Changes in petiole hydraulic properties and leaf water flow in birch and oak saplings in a CO2-enriched atmosphere |
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Authors: | Eguchi Norikazu Morii Noriko Ueda Tatsushiro Funada Ryo Takagi Kentaro Hiura Tsutom Sasa Kaichiro Koike Takayoshi |
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Affiliation: | Graduate School of Agriculture, Hokkaido University, Sapporo 060-8589, Japan. |
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Abstract: | Water relations in woody species are intimately related to xylem hydraulic properties. High CO(2) concentrations ([CO(2)]) generally decrease transpiration and stomatal conductance (g(s)), but there is little information about the effect of atmospheric [CO(2)] on xylem hydraulic properties. To determine the relationship between water flow and hydraulic structure at high [CO(2)], we investigated responses of sun and shade leaves of 4-year-old saplings of diffuse-porous Betula maximowicziana Regel and ring-porous Quercus mongolica Fisch. ex Ledeb. ssp. crispula (Blume) Menitsky grown on fertile brown forest soil or infertile volcanic ash soil and exposed to 500 micromol CO(2) mol(-1) for 3 years. Regardless of species and soil type, elevated [CO(2)] consistently decreased water flow (i.e., g(s) and leaf-specific hydraulic conductivity) and total vessel area of the petiole in sun leaves; however, it had no effect on these parameters in shade leaves, perhaps because g(s) of shade leaves was already low. Changes in water flow at elevated [CO(2)] were associated with changes in petiole hydraulic properties. |
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