N. Z. Klyueva, D. B. Ryzhov, S. G. Karpova, and S. Ya. Reznik 2005

Influence of Phenybut on Regulation of Daily Rhythm
of Adult Eclosion in Trichogramma embryophagum Htg.
(Hymenoptera, Trichogrammatidae)

Entomological Review, Vol. 85, No. 4, 2005, pp. 347–351
 Translated from Entomologicheskoe Obozrenie, Vol. 84, No. 2, 2005, pp. 249–255.

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Phenybut is an agonist of GABAb receptors. Adults of Trichogramma embryophagum Htg. were fed with 0.5–20% solution of phenybut in 50% sugar solution. The experiments demonstrated that adult mortality during 48 h increased significantly with phenybut concentration. Thus, a dose-dependent response was revealed by enteral application of a GABAb receptor agonist. When T. embryophagum females were fed with 1% solution of phenybut in 50% sugar solution, significant changes in the daily eclosion pattern in their progeny were revealed. In particular, more intensive eclosion was observed under development at the photoperiod L : D = 12 : 12 and anticipatory (after a 2-h long scotophase) light-on in the day when eclosion was recorded. The increased sensitivity to light may be due to the phenybut effect on the serotonergic system, which controls daily rhythms.