Arango, Adriana , Zwiazek, Janusz , Thomas, Barb , Tyree, Mel .
Relationship between stomatal closure, and xylem vulnerability to cavitation in poplars.
Xylem vulnerability to cavitation and other related drought resistance parameters were measured in balsam poplar (Populus balsamifera) and five different hybrid poplar clones. Plants were subjected to mild and severe drought stress levels followed by stress recovery and leaf water potentials and stomatal conductance were measured. In a second experiment, pressure-volume curves were used a) to examine turgor potentials at different hydration levels and b) to determine cell wall elasticity properties in the different clones. For all plants, xylem vulnerability to cavitation was positively correlated with stomatal sensitivity to drought. The poplars showing less susceptibility to xylem cavitation included P. balsamifera and P. balsamifera x P. deltoides (Jackii hybrid). Other hybrid poplars including P. balsamifera x P. simonii, P. deltoides x P. x petrowskyana and progeny of P. deltoides x P. x petrowskyana were found to have the stem xylem more susceptible to xylem cavitation and their stomata closed early in response to drought stress. The differences in water potential at the turgor loss point and cell elasticity in the poplars were also correlated with other drought resistance and drought recovery characteristics.
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1 - University of Alberta, Renewable Resources, 442 Earth Science Building. Faculty of Agriculture, Forestry and Home Economics. University of Alberta, Edmonton, Alberta, T6G 2E3, Canada
2 - University of Alberta, Renewable Resources
Presentation Type: Plant Biology Abstract
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM