是一种严重的污染，土壤中的总含量平均为 256.1 mg/kg。作为钼富集植物，博落回（Macleaya cordata (Willd.) R. Br.）和桑树（Morus australis Poir.）中的钼浓度分别为 704.4 和 772.4 mg/kg。由于其生物量大，选择博落回作为研究材料。高浓度（>200 μmol/L）的钼显著降低了博落回的生物量和光合作用，但在 50 μmol/L Mo 处理后，其生物量和光合作用分别达到最大值。亚细胞分布和化学形态分析表明，钼在提取物中以一定的方式分布，这表明它可能存在于细胞壁和根（51.9-63.9%；26.1-44.7%）或茎（30.0-44.4%；47.3-56.0%）的可溶部分，并与有机酸、果胶、草酸盐和蛋白质结合。这可能是博落回适应钼胁迫的原因。因此，博落回可以作为一种潜在的植物，用于修复钼污染土壤。
