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| Effects of imidazolium-based ionic liquids with different hydrocarbon chain Length on growth of maize seedlings |
| Received:April 17, 2017 |
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| KeyWord:imidazolium-based ionic liquids;hydrocarbon chain length;maize;antioxidant enzyme |
| Author Name | Affiliation | E-mail | | YANG Miao | College of Agronomy, Northwest A & F University, Yangling 712100, China | | | HE Jun-ya | College of Agronomy, Northwest A & F University, Yangling 712100, China | | | SUN Yu-zhou | College of Agronomy, Northwest A & F University, Yangling 712100, China | | | HAN Zhao-xue | College of Life Science, Northwest A & F University, Yangling 712100, China | | | CHEN Xiao-hong | College of Life Science, Northwest A & F University, Yangling 712100, China | | | LI Ya-jun | College of Agronomy, Northwest A & F University, Yangling 712100, China | yajun3725@126.com | | WEN Xiao-xia | College of Agronomy, Northwest A & F University, Yangling 712100, China | wenxiaoxia6811@163.com |
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| Abstract: |
| Ionic liquids(ILs) are considered as ideal solvents in various chemical processes including organic synthesis, catalytic reactions, and separation engineering. However, the hazardous nature and poor biodegradability property of many ILs increase the risk of becoming potential environmental pollutants. Studies of the toxicity of ILs on crop growth could help assess the potential risks of ILs to field ecosystems. Maize has the largest planting area in China. Herein, the effects of three imidazolium-based ionic liquids([C4mim]Cl,[C6mim]Cl, and[C8mim]Cl) on the growth of maize seedlings, as well as some physiological and biochemical indexes, were analyzed. The results suggested that the three ionic liquids had significant inhibitory effects on the dry weight accumulation of maize seedling roots and shoots. According to the logistic regression equation, EC50 of ILs for inhibiting maize showed a tendency toward an inhibitory effect:[C4mim]Cl <[C6mim]Cl <[C8mim]Cl. In addition, shoots were inhibited more than roots. Antioxidant enzymes play central roles in plant defense against reactive oxygen species(ROS). The activities of antioxidant enzymes(SOD, POD, CAT, and APX) in maize roots and shoots were analyzed. Generally, the specific activity of the four antioxidant enzymes declined with an increase in IL concentration when exposed to the three ionic liquids. The contents of malondialdehyde(MDA) were significantly increased. The results indicated that oxidative stress may explain the toxic effects of imidazolium-based ILs. |
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