铅对冠状毛茛氧化状态、抗氧化反应和金属积累的影响。
Effect of lead on oxidative status, antioxidative response and metal accumulation in Coronopus didymus.
机构信息
Department of Environment Studies, Panjab University, Chandigarh 160014, India.
Department of Environment Studies, Panjab University, Chandigarh 160014, India.
出版信息
Plant Physiol Biochem. 2016 Aug;105:290-296. doi: 10.1016/j.plaphy.2016.05.019. Epub 2016 May 14.
A screenhouse experiment was conducted to assay the effect of Lead (Pb) on oxidative status, antioxidative response and metal accumulation in Coronopus didymus after 6 weeks. Results revealed a good Pb tolerance and accumulation potential of C. didymus towards the increasing Pb concentrations (500, 900, 1800, 2900 mg kg(-1)) in soil. The content of Pb in roots and shoots elevated with higher Pb levels and reached a maximum of 3684.3 mg kg(-1) and 862.8 mg kg(-1) Pb dry weight, respectively, at 2900 mg kg(-1) treatment. Pb exposure stimulated electrolyte leakage, H2O2 level, MDA content and the activities of antioxidant machinery (SOD, CAT, APX, GPX and GR). However, at the highest Pb concentration, the activities of SOD and CAT declined. The H2O2 level and MDA content in roots increased significantly up to ∼500% and 213%, respectively, over the control, at 2900 mg kg(-1) Pb treatment. Likewise, concurrent findings were noticed in shoots of C. didymus, with the increasing Pb concentration. The present work suggests that C. didymus exhibited a good accumulation potential for Pb and can tolerate Pb-induced oxidative stress by an effective antioxidant defense mechanism.
进行了一项遮荫棚实验，以研究铅（Pb）对 Coronopus didymus 在 6 周后氧化状态、抗氧化反应和金属积累的影响。结果表明，C. didymus 对土壤中不断增加的 Pb 浓度（500、900、1800、2900 mg kg(-1)) 具有良好的 Pb 耐受性和积累潜力。随着 Pb 水平的升高，根和地上部分的 Pb 含量增加，在 2900 mg kg(-1)处理时，达到最大值，分别为 3684.3 mg kg(-1)和 862.8 mg kg(-1) Pb 干重。Pb 暴露刺激电解质泄漏、H2O2 水平、MDA 含量和抗氧化机制（SOD、CAT、APX、GPX 和 GR）的活性。然而，在最高 Pb 浓度下，SOD 和 CAT 的活性下降。根中的 H2O2 水平和 MDA 含量分别比对照增加了约 500%和 213%，在 2900 mg kg(-1) Pb 处理时达到最高。同样的发现也在 C. didymus 的地上部分中观察到，随着 Pb 浓度的增加。本研究表明，C. didymus 对 Pb 具有良好的积累潜力，并能通过有效的抗氧化防御机制耐受 Pb 诱导的氧化应激。
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