STUDING OF DIGESTIVE ENZYMES ACTIVITY AND MAIN METABOLITES OF Agrotis ipsilon (HUFN.) AND Helicoverpa armigera (HBN.) LARVAE IN RESPONSE TO KININ- PEPTIDE

Salem,, M. S.; El-Maasarawy, S. A. S.; Abd El-Khalek, Samah M.

doi:10.21608/jppp.2007.219461

STUDING OF DIGESTIVE ENZYMES ACTIVITY AND MAIN METABOLITES OF Agrotis ipsilon (HUFN.) AND Helicoverpa armigera (HBN.) LARVAE IN RESPONSE TO KININ- PEPTIDE

Document Type : Original Article

Authors

¹ Economic Entomology Dept., Faculty of Agricultural , Cairo University

² Plant Protection Research Institute, ARC, Dokki, Giza, Egypt

10.21608/jppp.2007.219461

Abstract

Kinin-peptides are a group of structurally related neuropeptides stimulating gut motility and fluid by Malpighian tubules in insects. For studying the effect of these neuropeptides on digestive enzymes activities and concentration of main hemolymph components, leucokinin II was injected into Agrotis ipsilon (Hufn.) and Helicoverpa armigera (Hbn.)5^thinstar larvae at doses of 20, 25, 30 and 40 µl. The neuropeptide leucokinin II reduced the release of digestive enzymes, protease, amylase and trehalase; also, it inhibited the formation of total protein. While it exerted a stimulatory effect by increasing the activity of invertase enzyme and the formation of total carbohydrates and total lipid in both A. ipsilon and H. armigera larvae.