Recent Topics Posters
Brodersen, Craig , Vogelmann, Thomas C. .
Absorption of Direct, Diffuse, and Low-angle Light by Plant Leaves.
Absorption profiles of direct, diffuse and low-angle light were estimated using chlorophyll fluorescence imaging coupled with integrating sphere technology in leaves of Antirrhinum majus. Absorption profiles for direct light were similar in shape to previously published profiles. Overall, diffuse and low-angle light did not penetrate as deep into leaf tissue as direct light, and the greatest differences were observed at the interface between the palisade and spongy mesophyll tissue. Diffuse and low-angle light penetration were similar, and were absorbed close to the illuminated surface while direct light absorption did not decrease as rapidly. Maximum absorption of diffuse light shifted toward the illuminated surface, suggesting a potential mismatch between light absorption profiles and photosynthetic capacity in leaves adapted to intense, collimated light. These data suggest a mechanism that may help explain decreased leaf-level photosynthetic rates under diffuse light.
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1 - University of Vermont, Plant Biology, 109 Carrigan Dr., 120B Marsh Life Science Building, Burlington, VT, 05405, USA
2 - University of Vermont, Department of Botany, 109 Carrigan Drive, Burlington, Vermont, 05405-0086, USA
Presentation Type: Recent Topics Poster
Location: Ball Room & Party Room/SUB
Date: Monday, July 28th, 2008
Time: 12:30 PM