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Plant Physiology 65:635-640 (1980)
© 1980 American Society of Plant Biologists

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Articles

Soil Temperature Influences on Root Resistance of Pinus contorta Seedlings 1

Steven W. Running and C. Patrick Reid

Department of Forest and Wood Sciences, Colorado State University, Fort Collins, Colorado 80523

The influence of low temperature in the root zone on water uptake in lodgepole pine (Pinus contorta Dougl. ex Loud.) was studied under laboratory conditions. To remove soil hydraulic influences, two-year-old seedlings were transferred to solution cultures and maintained in temperature controlled water baths. Short term measurements of leaf conductance, leaf water potential and tritiated water movement were taken at root temperatures from 22 C down to 0 C. Root resistance was calculated to be 67% of total plant resistance at 7 C and 93% at 0 C. In addition an Arrhenius break was found in a plant resistance versus temperature plot, suggesting a significant change with temperature in the membrane pathway in the root water uptake system.

1 This work was funded by McIntire-Stennis Project No. 5333 through Colorado State University, National Science Foundation Grant DEB 78-05311 to Dr. Dennis Knight at the University of Wyoming, and the Forest and Mountain Meteorology Project of the Rocky Mountain Forest and Range Experiment Station, Fort Collins, Colorado.






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Copyright © 1980 by the American Society of Plant Biologists