Triacylglycerol and phospholipid fatty acids of the silverleaf whitefly: Composition and biosynthesis
| Autor: | James S. Buckner, Marcia M. Hagen |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Nymph
Physiology Linolenic acid Linoleic acid Biology Biochemistry Gas Chromatography-Mass Spectrometry Hemiptera Linoleic Acid Palmitic acid chemistry.chemical_compound Animals Palmitoleic acid Carbon Radioisotopes Phospholipids Triglycerides chemistry.chemical_classification Fatty Acids alpha-Linolenic Acid Fatty acid Esters General Medicine Oleic acid chemistry Insect Science Stearic acid Polyunsaturated fatty acid |
| Zdroj: | Archives of Insect Biochemistry and Physiology. 53:66-79 |
| ISSN: | 1520-6327 0739-4462 |
| DOI: | 10.1002/arch.10086 |
| Popis: | The identification and composition of the fatty acids of the major lipid classes (triacylglycerols and phospholipids) within Bemisia argentifolii Bellows and Perring (Homoptera: Aleyrodidae) nymphs were determined. Comparisons were made to fatty acids from the internal lipids of B. argentifolii adults. The fatty acids, as ester derivatives, were analyzed by capillary gas chromatography (CGC) and CGC-mass spectrometry (MS). All lipid classes contained variable distributions of eight fatty acids: the saturated fatty acids, myristic acid (14:0), palmitic acid (16:0), stearic acid (18:0), arachidic acid (20:0); the monounsaturated fatty acids, palmitoleic acid (16:1), oleic acid (18:1); the polyunsaturated fatty acids, linoleic acid (18:2), linolenic acid (18:3). Fourth instar nymphs had 5-10 times the quantities of fatty acids as compared to third instar nymphs and 1-3 times the quantities from adults. The fatty acid quantity differences between fourth and third instar nymphs were related to their size and weight differences. The percentage compositions for fatty acids from each lipid class were the same for the pooled groups of third and fourth instar nymphs. For nymphs and adults, triacylglycerols were the major source of fatty acids, with 18:1 and 16:0 acids as major components and the majority of the polyunsaturated fatty acids, 18:2 and 18:3 were present in the two phospholipid fractions, phosphatidylethanolamine and phosphatidylcholine. Evidence was obtained that whiteflies indeed synthesize linoleic acid and linolenic acid de novo: radiolabel from (2- 14 C) acetate was incorporated into 18:2 and 18:3 fatty acids of B. argentifolii adults and CGC-MS of pyrrolidide derivatives established double bonds in the D 9,12 and D 9,12,15 positions, respectively. Arch. Insect Biochem. Physiol. 53:66-79, 2003. Published 2003 Wiley-Liss, Inc. † |
| Databáze: | OpenAIRE |
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