| Abstract Detail
Ecophysiology Siebers, Matthew [1], Burg, Aaron [1], Wise, Robert [1]. Effect of growth CO2 concentration on leaf anatomical characteristics in aspen and birch. Tropospheric carbon dioxide concentrations have been shown to affect the development and anatomy of mesophytic leaves. In particular, elevated CO2 (i.e. 500 to 1200 ppm) has been reported to increase leaf thickness (Oksanen et al. 2001. Environ Poll 115:437) and decrease (Ceulemans et al. 1995. New Phytol 131:99) or have no effect on (Radoglou and Jarvis. 1990. Ann Bot 65:627; Tricker et al. 2005. Oecologia 143:652) stomatal density. We examined this issue by collecting aspen (Populus tremuloides genotypes 8L, 42E and 216) and birch (Betula papyrifera) leaf samples from ambient (360 ppm; aCO2) and elevated (560 ppm; eCO2) treatments at the Aspen FACE site in northern Wisconsin during the 2005 and 2006 growing seasons. Leaf thickness, the ratio of leaf area to mesophyll area (Ames/A) and stomatal density were examined using light and scanning electron microscopy. Leaf thickness responded minimally to eCO2 growth conditions. However, when there was a response, it was late in the growing season and eCO2 leaves were thinner than aCO2 leaves. Values of Ames/A did not differ between or among the three aspen genotypes measured (birch was not measured). Aspen and birch leaves grown under aCO2 had a higher stomatal density than those grown under eCO2, a finding that is in contrast with many in the literature.
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1 - University of Wisconsin Oshkosh, Department of Biology, Oshkosh, WI, 54901, USA
Keywords:
leaf morphology
Elevated CO2
stomatal density.
Presentation Type: Poster:Posters for Topics
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P69008
Abstract ID:1725 |
