Abstract

AGUILAR-GASTELUM, Ileem et al. Induction of defense response in tomato plants against Forl by garlic extract. Rev. mex. fitopatol [online]. 2018, vol.36, n.3, pp.394-413. ISSN 2007-8080.  https://doi.org/10.18781/r.mex.fit.1806-2.

A garlic extract (EA) was evaluated to induce the defense of tomato plants against Fusarium oxysporum radicis-lycopersici (Forl), by increasing the endogenous concentration of salicylic acid (AS) and jasmonic acid (AJ). Spraying 1 and 2% of EA on plants intentionally infected with 1x107 spores.mL-1 of Forl reduced in 73.53% the severity of the disease produced by Forl with respect to the infected control. The height was similar (p≤0.05) in plants treated with EA and untreated. The accumulation of AS in plants spayed with 1 and 2% of EA presented two significant increases (p≤0.05), in the second and fifth weeks after spraying, with higher concentrations than the infected and non-infected controls in 11 and 6 times for the first and 2.7 times and 3.8 times for the second, respectively. The AJ was induced from the first week after the treatments, increasing 2.5 and 1.8 times more than the infected and non-infected controls, maintaining those values throughout the evaluation. The results show that the EA reduced the development of the disease caused by Forl to tomato plants mediated by an increase in the endogenous concentration of AS and AJ.

Keywords : SAR; severity; salicylic acid; jasmonic acid.

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