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Plant Physiology 65:499-501 (1980)
© 1980 American Society of Plant Biologists

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Lethal Freeze-Dehydration Injury of Dogwood Stem Tissue Does Not Change the Activation Energy of Water Permeability 1

John V. Carter and Margaret Braden

Laboratory of Plant Hardiness, Department of Horticultural Science and Landscape Architecture, University of Minnesota, St. Paul, Minnesota 55108

The Arrhenius activation energy for water permeability, ({Delta}Ea,H2O) through stem cortical tissue of red osier dogwood (Cornus sericea L.) was determined after treatments which cause membrane rupture as well as after a lethal slow freeze and subsequent slow rewarming. The latter value was higher than the former, but was indistinguishable from the {Delta}Ea,H2O found for healthy tissue. It was concluded that membrane permeability to water is not altered during the first 24 to 48 hours after exposure of nonacclimated red osier dogwood to lethal freeze dehydration injury.

1 This research was supported by the University of Minnesota Graduate School, the Minnesota Agricultural Experiment Station, and the Nerkin Foundation. Scientific Journal Series Article 10750 of the Minnesota Agricultural Experiment Station.






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Copyright © 1980 by the American Society of Plant Biologists