Comparative biochemistry of the oxidative burst produced by rose and french bean cells reveals two distinct mechanisms

Plant Physiology
G P BolwellT M Murphy

Abstract

Cultured cells of rose (Rosa damascena) treated with an elicitor derived from Phytophthora spp. and suspension-cultured cells of French bean (Phaseolus vulgaris) treated with an elicitor derived from the cell walls of Colletotrichum lindemuthianum both produced H2O2. It has been hypothesized that in rose cells H2O2 is produced by a plasma membrane NAD(P)H oxidase (superoxide synthase), whereas in bean cells H2O2 is derived directly from cell wall peroxidases following extracellular alkalinization and the appearance of a reductant. In the rose/Phytophthora spp. system treated with N, N-diethyldithiocarbamate, superoxide was detected by a N, N'-dimethyl-9,9'-biacridium dinitrate-dependent chemiluminescence; in contrast, in the bean/C. lindemuthianum system, no superoxide was detected, with or without N,N-diethyldithiocarbamate. When rose cells were washed free of medium (containing cell wall peroxidase) and then treated with Phytophthora spp. elicitor, they accumulated a higher maximum concentration of H2O2 than when treated without the washing procedure. In contrast, a washing treatment reduced the H2O2 accumulated by French bean cells treated with C. lindemuthianum elicitor. Rose cells produced reductant capable of stimulating ...Continue Reading

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Citations

Dec 30, 2003·BioFactors·K LochnerM Böttger
Dec 6, 2001·Protoplasma·P P BolwellP Wojtaszek
Jan 7, 2010·Protoplasma·María Florencia IannoneMaría Patricia Benavides
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