Plant Physiol.
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Plant Physiology 70:418-423 (1982)
© 1982 American Society of Plant Biologists

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Structural Changes in Thylakoid Proteins during Cold Acclimation and Freezing of Winter Rye (Secale cereale L. cv. Puma) 1

Marilyn Griffith2, Gregory N. Brown and Norman P. A. Huner

Department of Forest Resources, University of Minnesota, St. Paul, Minnesota 55108, Department of Plant Sciences, University of Western Ontario, London, Ontario N6A 5B7 Canada

Thylakoids were isolated from nonhardened and cold-hardened winter rye (Secale cereale L. cv. Puma), and subjected to sodium dodecyl sulfate-polyacrylamide gel electrophoresis in the presence and absence of sulfhydryl reagents. Electrophoresis of cold-hardened rye thylakoid proteins revealed the presence of a 35 kilodalton polypeptide and the absence of a 51 kilodalton polypeptide found in nonhardened rye thylakoid proteins. The 35 kilodalton band could be induced by adding beta-mercaptoethanol to nonhardened rye thylakoid proteins, whereas the 51 kilodalton band could be formed by adding cupric phenanthroline to these same proteins. Sulfhydryl group titration showed that cold-hardened rye thylakoid proteins contained more free sulfhydryls than nonhardened rye proteins. Although amino acid analysis of thylakoid proteins revealed quantitative differences in several amino acid residues, the polarity of thylakoid proteins did not change during cold acclimation. No significant changes in sodium dodecyl sulfate-polyacrylamide gels of thylakoid proteins appeared when either nonhardened or cold-hardened plants were frozen in vivo or in vitro. However, thylakoid proteins did aggregate when frozen in the presence of beta-mercaptoethanol. Although thylakoid proteins isolated from cold-hardened rye contained more reduced thiols, a general state of reduction did not act as a cryoprotectant. It is hypothesized that conformational changes of specific proteins may be important for low temperature growth of rye.

2 Present address: Department of Botany, University of British Columbia, Vancouver, B.C. V6T 2B1 Canada.

1 This paper is a contribution from the Minnesota Agricultural Experiment Station. Journal Series Article No. 11,991.






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ASPB Publications PLANT PHYSIOLOGY THE PLANT CELL
Copyright © 1982 by the American Society of Plant Biologists