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Journal of Experimental Botany, Vol. 51, No. 348, pp. 1255-1259, July 2000
© 2000 Oxford University Press

Original papers

Temperature effects on hydraulic conductance and water relations of Quercus robur L.

Hervé Cochard1,3, Rodolphe Martin2, Patrick Gross2 and Marie Béatrice Bogeat-Triboulot2

1 UA-PIAF, INRA, Site de Crouël, 63039 Clermont-Ferrand, France
2 INRA, Laboratoire d'Ecophysiologie Forestière, 54280 Champenoux, France

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 ({Psi}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 {Psi}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.

Key words: Water relations, temperature, hydraulic conductance, stomata, oak, Quercus robur L., Fagaceae.


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