An electrophoretic study of some hydrolases from an op-susceptible and an op-resistant strain of the green peach aphid, Myzus persicae (Sulz.)

Abstract

1. 1. Polyacrylamide gel electrophoresis was used to demonstrate six esterases, hydrolysing 1-naphthyl acetate, in both strains of Myzus persicae. 2. 2. The esterases were classified as cholinesterases, carboxylesterases or arylesterases depending upon their reactions with eserine sulphate and dichlorvos. 3. 3. Considerable differences were evident in the activities and mobilities of E 3 and E 4 bands (both identified as carboxylesterases) between the two strains. 4. 4. Similar differences were not observed in the phosphatases of the two strains when sodium 1-naphthyl phosphate was used as substrate.