| Title: | Emissions of putative isoprene oxidation products from mango branches under abiotic stress |
| Author(s): | Jardine KJ; Meyers K; Abrell L; Alves EG; Yanez Serrano AM; Kesselmeier J; Karl T; Guenther A; Chambers JQ; Vickers C; |
| Address: | "Climate Science Department, Earth Science Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Rd, Building 64, Room 241, Berkeley, CA 94720, USA. kjjardine@lbl.gov" |
| ISSN/ISBN: | 1460-2431 (Electronic) 0022-0957 (Print) 0022-0957 (Linking) |
| Abstract: | "Although several per cent of net carbon assimilation can be re-released as isoprene emissions to the atmosphere by many tropical plants, much uncertainty remains regarding its biological significance. In a previous study, we detected emissions of isoprene and its oxidation products methyl vinyl ketone (MVK) and methacrolein (MACR) from tropical plants under high temperature/light stress, suggesting that isoprene is oxidized not only in the atmosphere but also within plants. However, a comprehensive analysis of the suite of isoprene oxidation products in plants has not been performed and production relationships with environmental stress have not been described. In this study, putative isoprene oxidation products from mango (Mangifera indica) branches under abiotic stress were first identified. High temperature/light and freeze-thaw treatments verified direct emissions of the isoprene oxidation products MVK and MACR together with the first observations of 3-methyl furan (3-MF) and 2-methyl-3-buten-2-ol (MBO) as putative novel isoprene oxidation products. Mechanical wounding also stimulated emissions of MVK and MACR. Photosynthesis under (13)CO2 resulted in rapid (<30 min) labelling of up to five carbon atoms of isoprene, with a similar labelling pattern observed in the putative oxidation products. These observations highlight the need to investigate further the mechanisms of isoprene oxidation within plants under stress and its biological and atmospheric significance" |
| Keywords: | Annona/*metabolism Butadienes/*metabolism Carbon Dioxide/metabolism Gas Chromatography-Mass Spectrometry Hemiterpenes/*metabolism Mangifera/*metabolism Mass Spectrometry Oxidation-Reduction Pentanes/*metabolism Photosynthesis Plant Stems/metabolism Stress; |
| Notes: | "MedlineJardine, Kolby J Meyers, Kimberly Abrell, Leif Alves, Eliane G Yanez Serrano, Ana Maria Kesselmeier, Jurgen Karl, Thomas Guenther, Alex Chambers, Jeffrey Q Vickers, Claudia eng Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. England 2013/07/25 J Exp Bot. 2013 Sep; 64(12):3697-708. doi: 10.1093/jxb/ert202. Epub 2013 Jul 23" |
