Abstract
The transverse relaxation rate of water protons of nonacclimated Hedera helix L. cv. Thorndale (ivy) bark decreased in the presence of added extracellular Ca2+, Mg2+, or CO2. Evidence that the decreased transverse relaxation rate is due to decreased plasmalemma water permeability is presented. The decrease in plasmalemma water permeability induced by Ca2+ and CO2 was less in cold-acclimated ivy bark than in nonacclimated ivy bark, indicating that the process of cold acclimation altered a functional property of the plasmalemma. It is not known if the functional change in the plasmalemma is related to the degree of plant cold hardiness or is simply a low temperature response.
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