The hormonal control of haemolymph lipid during flight in Locusta migratoria |
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Authors: | Ian Orchard Angela B. Lange |
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Affiliation: | 1. Department of Zoology, University of Toronto, Toronto, Ontario, Canada M5S 1A1;2. Department of Biology, York University, Downsview, Ontario, Canada M3J 1P3 |
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Abstract: | Fractionation of methanolic extracts of haemolymph on thin layer chromatography, followed by bioassay, has been used to measure the titres of adipokinetic hormones I and II in the haemolymph of flown locusts. These titres have been correlated with the elevation in haemolymph lipid. Haemolymph lipid elevates in a biphasic manner during locust flight. A rise in lipid occurs during the first 10 min of flight. Lipid levels then plateau between 10 and 20 min. A second, more pronounced elevation begins at 20 min and continues for up to 60 min. The titre of adipokinetic hormone I elevates 10–15 min after flight commences while that of hormone II elevates between 15–30 min. Adipokinetic hormone I contributes 80% of the activity at 30 min but only 45% at 60 min. It is suggested that the elevation in haemolymph lipid during the first 10 min of flight may not be induced by adipokinetic hormone I or II. The role of octopamine in this initial elevation is proposed and discussed. |
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Keywords: | Adipokinetic hormones lipd flight |
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