Govarthanan Muthusamy, Kamala-Kannan Seralathan, Kim Seol Ah, Seo Young-Seok, Park Jung-Hee, Oh Byung-Taek
Division of Biotechnology, Advanced Institute of Environment and Bioscience, College of Environmental and Bioresource Sciences, Chonbuk National University, Iksan, 570 752, South Korea.
Arch Microbiol. 2016 Oct;198(8):737-42. doi: 10.1007/s00203-016-1231-7. Epub 2016 May 6.
Phytoremediation is an in situ, low-cost strategy for cleanup of the sites contaminated with heavy metals. Experiments were conducted to assess the impact of synthetic chelators and plant growth-promoting rhizosphere bacteria (Herbaspirillum sp. GW103) on heavy metal lead (Pb) uptake in Z. mays cultivated in Pb-contaminated soil. The present study investigated the Pb phytoaccumulation rate and plant antioxidant enzyme activities in Z. mays exposed to 100 mg/kg of PbNO3. The combination of gluconic acid (GA) with Herbaspirillum sp. GW103 treatment showed higher Pb solubility (18.9 mg/kg) compared with other chelators. The chemical chelators showed the significant difference in phytoaccumulation as well as antioxidant enzyme activities. The antioxidant enzymes such as catalase, peroxidase and superoxide dismutase activities changed under Pb stress. The study indicated that increased activity of antioxidant enzymes may play as signal inducers to fight against Pb.
植物修复是一种用于清理重金属污染场地的原位低成本策略。开展了实验，以评估合成螯合剂和促进植物生长的根际细菌（Herbaspirillum sp. GW103）对在铅污染土壤中种植的玉米吸收重金属铅（Pb）的影响。本研究调查了暴露于100 mg/kg PbNO₃ 的玉米中的铅植物累积率和植物抗氧化酶活性。与其他螯合剂相比，葡萄糖酸（GA）与Herbaspirillum sp. GW103处理的组合显示出更高的铅溶解度（18.9 mg/kg）。化学螯合剂在植物累积以及抗氧化酶活性方面表现出显著差异。过氧化氢酶、过氧化物酶和超氧化物歧化酶等抗氧化酶的活性在铅胁迫下发生了变化。该研究表明，抗氧化酶活性的增加可能作为对抗铅的信号诱导剂发挥作用。
