| Title: | Transient release of oxygenated volatile organic compounds during light-dark transitions in Grey poplar leaves |
| Author(s): | Graus M; Schnitzler JP; Hansel A; Cojocariu C; Rennenberg H; Wisthaler A; Kreuzwieser J; |
| Address: | "Institut fur Ionenphysik, Leopold-Franzens-Universitat Innsbruck, A-6020 Innsbruck, Austria" |
| ISSN/ISBN: | 0032-0889 (Print) 1532-2548 (Electronic) 0032-0889 (Linking) |
| Abstract: | "In this study, we investigated the prompt release of acetaldehyde and other oxygenated volatile organic compounds (VOCs) from leaves of Grey poplar [Populus x canescens (Aiton) Smith] following light-dark transitions. Mass scans utilizing the extremely fast and sensitive proton transfer reaction-mass spectrometry technique revealed the following temporal pattern after light-dark transitions: hexenal was emitted first, followed by acetaldehyde and other C(6)-VOCs. Under anoxic conditions, acetaldehyde was the only compound released after switching off the light. This clearly indicated that hexenal and other C(6)-VOCs were released from the lipoxygenase reaction taking place during light-dark transitions under aerobic conditions. Experiments with enzyme inhibitors that artificially increased cytosolic pyruvate demonstrated that the acetaldehyde burst after light-dark transition could not be explained by the recently suggested pyruvate overflow mechanism. The simulation of light fleck situations in the canopy by exposing leaves to alternating light-dark and dark-light transitions or fast changes from high to low photosynthetic photon flux density showed that this process is of minor importance for acetaldehyde emission into the Earth's atmosphere" |
| Keywords: | Acetaldehyde/*metabolism Aerobiosis Anaerobiosis Darkness Gases/metabolism *Light Organic Chemicals/*metabolism Plant Leaves/*metabolism Populus/*metabolism Pyruvate Dehydrogenase Complex/metabolism Volatilization; |
| Notes: | "MedlineGraus, Martin Schnitzler, Jorg-Peter Hansel, Armin Cojocariu, Cristian Rennenberg, Heinz Wisthaler, Armin Kreuzwieser, Jurgen eng Research Support, Non-U.S. Gov't 2004/08/10 Plant Physiol. 2004 Aug; 135(4):1967-75. doi: 10.1104/pp.104.043240. Epub 2004 Aug 6" |
