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The effects of temperature on root and shoot hydraulic conductances ( gshoot and groot ) were investigated for Quercus robur L. saplings. In a first experiment, conductances were measured with a High Pressure Flow Meter on excised shoots and detopped root systems. The groot and gshoot increased considerably with temperature from 0–50 °C. Between 15 °C and 35 °C, gshoot and groot varied with water viscosity. In a second experiment, the impact of temperature‐induced changes in groot on sapling transpiration ( E ) and leaf water potential (Ψ leaf ) was assessed. Intact plants were placed in a growth cabinet with constant air and variable soil temperatures. E increased linearly with soil temperature but Ψ leaf remained constant. As a consequence, a linear relationship was found between E and gplant . The results illustrate the significance of gplant for the stomatal control of transpiration and the significance of temperature for tree water transport.
Cochard et al. (2000) studied this question.