Exogenous Applications of Salicylic Acid for Inducing Systemic Acquired Resistance Against Tomato Stem Canker Disease

Research Article
Exogenous Applications of Salicylic Acid for Inducing Systemic Acquired Resistance Against Tomato Stem Canker Disease

M. Esmailzadeh, M.J. Soleimani and H. Rouhani

Journal of Biological Sciences, 2008, 8(6), 1039-1044.


Tomato stem canker caused by Alternaria alternata f. sp. lycopersici, is one of the most devastating diseases worldwide. In this study, possible effect of using Salicylic Acid (SA) in host resistance induction against tomato stem canker was investigated. Foliar applications of salicylic acid with two concentrations of 200 and 400 μM were tested against fungal pathogen. The results demonstrated that use of 200 μM dosage of SA was insufficient for inducing disease resistance. However, applications of SA in concentration 400 μM significantly reduced disease index as compared with infected control. There were significant effects of plant cell reactions in terms of percentage of penetration events that occurred at the site of attempted penetration. SA pre-treated plants were identified with higher numbers of single cell necrosis (hypersensitive response), but lower blighted areas and discolorations, as compared with non treated plant (control). The results obtained from high performance thin layer chromatography (HPTLC) analysis indicated that there is highly correlation between increasing of the endogenous levels of free SA in treated plants and reduction of the blighted leaf areas. SA pre-treatment plants caused an increase in the endogenous free SA levels in tomato leaves which resulted in systemic resistance induction.

ASCI-ID: 38-1690

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