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| Changes of oxidative stress indexes of ryegrass（Lolium perenne L.）under compound exposure to polycyclic aromatic hydrocarbons and cadmium in soil |
| Received:January 02, 2022 |
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| KeyWord:cadmium;polycyclic aromatic hydrocarbons;ryegrass;oxidative stress;antagonism |
| Author Name | Affiliation | E-mail | | LI Cheng | College of Geography and Environment, Shandong Normal University, Jinan 250358, China | | | YAO Yiming | MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China | yimingyao@nankai.edu.cn | | LI Xiaoxiao | MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China | | | CHENG Jiemin | College of Geography and Environment, Shandong Normal University, Jinan 250358, China | | | SUN Hongwen | MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China | |
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| Abstract: |
| To explore the biological effects of polycyclic aromatic hydrocarbons(PAHs)and cadmium(Cd)in soil affected by compound pollution, this study involved an exposure test by the soil culture experiment using ryegrass(Lolium perenne L.), and analyzed the changes in four typical oxidative stress indices in plants, including polyphenol oxidase(PPO), phosphoenolpyruvate carboxylase(PEPC), proline (Pro), and reduced glutathione(GSH). The results showed that with exposure to Cd only, ryegrass PPO enzyme activity decreased, PEPC enzyme activity and Pro concentration first increased and then decreased, and GSH concentration increased. In contrast, with exposure to PAH only, ryegrass PPO enzyme activity decreased, while PEPC enzyme activity and the concentrations of Pro and GSH first increased then decreased. Therefore, when exposed to single stressors(PAH or Cd), the physiological systems within the ryegrass are affected, producing an oxidative stress response. We also found that compared with Cd exposure only, the four ryegrass indices changed significantly under compound exposure to Cd and PAH. The significant downregulation of PEPC and PPO enzyme activity and the concentration of Pro and GSH may be an important indicator of compound pollution of high-concentration PAH and Cd in soil. Moreover, the four ryegrass indices generally showed antagonistic effects under compound exposure stress. This study observed that compound heavy metal pollution, specifically Cd and PAHs, had dose-effect relationship with typical plant oxidative stress indices. |
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