학술논문
Changes in light and dark periods affect the arylalkylamine N-acetyl transferase, melatonin activities and redox status in the head and hemolymph of nocturnal insect Spodoptera litura.
Document Type
Article
Source
Subject
*SPODOPTERA littoralis
*ARYLALKYLAMINE N-acetyltransferase
*MELATONIN
*OXIDATION-reduction reaction
*HEMOLYMPH
*CIRCADIAN rhythms
*INSECTS
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Language
ISSN
0929-1016
Abstract
The present study was conducted to describe the impact of circadian rhythm on melatonin levels and redox statusunder three photoperiods (12L:12D, 0L:24D, and 24L:0D) in head and hemolymph ofSpodoptera litura. Melatonin is an powerful antioxidant and controls the reproduction of organisms. In this study, melatonin levels, Arylalkylamine N-acetyltransferase(AA-NAT), and antioxidant enzyme activities were analyzed. Results showed melatonin, AA-NAT levels in hemolymph were significantly (p < 0.05) higher during the dark period than during LL regime. HPLC chromatogram of the insect head and hemolymph showed 5 peaks while hemolymph showed 6 peaks in LD, and LLregimes. The day–night changes of melatonin increased the antioxidant enzymes (GST, CAT, POX) persisted in the insect hemolymph, but were suppressed by constant light. The present study leads us to speculate that synthesis and release of melatonin in theS.liturahead occur as circadian rhythm and light has an inhibitory effect on melatonin synthesis. [ABSTRACT FROM AUTHOR]