Conclusion
In conclusion, according to the results of this study, there was a
circadian oscillation in the activity of midgut α-amylase, lipase and
protease of cotton bollworm. Although the observed rhythmic activities
are influenced by photoperiod, it seems that these biological
rhythms are controlled, at least in part, by an intrinsic mechanism independent
of some environmental factors such as light and feeding.
Further studies are required to elucidate the underlying mechanisms
in details.