Digestive proteolytic and amylolytic activities in Helicoverpa armigera (Lep.: Noctuidae) larvae fed on five host plants

Baghery, Fatemeh; Fathipour, Yaghoub; Naseri, Bahram

doi:10.48311/jcp.2014.1107

Digestive proteolytic and amylolytic activities in Helicoverpa armigera (Lep.: Noctuidae) larvae fed on five host plants

10.48311/jcp.2014.1107

Volume 3, Issue 2
June 2014

Pages 191-198

Authors

F. Baghery ¹

Y. Fathipour ¹

B. Naseri ²

¹ Department of Entomology, Faculty of Agriculture, Tarbiat Modares University, P. O. Box: 14115-336, Tehran, Iran.

² Department of Plant Protection, Faculty of Agriculture, University of Mohaghegh Ardabili, Ardabil, Iran.

Abstract

The cotton bollworm, Helicoverpa armigera (Hübner), is a serious pest on a wide range of economic crops in many parts of the world. In this study, digestive proteolytic and amylolytic activities of H. armigera larvae (3^rd to 5^th instars) were evaluated on five main host plants including chickpea (cv Hashem), cowpea (cv Mashhad), soybean (cv 033), navybean (cv Dehghan), and corn (cv SC 704) at 25 ± 1 °C, relative humidity of 65 ± 5% and a photoperiod of 16: 8 (L: D) hours. The results indicated that the highest enzyme activity was in 5^th instar. The highest general protease activity of 3^rd, 4^th and 5^thinstar larvae was found on corn. The larvae fed on corn had the lowest trypsin activity. This leads to hyperproduction of chymotrypsin and elastase-like enzymes to compensate the inhibition of trypsin. The larvae of H. armigera reared on cowpea had the highest level of amylase activity, and the lowest activity was in the larvae fed on corn. The results revealed that among host plants tested, corn was more resistant (unsuitable) to H. armigera. Study on digestive proteolytic and amylolytic activities of H. armigera can be used in identifying the antidigestive or antifeedent compounds, which will help us to design appropriate management programs.

Keywords

Cotton bollworm

Helicoverpa armigera

digestive enzymes

host plants

20.1001.1.22519041.2014.3.2.7.4

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