A Phytoremediation experimental set up was established by spiking the soil with varying concentrations of mercury (Hg) (Treatment: T1:10; T2:50; T3:100; T4:500 and T5:1,000 mg Hg/kg soil). Hg removal ability of the Indian mustard plant was determined after 30, 60 and 90 days of exposure. Hg accumulation trend in second and third month of exposure was root > leaf > stem, while for the 1st month it was root > stem > leaf. The highest percentage of Hg accumulation (81%) and glutathione (14 mg/kg) was observed in the plants of T4 and T5 treatment, respectively at 90 days of exposure indicating a high level of Hg stress tolerance. At 90 days of exposure the chlorophyll a content in leaves grown on Hg-free soil (control soil) was 1.8, 2.4, 2.8, 3.6 and 4.4 fold higher than T1, T2, T3, T4 and T5 treatment respectively. With increase in exposure duration, translocation factor decreased whereas bioconcentration factor increased signifying Hg is mainly accumulated in the roots. The study suggests that Brassica juncea can withstand under high Hg contamination and can show great potential to phytostabilize Hg when grown under 100 mg/kg of soil Hg without showing any significant detrimental effect on the plant.

中文翻译：

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芥菜（C. （印度芥菜）：促进汞污染土壤的植物修复的推定植物。

通过向土壤中添加不同浓度的汞（Hg）来建立植物修复实验装置（处理：T1：10； T2：50； T3：100； T4：500和T5：1,000 mg Hg / kg土壤）。在暴露30、60和90天后确定印度芥菜植物的汞去除能力。暴露第二个月和第三个月汞的积累趋势是根>叶>茎，而第一个月的汞积累趋势是根>茎>叶。在暴露的90天时，分别在T4和T5处理的植物中分别观察到了最高的Hg累积百分比（81％）和谷胱甘肽（14 mg / kg），这表明Hg胁迫耐受性很高。暴露90天后，在无汞土壤（对照土壤）上生长的叶片中叶绿素a含量分别比T1，T2，T3，T4和T5处理高1.8倍，2.4倍，2.8倍，3.6倍和4.4倍。随着暴露时间的增加，转运因子降低，而生物浓缩因子增加，表明汞主要积累在根中。该研究表明芥菜能在高汞污染下承受，并且在100 mg / kg土壤Hg下生长时显示出巨大的植物稳定Hg潜力，而对植物没有任何明显的有害作用。