Compared water deficit response of two Populus x euramericana clones, Luisa Avanzo and Dorskamp

Abstract

-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

Different responses of two contrasting Populus davidiana populations to exogenous abscisic acid application

“…In contrast, the wet climate population, which occurs in regions with a high annual rainfall, could be assumed to utilize abundant soil water supplies and thus grow rapidly. Similar results were also reported in previous poplar studies (Brignolas et al, 2000;Marron et al, 2002).…”

“…Although much is known about physiological and morphological responses to water deficits in woody plant studies, particularly in poplar (Tschaplinski et al, 1998;Brignolas et al, 2000;Johnson et al, 2002;Amlin and Rood, 2003;Siemens and Zwiazek, 2003), few studies have focused on the relationship among drought tolerance, water-use efficiency and plant hormones.…”

Cadmium and Zinc are differentially distributed inPopulus tremula x P. albaexposed to metal excess

“…During the treatment, the stem height as well as the total leaf area was estimated as described by Brignolas et al (2000) on five replicates. The assessment of the secondary growth (cutting diameter increase) was carried out through the monitoring of the time course of the plant initial cutting diameter with an automatic point dendrometer described in Morabito et al (2006).…”

Physiological characterization and identification of genes differentially expressed in response to drought induced by PEG 6000 in Populus canadensis leaves

“…Individual leaf area was calculated using a binomial relationship which correlates leaf maximum width to leaf area (Brignolas et al, 2000). Total plant leaf area was calculated by summing individual leaf area.…”