Cold acclimation and cryoprotectants in a freeze-tolerant Antarctic nematode, Panagrolaimus davidi

Wharton, D. A.; Judge, K. F.; Worland, M. R.. 2000 Cold acclimation and cryoprotectants in a freeze-tolerant Antarctic nematode, Panagrolaimus davidi. Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology, 170 (4). 321-327.

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Panagrolaimus davidi is a freeze-tolerant Antarctic nematode which survives extensive intracellular freezing. This paper describes the development of culture techniques which provide clean samples, with a high degree of freeze tolerance and in sufficient quantities for the analysis of potential cryoprotectants. Cultures grown at 20 °C survived a short-term freezing stress but survival declined with the time spent frozen. Acclimation of cultures at 5 °C enhanced the long-term survival of freezing. Starvation, however, reduced the nematode's ability to survive short-term freezing. The principal cryoprotectants detected by gas chromatography were trehalose and glycerol. The levels of trehalose, but not those of glycerol, increased significantly after acclimation. Trehalose may stabilise membranes and protect them against the dehydrating effects of the osmotic stresses resulting from freeze concentration effects but other factors, such as recrystallisation inhibition, may be involved in long-term survival.

Item Type: Publication - Article
Digital Object Identifier (DOI):
Programmes: BAS Programmes > Pre 2000 programme
ISSN: 0174-1578
Additional Keywords: Panagrolaimus davidi, Antarctic nematode, cryoprotectants, intracellular freezing, trehalose, glycerol, freeze tolerance
Date made live: 24 Jul 2013 14:14 +0 (UTC)

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