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Experientia

, Volume 44, Issue 1, pp 74–76 | Cite as

Occurrence of retinal and 3-hydroxyretinal in a possible photoreceptor of the silkworm brain involved in photoperiodism

  • K. Hasegawa
  • I. Shimizu
Short Communications

Summary

Deficiency of dietary carotenoid and vitamin A caused an absence of photoperiodic response of diapause induction in the silkworm,Bombyx mori, and an addition of vitamin A to the diet restored the response. By high pressure liquid chromatography (HPLC) a possible photoperiodic receptor of the silkworm brain was found to contain both retinal and 3-hydroxyretinal which are chromophores of insect visual pigments. These pieces of evidence suggest that a retinoid protein might function in the photoperiodic response of the silkworm.

Key words

Photoperiodism diapause vitamin A retinal 3-hydroxyretinal brain Bombyx mori 

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Copyright information

© Birkhäuser Verlag Basel 1988

Authors and Affiliations

  • K. Hasegawa
    • 1
  • I. Shimizu
    • 1
  1. 1.Research Section of Environmental Biology, Laboratory for Plant Ecological Studies, Faculty of ScienceKyoto UniversityKyotoJapan

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