Title

Soil Temperature Influences on Root Resistance of Pinus contorta Seedlings

Document Type

Article

Publication Title

Plant Physiology

Publication Date

4-1980

Volume

65

Issue

4

First Page

635

Last Page

640

Abstract

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.

DOI

http:/​/​dx.​doi.​org/​10.​1104/​pp.​65.​4.​635

Rights

© 1980 American Society of Plant Biologists

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