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Plant Physiology 51:859-862 (1973)
© 1973 American Society of Plant Biologists

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Articles

Rehydration versus Growth-induced Water Uptake in Plant Tissues 1

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

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

Experiments show that the rate of water uptake by living tissues external to mature xylem of cotton stems (Gossypium hirsutum L. Auburn 7-683) is very similar to the corresponding curves for leaf tissue. In both cases one obtains a two-phase curve with phase I corresponding to passive rehydration and phase II pertaining to active growth.

A theory of water movement in plant tissue first proposed by Philip allows one to make a more rigorous distinction than made previously between phase I and phase II. This theory is applied explicitly to water uptake by leaf disks and results in a simple expression for the time required for phase I completion. Because the time required varies as the square of the disk radius, it is essential to use a standad disk size in water uptake studies of a particular tissue.

Additional analysis indicates that clear temporal distinction cannot be made between phase I and phase II. Different portions of the leaf disk rehydrate at significantly different rates, resulting in a grey zone with phase I and phase II occurring simultaneously in different parts of the disk.

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

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






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