[Biological properties of the wild rhizosphere strain Pseudomonas fluorescens 2137 and its derivatives marked with the gusA gene].

The natural wild rhizosphere strain P. fluorescens 2137 was marked with the beta-glucuronidase gene gusA. The introduction of this gene influenced the viability of the wild strain, as well as its certain physiological parameters, such as cultural characteristics, biochemical properties, and antagonistic activity against the phytopathogenic fungi Fusarium culmorum, F. oxysporum, F. graminearum, and Verticillum nigrescens. The gusA-marked derivative strains that deviate the least from the wild strain in biological properties can be used to monitor populations of P. fluorescens 2137 cells in the plant rhizosphere.