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Diapause induces changes in the composition and biophysical properties of lipids in larvae of the European corn borer, Ostrinia nubilalis (Lepidoptera: Crambidae)

Vukašinović, Elvira L.; Pond, David W.; Worland, Michael Roger; Kojić, Danijela; Purać, Jelena; Blagojević, Duško P.; Grubor-Lajšić, Gordana. 2013 Diapause induces changes in the composition and biophysical properties of lipids in larvae of the European corn borer, Ostrinia nubilalis (Lepidoptera: Crambidae). Comparative Biochemistry and Physiology Part B: Biochemistry and Molecular Biology, 165 (4). 219-225. 10.1016/j.cbpb.2013.05.001

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Abstract/Summary

This study compares the composition and biophysical properties of lipids in non-diapausing and diapausing fifth instar larvae of Ostrinia nubilalis Hubn. (Lepidoptera: Crambidae). The majority of fat body lipids in both of these physiological states were comprised of ~ 90% triacylglycerols (TAGs), whereas the haemolymph contained a more even distribution of all lipid classes. The fatty acid composition and biophysical properties of the fat body lipids differed markedly between non-diapausing and diapausing larvae. Diapause was associated with a dramatic increase in the proportions of palmitoleic acid (16:1n-7) and oleic acid (18:1n-9), with concurrent reductions in palmitic acid (16:0) and linoleic acid (18:2n-6). The increase in the level of unsaturation of the fat body lipids, which caused a marked shift in their phase transitions to lower temperatures, was triggered by diapause rather than low temperatures. Adjustments of fatty acid compositions are likely to be an important component of winter diapause mechanisms, possibly maintaining the fluidity of cell membranes and the functionality of the organism during lower winter temperatures.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/j.cbpb.2013.05.001
Programmes: BAS Programmes > Polar Science for Planet Earth (2009 - ) > Ecosystems
ISSN: 10964959
Additional Keywords: Insect diapause; Cold hardiness; Ostrinia nubilalis; Lipid classes and fatty acid composition; Phase transition temperatures of lipids
Date made live: 14 Jun 2013 11:08 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/502258

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