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Streptomyces luridiscabiei sp. nov., Streptomyces puniciscabiei sp. nov. and Streptomyces niveiscabiei sp. nov., which cause potato common scab disease in Korea

¹ Division of Biological Environment, College of Agriculture and Life Sciences, Kangwon National University, Chuncheon 200-701, Korea
² Alpine Agricultural Experiment Station, Pyeongchang 232-950, Korea
³ Division of Molecular Genetics, National Institute of Agricultural Science and Technology, Suwon 441-707, Korea
⁴ Department of Agricultural Sciences, Life Sciences Building, Hobart Campus, School of Agricultural Science, University of Tasmania, Hobart TAS 7001, Australia
⁵ Central Research Institute, Kyung Nong Corporation, 226, Guhwang-dong, Gyungju 780-110, Korea

Correspondence
Chun Keun Lim
chunkeun{at}kangwon.ac.kr

Three plant-pathogenic isolates of Streptomyces spp., isolated from potatoes with common scab disease lesions in Korea, are described as novel species. Morphological and physiological properties of these isolates were distinct from those of previously described Streptomyces species. Strain S63^T has yellow-white, smooth, cylindrical spores that are borne in monoverticillus flexuous spore-chains. Strain S77^T has purple-red, spiny spores that are borne in simple rectus flexuous spore-chains. Strain S78^T has white, smooth, cylindrical spores that are borne in simple rectus flexuous spore-chains. These three isolates differed from known pathogenic strains by analysis of 16S rRNA gene sequences in a previous study. Furthermore, genetic uniqueness of our isolates was confirmed by sequencing of the 16S–23S internal transcribed spacer (ITS) region, which indicated that isolates S63^T and S78^T belong to the genus Streptomyces and have low homology to other Streptomyces species (less than 71·2 and 75·7 %, respectively). The 16S–23S ITS region of strain S77^T was not amplified by these primer sets. DNA–DNA hybridization results for all three isolates show distant relationships to previously described Streptomyces species; therefore, on the basis of polyphasic evidence, the names Streptomyces luridiscabiei sp. nov. for strain S63^T (=LMG 21390^T=KACC 20252^T), Streptomyces puniciscabiei sp. nov. for strain S77^T (=LMG 21391^T=KACC 20253^T) and Streptomyces niveiscabiei sp. nov. for strain S78^T (=LMG 21392^T=KACC 20254^T) are proposed.

The GenBank/EMBL/DDBJ accession numbers for the 16S–23S ITS sequences determined in this study are given in Table 1.

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