The identification of an aphid juvenile hormone, and its titre in relation to photoperiod |
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| Authors: | JIM HARDIE FRED C. BAKER GENE C. JAMIESON ANTHONY D. LEES DAVID A. SCHOOLEY |
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| Affiliation: | Agricultural and Food Research Council Insect Physiology Group, Department of Pure and Applied Biology, Imperial College of Science and Technology, London;*Zoecon Corporation Research Laboratories, Palo Alto, California, U.S.A. |
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| Abstract: | ABSTRACT. Whole body extractions from larval and adult apterous forms of Megoura viciae , and from adult Aphis fabae , were analysed for the known insect juvenile hormones (JHs) by a gas chromatography-mass spectrometric method. Low levels of JH III were detected in both aphid species, the first identification of a juvenile hormone from an homopteran insect. Although the mean titre in adult M. viciae is higher in long-day than in short-day reared insects (0.12±0.03 v. 0.04±0.01 ng/g), titres were variable and measurements overlapped. The results are discussed in the context of the hormonal control of aphid polymorphism and the question of identity of homopteran and hemipteran JH. |
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| Keywords: | Megoura viciae Aphis fabae juvenile hormone III aphid polymorphism homopteran/hemipteran JHs GC-MS |
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