-The drought response of two Populus x euramericana clones cv Dorskamp and Luisa Avanzo was investigated using potted cuttings growing in a greenhouse. The cv Dorskamp clone is known to be more tolerant than Luisa Avanzo under field conditions. Watering was withheld and several parameters followed during the onset of drought. The relation between predawn leaf water potential (Ψ wp ) and soil water content differed between clones: (i) Ψ wp tended to decline when soil water content decreased below a threshold of 0.11 v/v and 0.13 v/v for Dorskamp and Luisa Avanzo, respectively; and (ii) Ψ wp of stressed cuttings reached -3.5 MPa and -2.5 MPa for Dorskamp and Luisa Avanzo, respectively. Under well watered conditions, Luisa Avanzo had greater relative rates of increase in number of leaves and leaf growth than in Dorskamp. In response to water stress, the relative rates of increase in number of leaves and leaf growth did not significantly differ between the two clones for similar Ψ wp values. Thus, the growth advantage of Luisa Avanzo observed under control condition appeared counterbalanced by its higher susceptibility to water stress. Our results corroborated field observations on mature trees. En réponse au stress, ces paramètres ne diffèrent plus entre clones pour des Ψ wp comparables. L'avantage de croissance observé chez Luisa Avanzo en condition témoin n'apparaît plus en réponse au stress ; la plus grande sensibilité de ce clone au stress hydrique corrobore donc les observations réal-isées en conditions naturelles. stress hydrique / surface foliaire / Populus × euramericana / potentiel foliaire de base / teneur en eau du sol
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