Abstract
N-Acetyl-5-methoxytryptamine (melatonin; MEL) was detected in the testis of non-diapausing pupae and in the testis of post-diapause pharate adults of the cabbage armyworm, Mamestra brassicae, by use of a threedimensional HPLC system with multiple coulometric electrochemical detectors. Intermediates providing evidence of various metabolic pathways were identified, as follows: tryptophan (TRP) → 5-hydroxytryptophan (5-HTP) → 5-hydroxytryptamine (5-HT) → N-methyl-5-hydroxytryptamine (N-MET) ↳5-hydroxyindoleacetic acid (5-HIAA) ↳N-acetyl-5-hydroxytryptamine (N-ACET-5-HT) ↳melatonin (MEL). The possible physiological roles of melatonin in the testis of both diapausing and non-diapausing pupae are discussed.
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