Cuticular lipid composition of Heliothis virescens and Helicoverpa zea pupae
1996
Buckner, J.S. | Mardaus, M.C. | Nelson, D.R.
The cuticular lipids of laboratory-reared tobacco budworms, Heliothis virescens (Fabricius), and corn earworms, Helicoverpa zea (Boddie), pupae were characterized. Quantities of cuticular lipid were greater for pupae in diapause than for non-diapausing pupae. Major cuticular lipids of H. virescens pupae were longchain n-alcohols (42%) and aldehydes (41%) with chain lengths of mainly C26, C28 and C24 in decreasing order of abundance. Lesser amounts (2-5%) of wax esters and hydrocarbons were identified. The wax ester fraction was a complex mixture of C32-C52 components composed mainly of C24-C28 n-alcohol and saturated, monounsaturated and diunsaturated fatty acid (C16-C22) moieties. For H. zea, the major fractions were wax esters (38%), hydrocarbons (19%), n-alcohols (17%), diols (16%) and lesser amounts (2-5%) of aldehydes, acetate esters of alcohols and oxoalcohols. Triacontanyl hexadecanoate comprised 85% of the wax ester fraction. The H. zea alcohols, alcohol ester moieties and aldehydes consisted of a homologous series of C28-C32 compounds with the 30 carbon chain length as major constituents. The H. zea diols were C30-C36 even-chain n-alcohols with hydroxyl groups on carbon numbers 11, 12, 13, 14 or 15. Mass spectral analysis indicated the presence of unsaturation in the alkyl chain of the major diol components.
Afficher plus [+] Moins [-]Mots clés AGROVOC
Informations bibliographiques
Cette notice bibliographique a été fournie par National Agricultural Library
Découvrez la collection de ce fournisseur de données dans AGRIS