| Title: | Exposure to herbicides reduces larval sensitivity to insecticides in Spodoptera litura (Lepidoptera: Noctuidae) |
| Author(s): | Liu SW; Elzaki MEA; Staehelin C; Ma ZH; Qin Z; Wang RL; |
| Address: | "Guangdong Engineering Research Center for Modern Eco-agriculture and Circular Agriculture, Guangzhou, China. Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture, South China Agricultural University, Guangzhou, China. College of Crop Science, Fujian Agriculture and Forestry University, Fuzhou, China. State Key Laboratory of Biocontrol and Guangdong Key Laboratory of Plant Resources, School of Life Sciences, Sun Yat-sen University, East Campus, Guangzhou, China" |
| ISSN/ISBN: | 1744-7917 (Electronic) 1672-9609 (Linking) |
| Abstract: | "Herbicides and insecticides are widely used in modern agriculture. It has been reported in various studies that application of insecticides can increase tolerance of herbivorous insects to insecticides. However, limited information exists on susceptibility to insecticides when insects are exposed to herbicides. This study was conducted to investigate the potential impact of the herbicides trifluralin and 2-methyl-4-chlorophenoxyacetic acid sodium salt (MCPA-Na) on the susceptibility of the nocturnal moth Spodoptera litura to the insecticides lambda-cyhalothrin, phoxim and bifenthrin. We found that larvae exposed to trifluralin or MCPA-Na became significantly less susceptible to both insecticides than non-exposed control larvae. Herbicide-treated larvae did not show altered growth under the used test conditions. However, heads of herbicide-treated larvae showed increased expression of the acetylcholinesterase genes SlAce1 and SlAce2. Moreover, the fat body and midgut of herbicide-treated larvae displayed elevated expression of detoxification genes (the carboxylesterase gene SlCarE; the glutathione S-transferase genes SlGSTe2 and SlGSTe3; the cytochrome P450 monooxygenase genes CYP6B48, CYP9A40 and CYP321B1). The CYP6B48 gene exhibited highest inducibility. In conclusion, the data of this study suggest that exposure of S. litura larvae to herbicides may stimulate detoxification mechanisms that compromise the efficacy of insecticides" |
| Keywords: | "*2-Methyl-4-chlorophenoxyacetic Acid Acetylcholinesterase/metabolism Animals Cytochrome P-450 Enzyme System/metabolism Drug Interactions Gene Expression/drug effects Genes, Insect Glutathione Transferase/metabolism *Herbicides Inactivation, Metabolic *Ins;" |
| Notes: | "MedlineLiu, Shi-Wei Elzaki, Mohammed Esmail Abdalla Staehelin, Christian Ma, Zhi-Hui Qin, Zhong Wang, Rui-Long eng 2017A030313188/Natural Science Foundation of Guangdong Province, China/ 31470576/National Natural Science Foundation of China/ Australia 2018/09/22 Insect Sci. 2019 Aug; 26(4):711-720. doi: 10.1111/1744-7917.12642. Epub 2018 Oct 25" |
