Journal Article

Exopolysaccharides Produced by Plant Pathogenic Bacteria Affect Ascorbate Metabolism in <i>Nicotiana tabacum</i>

Maria C. de Pinto, Paola Lavermicocca, Antonio Evidente, Maria M. Corsaro, Silvia Lazzaroni and Laura De Gara

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 44, issue 8, pages 803-810
Published in print August 2003 | ISSN: 0032-0781
Published online August 2003 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcg105
Exopolysaccharides Produced by Plant Pathogenic Bacteria Affect Ascorbate Metabolism in Nicotiana tabacum

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  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry

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The role of the exopolysaccharides (EPSs) produced by plant pathogenic bacteria has not completely clarified, they are considered either molecules able to avoid or delay the activation of plant defences, or acting as signal in the plant–pathogen cross-talk. In order to understand whether EPSs are recognized by infected plant cells and are able to induce the activation of plant defence responses, their capability to induce metabolic alteration in tobacco cells has been analysed. The results indicate that several EPSs, even if not chemically related, induce increases in phenylalanine ammonia-lyase, a marker enzyme of defence responses of plants against stress; but others are completely ineffective. The EPSs affecting phenylalanine ammonia-lyase also induce an increase in hydrogen peroxide production. Moreover, they alter the metabolism of ascorbate, another parameter indicative of the presence of stress conditions and the involvement of which in the hypersensitive reaction has been recently reported. The possibility that specific EPSs could act as signals in the plant–pathogenic bacteria interaction is discussed.

Keywords: Keywords: Ascorbate — Biotic stress — Exopolysaccharides — Phenylalanine ammonia-lyase — Plant pathogenic bacteria — Redox enzymes.; Abbreviations: AFR, ascorbate free radical; AFRR, ascorbic free radical reductase; APX, ascorbate peroxidase; ASC, ascorbate; DHA, dehyroascorbic acid; DHAR, dehydroascorbate reductase; EPS, exopolysaccharide; HR, hypersensitive reaction; PAL, phenylalanine ammonia-lyase; PCD, programmed cell death; ROS, reactive oxygen species; TBY-2, Bright Yellow 2 line.

Journal Article.  5764 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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