Carbon isotope analysis of acetaldehyde emitted from leaves following mechanical stress and anoxia

摘要: Although the emission of acetaldehyde from plants into atmosphere following biotic and abiotic stresses may significantly impact air quality climate, its metabolic origin(s) remains uncertain. We investigated pathway(s) responsible for production in by studying variations stable carbon isotope composition emitted during leaf anoxia or mechanical stress. Under an anoxic environment, C3 leaves produced ethanolic fermentation with a similar isotopic to bulk biomass. In contrast, initial burst wounding was 5-12 per thousand more depleted (13)C than emissions under anoxia. Due large kinetic effect pyruvate decarboxylation catalysed dehydrogenase, acetyl-CoA biosynthetic products such as fatty acids are also relative It is well known that stimulates release quantities membranes, accumulation reactive oxygen species (ROS). suggest that, wounding, acid peroxidation reactions initiated ROS. However, variety other pathways could explain our results, including conversion esterase activity aldehyde dehydrogenase.