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. 1995 Apr;107(4):1241–1247. doi: 10.1104/pp.107.4.1241

Plasma Membrane Redox Enzyme Is Involved in the Synthesis of O2- and H2O2 by Phytophthora Elicitor-Stimulated Rose Cells.

C K Auh 1, T M Murphy 1
PMCID: PMC157258  PMID: 12228430

Abstract

An elicitor prepared from the autoclaved cell walls of Phytophthora sp. induced O2- generation and H2O2 accumulation by cultured cells of Rosa damascena Mill. cv Gloire de Guilan. N,N-Diethyldithiocarbamate, a superoxide dismutase inhibitior, blocked H2O2 accumulation and caused a dramatic accumulation of O2- by elicitor-treated rose cells. In the absence of N,N-diethyldithiocarbamate no detectable O2- was accumulated. Diphenyleneiodonium, quinacrine, pyridine, and imidazole, inhibitors of the mammalian neutrophil NADPH oxidase responsible for the generation of O2- during phagocytosis, inhibited O2- generation by elicitor-treated rose cells. Diphenyleneiodonium also inhibited NADH-dependent O2- production by plasma membranes isolated from rose cells. None of the four compounds inhibited the peroxidase activity in the cell-suspension medium. These results demonstrate that elicitor-stimulated accumulation of H2O2 comes only from superoxide dismutase-catalyzed dismutation of O2-. The data are inconsistent with the hypothesis that the synthesis of O2- is catalyzed by extracellular peroxidase and suggest that the enzyme responsible for the synthesis of O2- by elicitor-treated rose cells might be similar to the mammalian neutrophil NADPH oxidase.

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Selected References

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