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Exogenous salicylic acid alleviates the accumulation of pesticides and mitigates pesticide-induced oxidative stress in cucumber plants
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  • Nan Zou,
  • Liu Ting,
  • Li Tong,
  • Zhang Yan,
  • Li Lin,
  • Liu Ke,
  • Yang Song,
  • An Shun,
  • Pan Ping
Nan Zou
Shandong Agricultural University
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Liu Ting
Shandong Agricultural University
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Li Tong
Shandong Agricultural University
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Zhang Yan
Shandong Agricultural University
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Li Lin
Shandong Agricultural University
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Liu Ke
Shandong Agricultural University
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Yang Song
Shandong Agricultural University
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An Shun
China Agricultural University
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Pan Ping
China Agricultural University
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Abstract

Salicylic acid (SA) is an important signal molecule, regulating oxidative stress response in plants. In this study, we evaluated the influences of SA (1mg L-1, 10mg L-1 and 50mg L-1) on the accumulation of clothianidin (CLO), dinotefuran (DFN) and difenoconazole (DFZ) (5mg L-1) and pesticide-induced (CLO-10mg L-1, DFN-20 mg L-1, and DFZ-10mg L-1) oxidative stress in cucumber plants. Exogenous SA at 10mg L-1 significantly reduced the half-lives of three pesticides in nutrient solution and prevented the accumulation of pesticides in roots and leaves. And the role of SA in reducing residues was related to the major accumulation sites of pesticides. By calculating the root concentration factor (RCF) and translocation factor (TF), we found that SA at 10mg L-1 reduced the ability of roots to absorb pesticides and enhanced the translocation ability from roots to leaves. Roots exposed to high concentrations of three pesticides could reduce biomass, low chlorophyll content, promote lipid peroxidation, and alter the activities of a range of antioxidant enzymes, respectively. Exogenous SA at low concentrations significantly mitigated these negative effects. Hence, we speculated that application of exogenous SA at 10 mg L-1 could effectively alleviate the accumulation of pesticides and induce stress tolerance in cucumber planting systems.