Physiological effects of azadirachtin on acetylcholinesterase and non- specific esterases in rice weevil, Sitophilus oryzae L., corn weevil, Sitophilus zeamais Mots., flour beetle, Tribolium castaneum Herbst

Date

5-1989

Degree

Bachelor of Science in Biology

Major Course

Major in Cell Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Adelina A. Barrion

Co-adviser

Cesar Demayo

Abstract

The physiological effects of azadirachtin on acetylcholinesterase and non-specific esterase activities in three species of stored grain pests namely S. oryzae. s. zeamais and T. castaneum were determined through spectrophotometry. Results showed that the toxicity of azadirechtin on the three species varied. S. zeamais was most sensitive followed by L. castaneum and S. oryzae. with regards to the effect of azadirachtin on acetylcholinesterase activity, it was observed that there was a general decrease in ACTH production in all the species. Likewise is true on the effect of azadirachtin on the non-specific esterase activity. However, the decreases were insignificant compared with the control. Azadirachtin, therefore, affected the esterase activity in stored grain insects which, in turn directly involved in their detoxification systems. Azadirachtin could also affect the insects since acetylcholinesterase is associated with the proper functioning of the nervous system.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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