Plant Physiol.
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Plant Physiology 52:565-568 (1973)
© 1973 American Society of Plant Biologists

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Temperature Effects on Radial Propagation of Water Potential in Cotton Stem Bark 1

Betty Klepper2, Fred J. Molz and Curt M. Peterson

a Departments of Botany and Microbiology and of Civil Engineering, Auburn University, Auburn, Alabama 36830

Low temperature affects the lateral movement of water across the xylem-phloem boundary in intact cotton stems. There is a reduction in the effective diffusion coefficient relating free energy flux to water potential gradients with an associated increase in resistance to water flow. Detached phloem and excised leaves do not show this effect of low temperature. Experiments on stem section halves indicate that the effect is probably associated with the cambial region.

2 Present address: Ecosystems Department, Battelle Pacific Northwest Laboratories, Richland, Wash. 99352.

1 This study was supported in part by Alabama Project 5-863, Alabama Agricultural Experiment Station, Auburn University, Auburn, Ala. 36830.






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ASPB Publications PLANT PHYSIOLOGY THE PLANT CELL
Copyright © 1973 by the American Society of Plant Biologists