A Strobilurin Fungicide Enhances the Resistance of Tobacco against Tobacco Mosaic Virus and Pseudomonas syringae pvtabaci
- 1 September 2002
- journal article
- Published by Oxford University Press (OUP) in Plant Physiology
- Vol. 130 (1), 120-127
- https://doi.org/10.1104/pp.004432
Abstract
The strobilurin class of fungicides comprises a variety of synthetic plant-protecting compounds with broad-spectrum antifungal activity. In the present study, we demonstrate that a strobilurin fungicide, F 500 (Pyraclostrobin), enhances the resistance of tobacco (Nicotiana tabacum cv Xanthi nc) against infection by either tobacco mosaic virus (TMV) or the wildfire pathogenPseudomonas syringae pv tabaci. F 500 was also active at enhancing TMV resistance in NahGtransgenic tobacco plants unable to accumulate significant amounts of the endogenous inducer of enhanced disease resistance, salicylic acid (SA). This finding suggests that F 500 enhances TMV resistance in tobacco either by acting downstream of SA in the SA signaling mechanism or by functioning independently of SA. The latter assumption is the more likely because in infiltrated leaves, F 500 did not cause the accumulation of SA-inducible pathogenesis-related (PR)-1 proteins that often are used as conventional molecular markers for SA-induced disease resistance. However, accumulation of PR-1 proteins and the associated activation of the PR-1 genes were elicited upon TMV infection of tobacco leaves and both these responses were induced more rapidly in F 500-pretreated plants than in the water-pretreated controls. Taken together, our results suggest that F 500, in addition to exerting direct antifungal activity, may also protect plants by priming them for potentiated activation of subsequently pathogen-induced cellular defense responses.Keywords
This publication has 30 references indexed in Scilit:
- Priming in plant–pathogen interactionsTrends in Plant Science, 2002
- Salicylic Acid and Disease Resistance in PlantsCritical Reviews in Plant Sciences, 1999
- Dead cells do tell talesCurrent Opinion in Plant Biology, 1998
- Impaired Fungicide Activity in Plants Blocked in Disease Resistance Signal TransductionPlant Cell, 1998
- SYSTEMIC RESISTANCE INDUCED BY RHIZOSPHERE BACTERIAAnnual Review of Phytopathology, 1998
- Systemin Potentiates the Oxidative Burst in Cultured Tomato Cells1Plant Physiology, 1998
- Salicylic Acid Interferes with Tobacco Mosaic Virus Replication via a Novel Salicylhydroxamic Acid-Sensitive MechanismPlant Cell, 1997
- Production of Salicylic Acid Precursors Is a Major Function of Phenylalanine Ammonia-Lyase in the Resistance of Arabidopsis to Peronospora parasiticaPlant Cell, 1996
- Systemic acquired resistance signal transductionCritical Reviews in Plant Sciences, 1996
- Dichloroisonicotinic and salicylic acid, inducers of systemic acquired resistance, enhance fungal elicitor responses in parsley cellsThe Plant Journal, 1992