CHANGES OF COMPONENT CONTENTS AND ENZYME ACTIVITIES OF MICROSOMAL MIXED FUNCTION OXIDASES IN HELICOVERPA ARMIGERA(HUBNER) DURING DIFFERENT STAGES

During several stages of Helicoverpa armigera Hübner,the contents of cytochrome P450 and cytochrome b 5 were different between KQR and HDS strains, while the developmental patterns were similar. In the 3rd instar larvae, both contents in the two strains were rather low, but they increased gradually from the 3rd instar and eventually reached a maximum in the 6th instar larvae, the contents then decreased and reached the lowest in the pupae. Monooxygenase activities of MROD and ECOD in KQR strain were different during different growing stages and showed remarkably different changing patterns. From the 3rd instar to the 6th instar larvae, MROD activity enhanced and reached the highest in the 6th instar larvae, then decreased and got to the lowest in pupae and moth, while ECOD activity did not change much and showed no specific expression during those stages.