Journal
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
Volume 137, Issue -, Pages 218-224Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ecoenv.2016.12.011
Keywords
Salicylic acid; Chlorpyrifos; Wheat; Oxidative stress; Toxicity
Categories
Funding
- National Natural Science Foundation of China [41101488]
- National Natural Science Foundation of Shandong Province [ZR2016CM11]
- Advanced Talents Research Foundation of Qingdao Agricultural University [631332]
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The role of exogenous salicylic acid (SA) in protecting wheat plants (Triticum aestivum) front contamination by the insecticide chlorpyrifos was investigated in this study. The wheat plants were grown in soils with different concentrations (5, 10, 20, and 40 mg kg(-1)) of chlorpyrifos. When the third leaf emerged, the wheat leaves were sprayed with 1, 2, 4, 8, and 16 mg L-1 of SA once a day for 6 days. The results showed that wheat exposed to higher concentrations of chlorpyrifos (>= 20 mg kg 1) caused declines in growth and chlorophyll content and altered the activities of a series of antioxidant enzymes including superoxide dismutase (SOD), catalase (CAT), peroxidase (POD), and ascorbate peroxidase (APX). Interestingly, treatments with different concentrations of SA mitigated the stress generated by chlorpyrifos and improved the measured parameters to varying degrees. Furthermore, a reverse transcription and quantitative PCR experiment revealed that the activities of SOD and CAT can be regulated by their target gene in wheat when treated with SA. We also found that SA is able to block the accumulation of chlorpyrifos in wheat. However, the effect of SA was related to its concentration. In this study, the application of 2 mg L-1 of SA had the greatest ameliorating effect on chlorpyrifos toxicity in wheat plants.
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