Cyclic fluctuation of daily acetylcholine esterase activity in Spodoptera littoralis (Boisd.) moth

Document Type : Original Article

Author

Dept. of Plant Protection, Faculty of Agriculture, Moshtohor, Zagazig University

10.21608/jpces.2004.459477

Abstract

The present study was executed to assess the fluctuations of esterases and acetylcholine esterase (AChE) rhythmic activity in adult central nervous system (CNS) of the cotton leafworm Spodoptera littoralis (Boisd.). Series of the experiments dealt with esterases rhythmic in CNS and electrophysiological experiments on the tarsus sensilla were conducted. The esterases activities in either male or female heads and thorax of S. littoralis were assayed 24 times (an hour interval), 8 times (3 hours intervals), 4 times (6 hours intervals) and 2 times (12 hr intervals) in the day. The obtained results showed that the cyclic fluctuation of AChE activity was significantly higher in the head and lower in the thorax during different day times. The highest AChE daily activity levels occurred in the female and male at 4 O’clock (scotophase), while the lowest activity levels occurred at 12 O’clock (photophase). Also, results showed that the averages of AChE phase activity levels were higher in the female of 3-4 days old after ecloucion and male of 2-4 days after ecloucion. In addition, contact chemoreceptors in tarsus, sensilla showed higher sensitivity to different chemicals, i.e., sodium chloride and sucrose in the scotophase than in photophase.

Keywords

Journal of Pest Control and Environmental Sciences
Volume 12, Issue 1
2004
Pages 55-71

Files

Share

How to cite

Statistics