Water, Air, & Soil Pollution

, Volume 223, Issue 7, pp 4141–4152 | Cite as

Nitrate Reductase-Dependent Nitric Oxide Production Is Involved in Microcystin-LR-Induced Oxidative Stress in Brassica rapa

  • Jian Chen
  • You Ming Zhong
  • Hai Qiang Zhang
  • Zhi Qi Shi


Histochemical and biochemical approaches were used to investigate the phytotoxicity induced by microcystin-LR (MC-LR) in the shoots of Brassica rapa seedlings. MC-LR exposure was able to induce oxidative stress by triggering the over-generation of reactive oxygen species (ROS) including superoxide anion radical (O2 ) and hydrogen peroxide (H2O2) in the shoots of B. rapa. MC-LR exposure led to the significant increase in the concentration of endogenous nitric oxide (NO) in B. rapa. However, such increase was completely suppressed by the treatment with nitrate reductase (NR) inhibitor NaN3, while l-NMMA, a NO synthase (NOS) inhibitor, had only slight effect on the content of endogenous NO in MC-LR-treated plant. These data suggested that NR-dependent pathway was the main source for endogenous NO generation under MC-LR stress. Afterwards, treatment with NaN3 reduced the ROS generation, lipid peroxidation, and loss of membrane integrity in MC-LR-treated plant. MC-LR stress induced the increase in the expression of superoxide dismutase, ascorbate peroxidase, and catalase. However, such an effect could be reversed by the treatment with NaN3. These results indicate that NR-dependent NO production mediates MC-LR-induced oxidative stress by triggering the over-generation of ROS in B. rapa.


Brassica rapa Microcystin-LR Nitrate reductase Nitric oxide Oxidative stress 



This research was supported by Jiangsu Agricultural Science Innovative Founds [CX(11)4065].


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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Jian Chen
    • 1
    • 2
    • 3
  • You Ming Zhong
    • 1
    • 2
    • 3
  • Hai Qiang Zhang
    • 1
    • 2
    • 3
    • 4
  • Zhi Qi Shi
    • 1
    • 2
    • 3
  1. 1.Institute of Food Quality and SafetyJiangsu Academy of Agricultural SciencesNanjingChina
  2. 2.Key Laboratory of Food Safety Monitoring and Management of Ministry of AgricultureNanjingChina
  3. 3.Key Laboratory of Food Quality and Safety of Jiangsu Province (State Key Laboratory Breeding Base)NanjingChina
  4. 4.College of Life SciencesNanjing Agricultural UniversityNanjingChina

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