Effectiveness of tailocins produced by Pseudomonas fluorescens SF4c in controlling the bacterial-spot disease in tomatoes caused by Xanthomonas vesicatoria

PRÍNCIPE, ANALÍA; FERNANDEZ, MARICRUZ; TORASSO, MILENKA; GODINO, AGUSTINA; FISCHER, SONIA

MICROBIOLOGICAL RESEARCH

ELSEVIER GMBH

Año: 2018 vol. 212-213 p. 94 - 94

0944-5013

he development of alternatives for the use of chemical pesticides for plant disease control is the present-day andongoing challenge for achieving sustainable agriculture. Pseudomonas fluorescens SF4c, native strain from wheat,produces tailocins (phage-tail-like bacteriocins) with antimicrobial activity against several phytopathogenicstrains. We thus investigated the efficacy of foliar application of these bacteriocins to control the bacterial-spotdisease in tomato caused by Xanthomonas vesicatoria Xcv Bv5-4a. The disease severity and incidence index werereduced by 44 and 36%, respectively; while the number of viable cells of X. vesicatoria Xcv Bv5-4a decreasedafter bacteriocin treatment. Furthermore, bacteriocin was effective in reducing bacterial-spot-disease symptomson tomato fruits even when applied 12 h after infection. Tailocin activity was not affected by abiotic influencessuch as adjuvant, light and temperature and, biotic factors such as apoplastic-fluids. In contrast, no anti