Effect of cypermethrin on the free amino acids pool in an organophosphorus-insecticide-resistant and a susceptible strain of Tribolium castaneum

Abstract

1. Proline was found to be the major component of CTC-12 (44%) and FSS II (45%) strain.

2. The cypermethrin treatment resulted in an increase in most of the amino acids of sixth instar larvae and all amino acids of adult beetles of CTC 12 strain.

3. In the susceptible strain (FSS II), however, the tyrosine, phenylalanine and arginine increased, whereas serine, proline, glycine, alanine, valine, isoleucine, leucine and lysine were decreased significantly in the sixth instar larvae.

4. In the FSS II adult beetles, only aspartic acid increased, while other amino acids either decreased (threonine, proline, glycine, alanine, valine, methionine, isoleucine, tyrososine, lysine, arginine) or remained unaffected (serine, glutamic acid, leucine, phenylalanine, histidine).