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Reactive Oxygen Species Are Involved in Brassinosteroid-Induced Stress Tolerance in Cucumber
Plant physiology (Bethesda), 2009-06, Vol.150 (2), p.801-814
2009

Details

Autor(en) / Beteiligte
Titel
Reactive Oxygen Species Are Involved in Brassinosteroid-Induced Stress Tolerance in Cucumber
Ist Teil von
  • Plant physiology (Bethesda), 2009-06, Vol.150 (2), p.801-814
Ort / Verlag
Rockville, MD: American Society of Plant Biologists
Erscheinungsjahr
2009
Link zum Volltext
Quelle
Electronic Journals Library - Freely accessible e-journals
Beschreibungen/Notizen
  • Brassinosteroids (BRs) induce plant tolerance to a wide spectrum of stresses. To study how BR induces stress tolerance, we manipulated the BR levels in cucumber (Cucumis sativus) through a chemical genetics approach and found that BR levels were positively correlated with the tolerance to photo-oxidative and cold stresses and resistance to Cucumber mosaic virus. We also showed that BR treatment enhanced NADPH oxidase activity and elevated H₂O₂ levels in apoplast. H₂O₂ levels were elevated as early as 3 h and returned to basal levels 3 d after BR treatment. BR-induced H₂O₂ accumulation was accompanied by increased tolerance to oxidative stress. Inhibition of NADPH oxidase and chemical scavenging of H₂O₂ reduced BR-induced oxidative and cold tolerance and defense gene expression. BR treatment induced expression of both regulatory genes, such as RBOH, MAPK1, and MAPK3, and genes involved in defense and antioxidant responses. These results strongly suggest that elevated H₂O₂ levels resulting from enhanced NADPH oxidase activity are involved in the BR-induced stress tolerance.
Sprache
Englisch
Identifikatoren
ISSN: 0032-0889, 1532-2548
eISSN: 1532-2548
DOI: 10.1104/pp.109.138230
Titel-ID: cdi_gale_incontextgauss_ISR_A202486283
Format
–
Schlagworte
Adaptation, Physiological - drug effects, Antioxidants, Antioxidants - metabolism, Biological and medical sciences, Brassinosteroids, Cholestanols - pharmacology, Cold Temperature, Cucumbers, Cucumis sativus - drug effects, Cucumis sativus - genetics, Cucumis sativus - physiology, Cucumis sativus - virology, Cucumovirus - drug effects, Cucumovirus - physiology, Environmental Stress and Adaptation to Stress, Fundamental and applied biological sciences. Psychology, Gene Expression Regulation, Plant - drug effects, Genes, Genetic aspects, Hardiness, Health aspects, Hydrogen Peroxide - metabolism, Kinetics, Leaves, Models, Biological, Molecular Sequence Data, Oxidases, Oxidative stress, Paraquat - pharmacology, Physiological aspects, Plant genetics, Plant physiology and development, Plants, Reactive oxygen species, Reactive Oxygen Species - metabolism, RNA, Messenger - genetics, RNA, Messenger - metabolism, Seedlings, Steroids, Heterocyclic - pharmacology, Stress tolerance, Stress, Physiological - drug effects, Time Factors

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