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Mode of action of the COR15a gene on the freezing tolerance of Arabidopsis thaliana



Mode of action of the COR15a gene on the freezing tolerance of Arabidopsis thaliana



Proceedings of the National Academy of Sciences of the United States of America 95(24): 14570-14575



Constitutive expression of the cold-regulated COR15a gene of Arabidopsis thaliana results in a significant increase in the survival of isolated protoplasts frozen over the range of -4.5 to -7degree C. The increased freezing tolerance is the result of a decreased incidence of freeze-induced lamellar-to-hexagonal II phase transitions that occur in regions where the plasma membrane is brought into close apposition with the chloroplast envelope as a result of freeze-induced dehydration. Moreover, the mature polypeptide encoded by this gene, COR15am, increases the lamellar-to-hexagonal H phase transition temperature of dioleoylphosphatidylethanolamine and promotes formation of the lamellar phase in a lipid mixture composed of the major lipid species that comprise the chloroplast envelope. We propose that COR15am, which is located in the chloroplast stroma, defers freeze-induced formation of the hexagonal II phase to lower temperatures (lower hydrations) by altering the intrinsic curvature of the inner membrane of the chloroplast envelope.

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Accession: 003202851

Download citation: RISBibTeXText

PMID: 9826741

DOI: 10.2307/46577


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