[Effect of a dormant state on the xenobiotic-degrading strain Pseudomonas fluorescens 26K].

The changes in physiological and biochemical properties of Pseudomonas fluorescens 26K, a degrader of chlorinated aromatic compounds, were revealed after the persistence in a dormant state as cyst-like cells (CLC). The CLC maintained the ability to form colonies after long-term storage possessed enhanced resistance to damaging agents (heat and drying), and specific ultrastructural organization. In populations grown from CLC on solid media, we observed the appearance ofphenotypic variants, which differed from the dominant type in the shape, consistency, and pigmentation of the colonies. The emerging phenotypes had higher growth rates on some aromatic substrates, which required the enzymes with broadened substrate specificity for their utilization.