Larval moulting hormone of trichophoran Hemiptera-Heteroptera: Makisterone A,not 20-hydroxyecdysone |
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Authors: | J.R. Aldrich T.J. Kelly C.W. Woods |
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Affiliation: | 1. USDA-S&E-ARS, Insect Physiology Laboratory, Bldg. 467 Beltsville, MD 20705, U.S.A.;2. USDA-S&E-ARS, Insect Reproduction Laboratory, Bldg. 306, Beltsville, MD 20705, U.S.A. |
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Abstract: | The haemolymph ecdysteroids were examined in fifth-stage larvae of Nezara viridula, Podisus maculiventris and Dysdercus cingulatus (Hemiptera-Heteroptera) using high-pressure liquid chromatography to separate the ecdysteroids and a radioimmunoassay to detect the fractionated ecdysteroids. The length of the fifth stage ranged from 5 to 8 days, and a peak in ecdysteroid titre (1700–2650 ng/ml) occurred 2–3 days prior to ecdysis to the adult. An ecdysteroid matching the retention time of makisterone A (24-methyl-20-hydroxyecdysone) was clearly present in haemolymph taken at the time of peak titre in all 3 of these true bugs, whereas little, if any, ecdysone or 20-hydroxyecdysone was detected. These data, along with previously reported data for the milkweed bug Oncopeltus fasciatus, are persuasive evidence that makisterone A is the larval moulting hormone of a group of closely related Heteroptera called the Trichophora (Lygaeoida, Pentatomoidea, Pyrrhocoroidea and Coreoidea). |
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Keywords: | Hemiptera Heteroptera makisterone A 20-hydroxyecdysone ecdysone moult ecdysis |
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