Characterization of Bacteriocins Produced by Pseudomonas solanacearum

Abstract

Sixty six strains of Pseudomonas solanacearum from 9 different host plants were tested for bacteriocin production using the same strains as indicator. Fifty percent of them produced bacteriocins in CPG agar medium but only several producer strains released detectable bacteriocin in liquid medium. The bacteriocins produced by potato strain POPS 8409 was heat labile, resistant to trypsin and sedimentable by centrifugation and can be observed as phage-tail like particles under electron microscope. These results indicated that this bacteriocin belonged to the sedimentable and high molecular weight group.