Abstract
We have isolated protein fractions from cold-acclimated, frost-hardy cabbage (Brassica oleracea L.) and spinach (Spinacia oleracea L.) leaves which protect isolated thylakoids from non-hardy spinach against mechanical membrane rupture during an in-vitro freeze-thaw cycle. No protective activity was found in similar preparations from non-hardy leaves. The proteins protected the membranes from damage by reducing their solute permeability during freezing and by increasing their expandability during thawing. The proteins act by increasing the resistance of the membranes against the osmotic stress to which they are exposed during a freeze-thaw cycle. In the absence of cryoprotectants this stress results in membrane rupture.
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This investigation was supported by the Deutsche Forschungsge-meinschaft.
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Hincha, D.K., Heber, U. & Schmitt, J.M. Proteins from frost-hardy leaves protect thylakoids against mechanical freeze-thaw damage in vitro. Planta 180, 416–419 (1990). https://doi.org/10.1007/BF00198794
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DOI: https://doi.org/10.1007/BF00198794