Activity of Chuquiraga erinacea extracts against plant pathogenic bacteria.

MENDIONDO M.E., JUáREZ B.E., ZAMPINI I.C., ISLA M.I., ORDOñEZ R.M.

Tafí del Valle. Tucumán

Jornada; XXII Jornadas Científicas. Asociación de Biología de Tucumán.; 2011

The aim of this study was to determine in ethanol extracts of aerial parts of C. erinacea, the total phenolic content and antibacterial activity against plant pathogenic bacteria. The phenolic content was determined by the method of Singleton et al. (1999). The antibacterial activity was determined qualitatively by bioautographic assays. By agar and liquid dilution tests the MIC (minimum inhibitory concentration) and MBC (minimum bactericidal concentration) were determined following the recommendations of Clinical aboratory Standard Institute. The pathogenic strains assayed were Erwinia carotovora pvar carotovora, Pseudomonas syringae pvar syringae and Xanthomonas campestris pvar vesicatori. At least two phenolic compounds had antibacterial activity against P. syringae. The order of sensitivity of the three strains with alcoholic extract was as follows: E.carotovora> P. syringae> X. campestris. The MIC values were 500-250 ìg/ml, whereas the MBC values were 200-400 mg/ ml. These results constitute the first report of the effect of extracts of aerial parts of C. erinacea against plant pathogens. This plant would be a source of antibacterial compounds that could be used as a natural tool application to control agricultural pests.