| Title: | Pre-exposure to nitric oxide modulates the effect of ozone on oxidative defenses and volatile emissions in lima bean |
| Author(s): | Souza SR; Blande JD; Holopainen JK; |
| Address: | "Department of Environmental Science, University of Eastern Finland, P.O. Box 1627, FIN-70211 Kuopio, Finland. souzasrd@gmail.com" |
| DOI: | 10.1016/j.envpol.2013.03.065 |
| ISSN/ISBN: | 1873-6424 (Electronic) 0269-7491 (Linking) |
| Abstract: | "The roles that ozone and nitric oxide (NO), the chief O(3) precursor, play in the antioxidative balance and inducible volatile emissions of lima bean were assessed. Exposure to O(3) inhibited APX, CAT, and GR, decreased GSH content and induced emissions of (E)-beta-ocimene, limonene, 1,8-cineole, linalool, (E)-4,8-dimethyl-1,3,7-nonatriene (E)-DMNT, 2-butanone and nonanal. O(3) did not induce emissions of (E)-beta-caryophyllene and appeared to reduce the antioxidative capacity of plants to a greater extent than NO and NO followed by O(3) (NO/O(3)) treatments. There were significant differences in emissions of (E)-beta-ocimene and linalool between NO/O(3) treated plants and controls, but no differences in antioxidant concentrations. A model to explain the relationships between the ascorbate-glutathione cycle and O(3) and NO inducible volatiles was proposed. Our findings suggest that prior exposure to NO modulates the oxidative effect of ozone by the process of cross-tolerance, which might regulate the antioxidative system and induction of volatile organic compounds" |
| Keywords: | Air Pollutants/metabolism/*toxicity Ascorbate Peroxidases/metabolism Catalase/metabolism Glutathione/metabolism Glutathione Reductase/metabolism Nitric Oxide/*metabolism Ozone/metabolism/*toxicity Phaseolus/drug effects/*physiology Terpenes/*analysis/meta; |
| Notes: | "MedlineSouza, Silvia R Blande, James D Holopainen, Jarmo K eng Research Support, Non-U.S. Gov't England 2013/05/15 Environ Pollut. 2013 Aug; 179:111-9. doi: 10.1016/j.envpol.2013.03.065. Epub 2013 May 10" |
