Abstract
AbstractThe elicitation of pathogenesis on potato tuber slices by 6 strains of Erwinia carotovora ssp. atroseptica was investigated by neutral red vital staining and has been compared with bacterial growth rate, penetration ability, enzyme production and enzyme spectrum. The induction of enzyme synthesis (particularly, of the extracellular polygalacturonase) elicites the rot attack on tuber tissue and this requires a sufficient bacterial density.Due to wound healing, the inductors of enzyme production are removed, and after 48 h enzymes do not attack tuber tissue any more. Therefore, growth rate and penetration ability (to get the necessary bacterial density and inductor substances) may limit virulence. A similar influence of enzyme production and enzyme spectrum of the strains on the virulence was not detected.
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