Resumen

GONZALEZ-MORALES, Susana et al. Effect of alkamides as tolerance inductors to biotic stress in tomato. Rev. Mex. Cienc. Agríc [online]. 2015, vol.6, n.spe12, pp.2371-2382. ISSN 2007-0934.

The aim of this study was to determine the histological effects and those related to vigor with the application of an extract of Heliopsis longipes on tomato seedlings inoculated with Fusarium oxysporum f. sp. lycopersici (FOL). H. longipes extract was sprayed at a concentration of 300 mgL-1 in tomato seedlings subsequently inoculated with FOL by root immersion. Twenty days later incidence and severity data were taken, finding that the application of the extract caused a decrease of 15% and 80% respectively for these variables whereas for plant height there was an increase of 14.3%. In root length and dry weight of leaves and stem there was a decrease in the results; however, these values were higher than those obtained for plants inoculated with FOL. Histological changes were found by effect of FOL infection as well as for extract application, which consisted in modifying the distribution of vascular bundles in root, as well as increasing the relative area of root and stem cortex and reducing the number of xylem vessels in root. These results indicate that the application of the extract has an effect on wilting symptoms caused by FOL.

Palabras llave : affinin; Heliopsis longipes; Fusarium oxysporum f. sp. Lycopersici and Solanum lycopersicum.