Journal of Comparative Physiology A

, Volume 180, Issue 3, pp 181–185

Distribution of photoperiodic receptors in the compound eyes of the bean bug, Riptortus clavatus

  • A. Morita
  • H. Numata
ORIGINAL PAPER

DOI: 10.1007/s003590050039

Cite this article as:
Morita, A. & Numata, H. J Comp Physiol A (1997) 180: 181. doi:10.1007/s003590050039

Abstract

  The bean bug, Riptortus clavatus shows a long-day photoperiodic response with respect to the control of adult diapause. The location of photoreceptors for photoperiodism was examined in this species by complete or partial removal of photoreceptor organs. Even after one compound eye or both ocelli were removed, the insects were sensitive to photoperiod. After both compound eyes were removed, however, the insects became reproductive regardless of the photoperiod. Therefore, photoreceptors for photoperiodism were not in the ocelli but in the compound eyes. To clarify whether ommatidia in compound eyes have a regional difference in reception of photoperiod, sensitivity to photoperiod was examined after one compound eye and a part of the contralateral one were removed. Only when the central region of compound eyes was removed did the insects lose sensitivity to photoperiod. It is concluded that the ommatidia in the central region of compound eyes play a principal role in the reception of photoperiod.

Key words  PhotoreceptorPhotoperiodismAdult diapauseOmmatidiumCompound eye

Copyright information

© Springer-Verlag Berlin Heidelberg 1997

Authors and Affiliations

  • A. Morita
    • 1
  • H. Numata
    • 1
  1. 1.Department of Biology, Faculty of Science, Osaka City University, Sumiyoshi, Osaka 558, Japan Fax: +81-6/605-2574 e-mail: numata@sci.osaka-cu.ac.jpJP