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Chemistry of phytotoxins associated with Streptomyces scabies the causal organism of common scab of potatoes

Russell R. King

C. Harold Lawrence

Merv C. Clark

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Russell R. King

Résumé du colloque

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 a nitro group in the 4-indoyl position and an intact diketopiperazine ring were two of the more necessary prerequisites for phytotoxicity.

Contexte

Section :

Biologie des actinomycètes

Thème du colloque :

Biologie des actinomycètes

Hôte : Université de Sherbrooke

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