Document Type : Research Paper
Authors
1
M. Sc. Student, Department of Plant Protection, Faculty of Agriculture, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran
2
Assistant Professor, Department of Plant Protection, Faculty of Agriculture, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran
3
Professor, Department of Plant Protection, Faculty of Agriculture, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran
4
Ph.D. Candidate, Department of Plant Protection, University College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran
Abstract
The tomato leaf miner, Tuta absoluta Meyrick (Lepidoptera: Gelechiidae) significantly affects the production of tomato in the world. The damage is done through the holes created in the leaves mesophile due to the larval feeding. Due to unfavorable effects of insecticides application, search for alternative control measures such as suppression of digestive enzymes using enzyme inhibitors is required. In the present study, we investigated activity, optimum pH and temperature of α-glucosidase, β-Glucosidase, α-galactosidase and β-galactosidase. Also the inhibitory effect of proteinaceous extracts of wheat, datura, chickpea, ivy and amaranthus, beside IC50 calculation, were investigated. Based on the results, α-glucosidase had the highest activity followed by β-galactosidase, α-galactosidase and β-glucosidase respectively. The optimum pH of these enzymes activity except of β-glucosidase, was 6. β-glucosidase had high activity in pH 6 with optimal pH 8. The optimal temperatures for α and β-glucosidase enzymes and α and β-galactosidase were 40, 40, 40 and 45°C, respectively. Zymogram of gel electrophoresis revealed 2, 3, 1 and 1 isoforms respectively for α and β-glucosidase and α and β-galactosidase in the digestive system. Results showed that inhibitors more affected activity of α-glucosidase and β-galactosidase. Thus the highest inhibitory rate was related to the pea proteinaceous extract.
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