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1 Hokkaido Central Agricultural Experiment Station, Iwamizawa, Hokkaido 069-03, Japan
2 National Institute of Agro-Environmental Sciences, Tsukuba, Ibaraki 305, Japan
3 Hokkaido Prefectural Tokachi Agricultural Experiment Station, Memuro, Kasai-gun, Hokkaido 082, Japan
* Corresponding author. Mailing address: Hokkaido Central Agricultural Experiment Station, 217, Kamihoromui, Iwamizawa, Hokkaido 069-03, Japan. Phone: 0126-26-1518. Fax: 0126-26-4004.
ABSTRACT
The complete 16S rRNA sequences of 12 strains of Streptomyces spp., including potato scab pathogens, were determined. Among the strains of Streptomyces scabies that were isolated from diverse geographical areas and differed in melanoid pigment production, either no difference or one difference in sequence was observed. The sequence of S. scabies was most similar to the sequences of Streptomyces diastatochromogenes, Streptomyces bottropensis, and Streptomyces neyagawaensis, which belong to the Diastatochromogenes group. The levels of similarity of the 16S rRNA sequences of Streptomyces acidiscabies and S. scabies were almost the same as the levels of similarity between S. acidiscabies and other Streptomyces strains. Streptomyces sp. strain 91-Sy-13, which was isolated in Japan from potato scab and belongs to a distinct species on the basis of phenotypic characteristics and DNA relatedness, exhibited lower levels of 16S rRNA sequence similarity with other potato scab pathogens, as well as other Streptomyces species. The phylogenetic tree constructed on the basis of 16S rRNA sequence data showed that the Streptomyces spp. that cause potato scab composed unique branches. The results of our phylogenetic analysis based on complete 16S rRNA sequences confirmed the lack of close relationships among Streptomyces spp. that cause potato scab. Our findings suggest that potato scab is caused by phylogenetically diverse Streptomyces species and that the pathogenicities of these organisms developed independently.
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