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| Mitigation of Different Forms of Exogenous Nitrogen on Cd Toxicity to Solanum nigrum |
| Received:January 07, 2015 |
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| KeyWord:nitrogen;Solanum nigrum;cadmium stress;mitigation;AsA-GSH cycle |
| Author Name | Affiliation | E-mail | | JIANG Ting | College of Landscape Architecture, Sichuan Agricultural University, Chengdu 611130, China | | | JIANG Bei-bei | College of Landscape Architecture, Sichuan Agricultural University, Chengdu 611130, China | | | PAN Yuan-zhi | College of Landscape Architecture, Sichuan Agricultural University, Chengdu 611130, China | scpyzls@163.com | | TAN Miao | College of Landscape Architecture, Sichuan Agricultural University, Chengdu 611130, China | | | ZHANG Meng-qi | College of Landscape Architecture, Sichuan Agricultural University, Chengdu 611130, China | | | YANG Ya-nan | College of Landscape Architecture, Sichuan Agricultural University, Chengdu 611130, China | | | LIU Shi-liang | College of Landscape Architecture, Sichuan Agricultural University, Chengdu 611130, China | |
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| Abstract: |
| Cadmium(Cd) pollution poses a serious risk to human health. Solanum nigrum is a Cd-hyperaccumulator. However, Cd absorption by Solanum nigrum may be affected by different forms of exogenous nitrogen. Here we did an experiment in greenhouse to investigate the effects of different forms of exogenous nitrogen(NO3--N[NaNO3]、NH4+-N[(NH4)2SO4] and NH4+-N+NO3--N [NH4NO3]) on Solanum nigrum seedlings exposed to 40 mg·kg-1 Cd in soil. At certain concentrations, different forms of exogenous nitrogen significantly relieved the Cd stress on Solanum nigrum treatment. Under Cd stress, the CAT and POD activities of Solanum nigrum leaves were significantly reduced, but SOD activity increased at first and then reduced by different concentrations of NO3--N. Exogenous NH4+-N increased CAT activity at first and reduced then; however, POD activity was gradually increased but SOD activity reduced by NH4+-N. Applying NH4+-N+NO3--N increased CAT and SOD activities, while led to a rise and then reduction in POD activity. Superoxide anion production rate, GR activity, H2O2 and MDA content of Solanum nigrum leaves under Cd stresses were significantly lower in exogenous nitrogen treatment than in no-nitrogen treatment. Exogenous nitrogen increased AsA content and APX activity, compared with those of no exogenous nitrogen treatment, Low concentrations of NO3--N increased GSH content. The experimental results show that NH4+-N is more effective in mitigating Cd stress of Solanum nigrum than others. |
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