Colloque

Correlation of phytotoxin production with pathogenicity of Streptomyces scabies isolates from scab infected potato tubers

C. Harold Lawrence

Russell R. King

Merv C. Clark

Membre a labase

C. Harold Lawrence

Résumé du colloque

A soil-borne bacterium Streptomyces scabies (Thax.) Wakeman and Henrici is considered the main causal organism of common scab of potato. Recent attempts at this institution to elucidate the host-parasite interaction have demonstrated that phytotoxins produced extracellularly by pathogenic isolates would induce the development of scab-like lesions on aseptically cultured minitubers. In an effort to ascertain the generality of the pathogen-toxin relationship, five ATCC Streptomyces strains and thirty isolates from scab lesions of field infected potato tubers collected from ten different sites in the provinces of New Brunswick, Nova Scotia, Ontario, and Alberta were screened for pathogenicity on the basis of their ability to initiate scab development on aseptically cultured minitubers and plant-generated tubers. The results were then correlated with any associated generation of the scab-inducing phytotoxin, Thaxtomin A. In all instances, a positive correlation was demonstrated between the pathogenicity of various Streptomyces scabies isolates and their ability to produce the toxin.

Contexte

Section :

Biologie des actinomycètes

Thème du colloque :

Biologie des actinomycètes

Hôte : Université de Sherbrooke

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