Tomato partial resistance to Rhizoctonia solani involves antioxidative defense mechanisms

The resistance interactions of four tomato cultivars to five Rhizoctonia solani isolates, causing foot rot, were investigated. Priming H2O2 accumulation, peroxidase and ascorbate peroxidase activity was observed in CH Falat, as a partially resistant cultivar. Maximum peroxidase activity in CH Falat...

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Bibliographic Details
Published in:Physiological and molecular plant pathology 2013-01, Vol.81, p.74-83
Main Authors: Nikraftar, Fariba, Taheri, Parissa, Falahati Rastegar, Mahrokh, Tarighi, Saeed
Format: Article
Language:English
Subjects:
Ascorbate peroxidase
Basal resistance
Biological and medical sciences
Fundamental and applied biological sciences. Psychology
Fungal plant pathogens
Peroxidase
Phenolics
Phytopathology. Animal pests. Plant and forest protection
Reactive oxygen species
Solanum lycopersicum
Thanatephorus cucumeris
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Summary:The resistance interactions of four tomato cultivars to five Rhizoctonia solani isolates, causing foot rot, were investigated. Priming H2O2 accumulation, peroxidase and ascorbate peroxidase activity was observed in CH Falat, as a partially resistant cultivar. Maximum peroxidase activity in CH Falat was observed at 24 h post inoculation (hpi) which was earlier than maximum phenolics accumulation at 72 hpi. In addition, application of peroxidase inhibitor reduced phenolics level. Therefore, peroxidase might be involved in phenolics production, as an effective resistance mechanism in our pathosystem. ► Infection process of Rhizoctonia solani AG 3 on tomato leaf discs. ► Correlation between infection cushion formation and severe disease progress. ► H2O2-related mechanisms involved in tomato basal resistance to R. solani. ► Importance of early H2O2 accumulation in tomato defense to R. solani. ► Involvement of peroxidase dependent phenolics production in basal resistance.
ISSN:0885-5765
1096-1178
DOI:10.1016/j.pmpp.2012.11.004