Abstract

FARFAN, LINA M.; BENITEZ, SOLANGE V.  and  HOYOS-CARVAJAL, LILLIANA M.. Purple passion fruit bacteria sensitivity to antibiotics and copper products. rev.colomb.cienc.hortic. [online]. 2014, vol.8, n.1, pp.20-33. ISSN 2011-2173.

The purple passion fruit (Passiflora edulis Sims.) is an important export fruit in Colombia. It is attacked by bacteria, including Xanthomonas axonopodis, and control alternatives based on copper products and antibiotics have not been effective, assuming acquisition of resistance to these products by these microorganisms. From 111 bacterial isolates associated with bacterial blight in purple passion fruit (Passiflora edulis Sims) and passion fruit (Passiflora edulis var. flavicarpa Deg.) from nine regions of Colombia, an In vitro test was applied to evaluate the sensitivity of strains to ampicillin, chloramphenicol, kasugamycin, oxytetracycline, streptomycin sulphate, kanamycin sulphate and validamycin, and two copper bactericides: oxichloride and copper sulphate. The results showed that the highest rates of sensitivity to antibiotics were obtained with chloramphenicol (50 mg L^-1) and streptomycin sulphate (25 mg L^-1), with 83% and 79% of susceptible isolates, respectively. Throughout the study the population was sensitive to copper sulphate at a concentration of 750 mg L^-1; and conversely, copper oxychloride (100 % of the population) exhibited resistance. Overall, about 47.9 % of the isolates were resistant to the tested products, which would correspond to the use of alternative controls of phytobacterial disease in this crop.

Keywords : Passiflora edulis Sims; antimicrobial; resistance.

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