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| The effect of exogenous salicylic acid on alleviating cadmium toxicity in tomato plants |
| Received:July 16, 2019 |
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| KeyWord:salicylic acid;cadmium;tomato;active oxygen;antioxidant system |
| Author Name | Affiliation | E-mail | | WANG Xiao-hong | School of Environmental Science and Engineering, Shaanxi University of Science & Technology, Xi'an 710021, China | | | GUO Jun-kang | School of Environmental Science and Engineering, Shaanxi University of Science & Technology, Xi'an 710021, China | frankerry@163.com | | JIA Hong-lei | School of Environmental Science and Engineering, Shaanxi University of Science & Technology, Xi'an 710021, China | | | LI Yan-ping | School of Environmental Science and Engineering, Shaanxi University of Science & Technology, Xi'an 710021, China | | | Lü Xin | School of Environmental Science and Engineering, Shaanxi University of Science & Technology, Xi'an 710021, China | | | REN Qian | School of Environmental Science and Engineering, Shaanxi University of Science & Technology, Xi'an 710021, China | |
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| Abstract: |
| This study investigated the effect of exogenous salicylic acid(SA)on tomato plants'resistance to cadmium(Cd)stress under greenhouse hydroponic conditions, and evaluated tomato plant growth, Cd accumulation, root reactive oxygen species, and antioxidant enzyme system after exposing tomatoes to Cd after pretreatment with SA. The results showed that the inhibition of Cd on tomato growth was aggravated with increased Cd concentrations. However, pretreatment with 100 μmol·L-1 SA significantly attenuated the toxicity of Cd on tomato plants. Following SA pretreatment, the plant height and root length of the tomato plants exposed to 5 mg·L-1 Cd increased by 10.2% and 14.2%, respectively, and the dry weight of the roots, stems, and leaves increased by 40%, 27.2%, and 24%, respectively(P<0.05). Meanwhile, SA significantly reduced the content of malondialdehyde(MDA)and increased the activity of antioxidant enzymes of the tomato plants exposed to Cd. In addition, after SA pretreatment, the Cd accumulation in tomato shoots decreased by between 24.4% to 58.3%, and by between 50.5% to 75.5% in the roots(P<0.05). This study shows that 100 μmol·L-1 SA pretreatment can significantly alleviate the toxicity of Cd stress and reduce the Cd accumulation in tomato plants. |
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