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

Autor(es)

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

Afiliação do(s) autor(es)

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

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

• Tipo de documento: Artigo Científico
• Fonte: Environmental Pollution; v. 179, p. 111-119, AUG 2013.
• Citações Web of Science: 11

Resumo

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)

• Processo FAPESP: 08/03208-3 - Avaliação do impacto do ozônio e de seus precursores na emissão de compostos orgânicos voláteis e na atividade antioxidante de folhas de plantas modelo expostas a condições controladas
• Beneficiário: Silvia Ribeiro de Souza
• Modalidade de apoio: Bolsas no Exterior - Novas Fronteiras