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Abstract

Several species of Solanum produce secondary metabolites with antimicrobial activity. In

the present study, the inhibitory activity of Solanum chrysotrichum, S. erianthum, S. torvum

and S. rostratum against phytopathogenic Curvularia lunata was determined. Methanol extracts

from roots, stems, leaves and fruits were evaluated by the method of mycelial inhibition

on agar and the minimum inhibitory concentration (MIC) was determined on a liquid

medium. To increase the antimicrobial activity, the combined activity of the most active

extracts for each phytopathogen was also determined (a combination of intra and interspecies

extracts). The results showed that 12 of the 16 methanolic extracts of Solanum species

had antifungal effects against C. lunata. The extracts of S. rostratum and S. erianthum

developed the highest activity (~80% inhibition and 28.4 MIC μg . ml–1), even, equal to or

greater than, the reference fungicide. The mixture of the active extracts of S. chrysotrichum

and S. torvum increased their activity. Various extracts affected the macro and microscopic

morphology and most of them reduced the number of conidia of the fungus. This resulted

in the capacity to control the vegetative growth and reproduction of C. lunata, the causal

fungus of corn leaf spot disease.

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Authors and Affiliations

Zuleima Guadalupe Hernández-Rodríguez
Christian Anabi Riley-Saldaña
Alma Rosa González-Esquinca
Marisol Castro-Moreno
Iván de-la-Cruz-Chacón

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