HR: 1330h
AN: A32A-0119    [PDF]
TI: Quantification of carbon sources for isoprene emission in poplar leaves
AU: Kreutzwieseer, J
EM: kreutzwie@uni-freiburg.de
AF: Institut fuer Forstbotanik und Baumphysiologie, Albert-Ludwig-Universitaet Freiburg, Freiburg, Georges-Koehler-Allee,, Freiburg, D-79110 Germany
AU: Graus, M
EM: martin.graus@uibk.ac.at
AF: Insitut fuer Ionenphysik, Leopold Franzens Universitaet Innsbruck, Technikerstr. 25, Innsbruck, A-6020 Austria
AU: Schnitzler, J P
EM: schnitzler@ifu.fhg.de
AF: Forschungszentrum Karlsruhe, Institut fuer Meteorologie und Klimaforschung Atmosphaerische Umweltforschung, Kreutzeckbahnstr. 19, Garmisch-Partenk., D-82467 Germany
AU: Heizmann, U
AF: Forschungszentrum Karlsruhe, Institut fuer Meteorologie und Klimaforschung Atmosphaerische Umweltforschung, Kreutzeckbahnstr. 19, Garmisch-Partenk., D-82467 Germany
AU: Rennenberg, h
EM: rennenberg@uni-freiburg.de
AF: Institut fuer Forstbotanik und Baumphysiologie, Albert-Ludwig-Universitaet Freiburg, Freiburg, Georges-Koehler-Allee,, Freiburg, D-79110 Germany
AU: * Hansel, A
EM: armin.hansel@uibk.ac.at
AF: Insitut fuer Ionenphysik, Leopold Franzens Universitaet Innsbruck, Technikerstr. 25, Innsbruck, A-6020 Austria
AB: Isoprene is the most abundant volatile organic compound emitted by plants and in particular by trees. Current interest in understanding its biosynthesis in chloroplasts is forced by the important role isoprene plays in atmospheric chemistry. Leaf isoprene formation is closely linked to photosynthesis by a dynamic use of recently fixed photosynthetic precursors in the chloroplast. Under steady state conditions in [13C]CO2 atmosphere approximately 75 % of isoprene became labeled within minutes. The source of unlabeled C is suggested to be of extra-chloroplastidic and/or from starch degradation. In order to test whether these alternative carbon sources - leaf internal C-pools and xylem-transported carbohydrates, contribute to leaf isoprene formation in poplar (Populus tremula x P. alba) on-line proton-transfer-reaction-mass spectrometry (PTR-MS) was used to follow 13C-labeling kinetics.
DE: 0315 Biosphere/atmosphere interactions
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting