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Antioxidant system responses and bioaccumulation of Zn in wetland plants under Zn stress.

YANG Jun-xing1,2, HU Jian2, LEI Mei2, YANG Jun2, Guo Jun-mei2, CAO Shao-kuan3, YE Zhi-hong1*, CAO Liu4#br#   

  1. (1 School of Life Sciences, Sun Yatsen University, Guangzhou 510006, China; 2 China Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; 3 Mengzi Agricultural Bureau, Kunming 661100, China; 4Jiyuan Institute of Envinonmental Science, Jiyuan  459000, Henan, China).
  • Online:2017-08-10 Published:2017-08-10

Abstract: Constructed wetlands are considered as an effective and lowcost technology to clean up toxic metals such as zinc (Zn) from contaminated wastewater. The effect of Zn treatment on biomass, Zn tolerance, soluble protein and antioxidant enzymes of leaves in 18 candidate wetland emergent plants grown in soils without (control, CK) and spiked with 600 and 1200 mg Zn·kg-1 were studied in a pot trial. The results showed that there were significant differences in Zn tolerance indices and accumulation among the 18 plant species. The biomass, Zn tolerance indices and leaf protein contents of the 18 plant species decreased with the increasing soil Zn concentrations. Activities of superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) in leaves of most of the 18 plant species increased with the increasing soil Zn concentrations. Zinc accumulation by the 18 plant species was strongly dependent on the plant species and soil Zn concentration. However, Zn translocation from root to shoot was generally low in the 18 plant species. Enhancement of SOD, POD and CAT activities revealed that the antioxidant system of wetland plants played an important role in alleviating Zn toxicity in the 18 plant species. The data obtained should help to select proper wetland plant species for use in remediating Zncontaminated wastewater and soils.

Key words: Elaeagnus angustifolia, climatically suitable area, MaxEnt, stable distribution area, climate change