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Katarina Hedlund. Foto.

Katarina Hedlund

Professor

Katarina Hedlund. Foto.

Cold acclimation and lipid composition in the earthworm Dendrobaena octaedra

Författare

  • Martin Holmstrup
  • Louise Sorensen
  • Anne-Mette Bindesbol
  • Katarina Hedlund

Summary, in English

We have investigated the lipid chemistry during cold acclimation in the freeze tolerant earthworm Dendrobaena octaedra. The dominant phospholipid fatty acids (PLFA) of D. octaedra were 20:4, 20:5 and 20:1 (50% of total PLFA) followed by 18:0, 18:1 and 18:2 omega 6,9 (25% of total PLFA). The ability to tolerate freezing in this species was acquired after acclimation at low temperature for 2-4 weeks. During this period one particular membrane PLFA, 18:2 omega 6,9, increased significantly and there was a good correlation between the proportion of this PLFA and the survival of freezing. The composition of neutral lipid fatty acids (NLFA), most likely representing storage lipids (triacylglycerides), also changed during cold acclimation so that the overall degree of unsaturation increased. Using a common-garden experiment approach, we compared lipid composition of three genetically different populations (Denmark, Finland and Greenland) that differed in their freeze tolerance. Inter-populational differences and differences due to cold acclimation in overall fatty acid composition were evident in both PLFAs and NLFAs. Specifically, the PLFAs, 20:4 and 20:5, were considerably more represented in worms from Greenland, and this contributed to a higher U1 of PLFAs in this population. (c) 2007 Elsevier Inc. All rights reserved.

Avdelning/ar

  • Biodiversitet
  • Markgruppen

Publiceringsår

2007

Språk

Engelska

Sidor

911-919

Publikation/Tidskrift/Serie

Comparative Biochemistry and Physiology A

Volym

147

Issue

4

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Ecology

Nyckelord

  • membrane phospholipids
  • earthworms
  • cold acclimation
  • freeze tolerance
  • adaptation
  • homeoviscous

Status

Published

Forskningsgrupp

  • Soil Ecology

ISBN/ISSN/Övrigt

  • ISSN: 1531-4332