Plant Physiol. Drug Metab Dispos
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Plant Physiology 56:707-709 (1975)
© 1975 American Society of Plant Biologists

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Articles

Determination of Unfrozen Water in Winter Cereals at Subfreezing Temperatures

Lawrence V. Gusta1

Michael J. Burke2 and Amin C. Kapoor2

Crop Development Centre, Crop Science Department, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 0W0, Laboratory of Plant Hardiness, Department of Horticultural Science, University of Minnesota, St. Paul, Minnesota 55101

The freezing of water in acclimated and nonacclimated cereals was studied using pulsed nuclear magnetic resonance spectroscopy. The quantity of unfreezable water per unit dry matter was not strongly dependent on the degree of cold acclimation. In contrast, the fraction of water frozen which was tolerated by nonacclimated winter cereals and by an acclimated spring wheat (Triticum aestivum L.) was less than in acclimated hardy cereals. The freezing curves had the following form:LT = L0{Delta}Tm/T + KLT and L0 are liquid water per unit dry matter at T and 0 C, respectively. {Delta}Tm is the melting point depression and K is the liquid water which does not freeze.




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ASPB Publications PLANT PHYSIOLOGY THE PLANT CELL
Copyright © 1975 by the American Society of Plant Biologists