Exopolysaccharides produced by plant pathogenic bacteria affect ascorbate metabolism in Nicotiana tabacum

被引:32
作者
de Pinto, MC
Lavermicocca, P
Evidente, A
Corsaro, MM
Lazzaroni, S
De Gara, L
机构
[1] Univ Bari, Dipartimento Biol & Patol Vegetale, I-70125 Bari, Italy
[2] CNR, Ist Sci Prod Alimentari, I-70125 Bari, Italy
[3] Univ Naples Federico II, Dipartimento Sci Suolo Pianta & Ambiente, I-80055 Portici, Italy
[4] Univ Naples Federico II, Dipartimento Chim Organ & Biochim, I-80126 Naples, Italy
[5] Interdisciplinary Ctr Biomed Res, CIR, I-00155 Rome, Italy
关键词
ascorbate; biotic stress; exopolysaccharides; phenylalanine ammonia-lyase; plant pathogenic bacteria; redox enzymes;
D O I
10.1093/pcp/pcg105
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
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.
引用
收藏
页码:803 / 810
页数:8
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