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- W2185134611 abstract "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 H 2 O 2 levels in apoplast. H 2 O 2 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." @default.
- W2185134611 created "2016-06-24" @default.
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- W2185134611 date "2009-01-01" @default.
- W2185134611 modified "2023-09-22" @default.
- W2185134611 title "Reactive Oxygen Species Are Involved in Brassinosteroid-Induced Stress Tolerance" @default.
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