Pre-exposure to nitric oxide modulates the effect of ozone on oxidative defenses and volatile emissions in lima bean

Author(s)

Souza, Silvia R. ^{[1, 2]} ; Blande, James D. ^[1] ; Holopainen, Jarmo K. ^[1]

Affiliation

^[1] Univ Eastern Finland, Dept Environm Sci, FIN-70211 Kuopio - Finland

^[2] Bot Inst Sao Paulo, Dept Ecol, BR-01061970 Sao Paulo - Brazil

• Document type: Journal article
• Source: Environmental Pollution; v. 179, p. 111-119, AUG 2013.
• Web of Science Citations: 11

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. (C) 2013 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 08/03208-3 - Evaluation of the impact of ozone and its precursors on the emission of volatile organic compounds and on the antioxidant activity of leaves of model plants exposed to the controlled conditions of fumigation
• Grantee: Silvia Ribeiro de Souza
• Support Opportunities: Scholarships abroad - New Frontiers