Abstract
Abstract Most insects must accumulate certain metabolites before entering diapause by virtue of photoperiodic regulation. Photoperiods influence diapause beyond the maternal generation in Cotesia vestalis (Haliday) (Hymenoptera: Braconidae), which is one of the most important larval endoparasitoid of Plutella xylostella (Linnaeus) (Lepidoptera: Plutellidae). The accumulation of metabolites in the non-diapausing prepupae, adults, and eggs (before and after oviposition) in progeny from C. vestalis cultures reared at 25°C under three photoperiods (8:16, 12:12, and 16:8 (L:D) hr), along with diapausing prepupae were measured to investigate the effects of photoperiod on the accumulation of metabolites during diapause induction. Compared with those of non-diapausing prepupae, free water, trehalose, total lipid titer, and total polyol contents in diapausing prepupae showed no significant differences; but weight, bound water, total sugar, glycogen, triglyceride, and protein contents were significantly higher. Und...
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