Hormonal Effects on the Developmental Variation of the Glucose-metabolizing Isoenzymes of the Grasshopper Caledia captiva (Orthoptera: Acrididae)
Colgan, Donald James
In Caledia captiva (Fabricius 1775), there are changes between the embryonic and adult stages in the isoenzymes mediating more than half of the steps of glycolysis. The changes between phenotypes all occur near hatching from the egg. The investigations reported here were carried out to ascertain whether juvenile hormone 1 or 20-hydroxyecdysone act as a single common cause of the phenotypic alterations. Although treatment effects were found for aldolase, a-glycerophosphate dehydrogenase and 6-phosphogluconate dehydrogenase, neither of the hormones appears to advance or retard generally the transition between phenotypes of the 6 systems studied here. The significant effects which did occur suggest that, despite the developmental coincidence of the changes, their regulation is at least partly enzyme-specific.