Characterization of Two UDP-Glycosyltransferase Genes in Grapholita molesta and Their Detoxification Roles Against...

Area of Science:

• Entomology
• Molecular Biology
• Biochemistry

Background:

• Grapholita molesta is a significant agricultural pest.
• UDP-glycosyltransferases (UGTs) are vital detoxification enzymes in insects.
• The specific roles of G. molesta UGTs in insecticide metabolism were previously unknown.

Purpose of the Study:

• To clone and characterize two UGT genes (UGT40BA1 and UGT46A28) from G. molesta.
• To investigate the expression patterns of these UGT genes.
• To determine the involvement of these UGTs in insecticide detoxification.

Main Methods:

• Gene cloning and phylogenetic analysis.
• Quantitative real-time PCR for gene expression analysis.
• Insect susceptibility assays with UGT inhibition.

Main Results:

• UGT40BA1 and UGT46A28 were cloned and phylogenetically analyzed.
• Gene expression varied across developmental stages and tissues, with high midgut expression in adults.
• Imidacloprid and lambda-cyhalothrin significantly affected gene expression, while avermectin did not.
• Inhibiting UGT activity increased G. molesta susceptibility to insecticides.

Conclusions:

• UGT40BA1 and UGT46A28 are likely involved in the detoxification of imidacloprid, lambda-cyhalothrin, and avermectin in G. molesta.
• These findings provide insights into insecticide resistance mechanisms in this pest.
• Understanding UGT function is critical for developing effective pest management strategies.