Morph-specific diurnal variation in allatostatin immunostaining in the corpora allata of Gryllus firmus: implications for the regulation of a morph-specific circadian rhythm for JH biosynthetic rate

Journal of Insect Physiology
Barbara Stay, Anthony J Zera

Abstract

Previous studies have documented a circadian cycle in juvenile hormone (JH) biosynthesis in the long-winged, flight-capable morph, but not in the short-winged flightless morph of the cricket Gryllus firmus. One rapid and reversible inhibitor of in vitro JH biosynthesis by the corpora allata (CA) in crickets is the neuropeptide Phe-Gly-Leu/Ile-amide type of allatostatins (ASTs). To investigate the possible role of allatostatin regulation of the morph-specific circadian cycle of JH production, the quantity of this type of AST in the nerves within the CA was determined by the density of anti-AST-immunostaining in confocal images using the Image J program. The density of immunostaining was inversely related to the rate of JH biosynthesis: Immunostaining in the CA was high and did not differ between morphs early in the photophase when the in vitro rate of JH biosynthesis is low and equivalent in the morphs. However, during the end of the photophase, when the rate of JH biosynthesis rises dramatically in the flight-capable morph, but not in the flightless morph, immunostaining was significantly lower in the flight-capable compared to the flightless morph. These results indicate that morph-specific differences in delivery of AST to th...Continue Reading

References

Aug 1, 1989·Proceedings of the National Academy of Sciences of the United States of America·A P WoodheadS S Tobe
Jan 1, 1994·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·T NeuhüserK H Hoffmann
Feb 17, 2000·Annals of the New York Academy of Sciences·W G BendenaS S Tobe
Jan 1, 1997·Annual Review of Entomology·A J Zera, R F Denno
Sep 14, 2006·Annual Review of Entomology·Barbara Stay, Stephen S Tobe

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Citations

Oct 30, 2012·Journal of Insect Physiology·Guy BlochAda Rafaeli

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