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Extensive chromatography of Streptomyces scabies infected potato tissue yielded five phytotoxins (two major and three minor) which on aseptically cultured minitubers individually reproduced symptoms atypical of the common scab disease. Spectroscopic examination of the three minor components elicited sufficient information to class them as close analogs of the two major components which we have previously characterized as Thaxtomin A and Thaxtomin B. In an effort to further understanding of the structural requirements for phytotoxicity in this class of compounds, variants such as 5-nitroindoyl (6-nitroindoyl), 7-nitroindoyl and phenylalanine replaced by leucine analogs were prepared. Bioactive studies involving these compounds indicated that …
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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 …
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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 …
