Journal Article

Temperature effects on hydraulic conductance and water relations of <i>Quercus robur</i> L.

Hervé Cochard, Rodolphe Martin, Patrick Gross and Marie Béatrice Bogeat‐Triboulot

in Journal of Experimental Botany

Volume 51, issue 348, pages 1255-1259
Published in print July 2000 | ISSN: 0022-0957
Published online July 2000 | e-ISSN: 1460-2431 | DOI: http://dx.doi.org/10.1093/jexbot/51.348.1255
Temperature effects on hydraulic conductance and water relations of Quercus robur L.

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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 (Ψleaf) was assessed. Intact plants were placed in a growth cabinet with constant air and variable soil temperatures. E increased linearly with soil temperature but Ψleaf 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.

Keywords: Water relations; temperature; hydraulic conductance; stomata; oak; Quercus robur L.; Fagaceae.

Journal Article.  3116 words.  Illustrated.

Subjects: Plant Sciences and Forestry

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