alexa Quantitative relationships among thaxtomin A production, potato scab severity, and fatty acid composition in Streptomyces.
Microbiology

Microbiology

Journal of Bacteriology & Parasitology

Author(s): Kinkel LL, Bowers JH, Shimizu K, NeenoEckwall EC, Schottel JL

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Abstract Thaxtomin A production in culture, potato common scab severity (percentage of tuber surface infected or number of lesions per tuber), and fatty acid profiles were determined for 78 Streptomyces isolates. Only pathogenic Streptomyces spp. (n = 17) produced thaxtomin A in culture. Thaxtomin A production in culture (microgram/mL) was significantly positively correlated with the percentage of tuber surface infected (R = 0.60; p = 0.017) but not with the number of lesions per tuber (R = 0.37; p = 0.17). An increase of 1 microgram/mL in thaxtomin A production corresponded to an 11\% increase in disease severity (percentage of tuber surface infected). The data indicate that quantitative information on the ability of a particular pathogen isolate or population to produce thaxtomin A may be critical to understanding and predicting the disease potential of that population. Using cluster analysis of fatty acid data, 94\% of 67 unknown field isolates grouped with other field isolates having the same pathogenicity (plus or minus).
This article was published in Can J Microbiol and referenced in Journal of Bacteriology & Parasitology

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