Eur. J. Entomol. 100 (2): 301-303, 2003 | DOI: 10.14411/eje.2003.047

Photoperiodic receptor in the nymph of Poecilocoris lewisi (Heteroptera: Scutelleridae)

Ryo MIYAWAKI, Shinichi I. TANAKA, Hideharu NUMATA*
Department of Bio- and Geosciences, Graduate School of Science, Osaka City University, Osaka 558-8585, Japan;

The receptor for photoperiodism in nymphs of Poecilocoris lewisi was examined using a phosphorescent paint, which absorbs light energy and emits phosphorescence in the dark. This species shows a facultative diapause in the fifth (final) nymphal instar and its induction is primarily controlled by photoperiod in the fourth instar. The incidence of diapause in the fifth instar was determined after exposing selected regions of the body surface to a longer photophase than the rest by applying a phosphorescent paint in the fourth instar. The incidence of diapause was significantly lower in insects with their compound eyes painted than in control insects at near-critical daylengths. However, painting the central part of the head had no effect. It is concluded, therefore, that the compound eyes are the principal receptor for photoperiodism in nymphs of P. lewisi. This is the first report implicating the compound eyes in the reception of photoperiod in nymphal insects.

Keywords: Photoreceptor, photoperiodism, compound eye, nymphal diapause, Poecilocoris lewisi

Received: August 26, 2002; Revised: October 16, 2002; Accepted: November 18, 2002; Published: June 25, 2003  Show citation

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MIYAWAKI, R., TANAKA, S.I., & NUMATA, H. (2003). Photoperiodic receptor in the nymph of Poecilocoris lewisi (Heteroptera: Scutelleridae). EJE, 100(2), 301-303. doi: 10.14411/eje.2003.047
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