Journal
PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY
Volume 184, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.pestbp.2022.105133
Keywords
Spodoptera frugiperda; microRNA-190-5p; Chlorantraniliprole resistance; CYP6K2
Categories
Funding
- Henan Provincial Natural Science Foundation of China [222300420440]
- Project of Plant Protection Key Discipline of Henan Province [1070202190011005]
- Graduate Education Innovation Training Base Project of Henan Province [107020221005]
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This study discovered that miRNA-190-5p can suppress the expression of CYP6K2, reducing the tolerance of fall armyworm to chlorantraniliprole. These findings provide a basis for further understanding the regulatory mechanism of CYP6K2 and the role of miRNAs in regulating tolerance to chlorantraniliprole in fall armyworm.
The fall armyworm Spodoptera frugiperda (Smith) (FAA) is responsible for considerable losses in grain production, and chemical control is the most effective strategy. However, frequent insecticide application can lead to the development of resistance. In insects, cytochrome P450 plays a crucial role in insecticide metabolism. CYP6K2 is related to FAA resistance to chlorantraniliprole. However, the regulatory mechanism of CYP6K2 expression is poorly understood. In this study, a conserved target of isolated miRNA-190-5p was located in the 3' UTR of CYP6K2 in FAA. A luciferase reporter analysis showed that in FAA, miRNA-190-5p can combine with the 3'UTR of CYP6K2 to suppress its expression. Injected miRNA-190-5p agomir significantly reduced CYP6K2 abundance by 54.6% and reduced tolerance to chlorantraniliprole in FAA larvae, whereas injected miRNA-190-5p antagomir significantly increased CYP6K2 abundance by 1.77-fold and thus improved chlorantraniliprole tolerance in FAA larvae. These results provide a basis for further research on the posttranscriptional regulatory mechanism of CYP6K2 and will facilitate further study on the function of miRNAs in regulating tolerance to chlorantraniliprole in FAA.
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