Resumo

SERNA-COCK, Liliana; CAMARGO-GUARNIZO, Andrés Felipe  e  RENGIFO-GUERRERO, Carlos Andrés. Antimicrobial activity and fermentation kinetics of Weissella confusa against Xanthomonas albilineans. Acta Agron. [online]. 2013, vol.62, n.2, pp.97-104. ISSN 0120-2812.

The antimicrobial activity of Weissella confusa against Xanthomonas albilineans, microorganism that produces leaf scald in sugar cane, was evaluated. The fermentation kinetics of lactic acid bacteria in commercial substrate (MRS) and agricultural waste sugar cane harvest (RAC) was measured. Submerged fermentations were performed at 32 ° C for 4 hours, pH 6 and agitation of 100 rpm, and every hour the biomass production, substrate consumption and antimicrobial activity was measured. Weissella confusa showed antimicrobial activity against phytopathogenic bacteria X .albilineans in MRS and RAC as carbon sources, the inhibition halos diameters were 18.94 and 16.77 mm, respectively. Weissella confusa although not being isolated from sugar cane, showed excellent growth on the RAC substrate compared with the commercial substrate MRS. Therefore, it can be suggested W. confusa as a potential for biocontrol of leaf scald sugar cane, however, should be evaluated the mechanism of action and their biological and economic impacts. The RAC substrate becomes an economical alternative for the production of lactic acid biomass.

Palavras-chave : Acid lactic bacteria; agricultural wastes; sugar cane.

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