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Plant Physiology 65:298-304 (1980)
© 1980 American Society of Plant Biologists

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Cryoprotection by Glucose, Sucrose, and Raffinose to Chloroplast Thylakoids 1

R. Daniel Lineberger2

Peter L. Steponkus

Department of Floriculture and Ornamental Horticulture, Cornell University, Ithaca, New York 14853, Department of Agronomy, Cornell University

Differential cryoprotection is afforded to chloroplast thylakoids against freeze-induced uncoupling of cyclic photophosphorylation by equimolar concentrations of glucose, sucrose, and raffinose. This differential protective effect appears to be due to nonideal activity-concentration profiles exhibited by the sugars during freezing. When cryoprotection is analyzed as a function of the mole fraction of NaCl to which the membranes are exposed during freezing, the pattern of protection to cyclic photophosphorylation and its component reactions is not dependent upon the chemical identity of the protective solute. Cryoprotective efficiency of glucose, sucrose, and raffinose can be accounted for by proposing an activity dependent alteration in the freezing environment rather than specific solute-membrane interactions.

2 Current address: Department of Horticulture, The Ohio State University, Columbus, Ohio 43210.

1 This study represents a portion of the Ph.D. thesis of R. Daniel Lineberger.




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