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Plant Physiology 54:173-176 (1974)
© 1974 American Society of Plant Biologists

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Articles

Water Permeability and Cold Hardiness of Cortex Cells in Cornus stolonifera Michx.—A Preliminary Report 1

J. S. McKenzie2, C. J. Weiser3, E. J. Stadelmann4 and M. J. Burke

a Laboratory of Plant Hardiness, Department of Horticultural Science, University of Minnesota, St. Paul, Minnesota 55101

The relationship of freezing resistance to water permeability of cortex cells was studied in stems of red osier dogwood (Cornus stolonifera Michx.). Permeability was estimated by determining the diffusion flux of tritiated water from cortex slices previously equilibrated in tritiated water. Energy of activation and diffusion time comparisons of tritiated water flux from living cortex slices and slices killed by immersion in liquid N2 verified that intact membranes of uninjured cortex cells limited water flux.

Water permeability of living phloem and cortical parenchyma cells increased during the initial (photoperiodically induced) phase of cold acclimation. This accompanied an increase in hardiness from –3 to –12 C. Little if any further increase in permeability was noted during subsequent acclimation to below –65 C.

Permeability measurements on nonhardy cortex samples yielded consistent results, but measurements on samples from hardy twigs were often difficult to reproduce. This unexplained variability precludes specific conclusions, but the tritiated water diffusion flux technique may provide an alternative to traditional plasmolytic techniques in studying water permeability in woody plant tissues.

2 Present address: Agriculture Canada, Research Station, Beaverlodge, Alberta, TOH OCO, Canada.

3 Present address: Department of Horticulture, Oregon State University, Corvallis, Ore.

4 Department of Horticultural Science, University of Minnesota.

1 Scientific Journal Series Article No. 8406 of the Minnesota Agricultural Experiment Station.






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Copyright © 1974 by the American Society of Plant Biologists