NDLI: Salicylic acid-mediated hydrogen peroxide accumulation and protection against Cd toxicity in rice leaves

Content Provider	SpringerLink
Author	Chao, Yun Yang Chen, Chao Yeh Huang, Wen Dar Kao, Ching Huei
Copyright Year	2009
Abstract	The role of H$_{2}$O$_{2}$ in salicylic acid (SA)-induced protection of rice leaves against subsequent Cd toxicity was investigated. SA pretreatment resulted in an increase in the contents of endogenous SA, as judged by the expression of OsWRKY45 (a SA responsive gene), and H$_{2}$O$_{2}$ in rice leaves. Diphenyleneiodonium (DPI) and imidazole (IMD), inhibitors of NADPH oxidase, prevented SA-increased H$_{2}$O$_{2}$ production, suggesting that NADPH oxidase is a H$_{2}$O$_{2}$-generating enzyme in SA-pretreated rice leaves. DPI and IMD also inhibited SA-increased activities of superoxide dismutase (SOD), ascorbate peroixdase (APX), and glutathione reductase (GR) activities, but had no effect on SA-increased catalase (CAT) activity. Moreover, SA-induced protection against subsequent Cd toxicity could also be prevented by DPI and IMD. The inhibitory effect of DPI and IMD on SA-induced protection against subsequent Cd toxicity could be reversed by exogenous H$_{2}$O$_{2}$. All these results suggested that SA-induced protection against subsequent Cd toxicity is mediated through H$_{2}$O$_{2}$. This conclusion is supported further by the observations that exogenous H$_{2}$O$_{2}$ application resulted in an increase in SOD, APX, and GR activities, but not CAT activity and a protection against subsequent Cd toxicity of rice leaves.
Starting Page	327
Ending Page	337
Page Count	11
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	329
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Springer Netherlands
Publisher Date	2009-09-12
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Cadmium Hydrogen peroxide Oryza sativa L. Oxidative stress Salicylic acid Ecology Plant Physiology Soil Science & Conservation Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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