1887

Abstract

Three plant-pathogenic isolates of 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 species. Strain S63 has yellow-white, smooth, cylindrical spores that are borne in monoverticillus flexuous spore-chains. Strain S77 has purple-red, spiny spores that are borne in simple rectus flexuous spore-chains. Strain S78 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 and S78 belong to the genus and have low homology to other species (less than 71·2 and 75·7 %, respectively). The 16S–23S ITS region of strain S77 was not amplified by these primer sets. DNA–DNA hybridization results for all three isolates show distant relationships to previously described species; therefore, on the basis of polyphasic evidence, the names sp. nov. for strain S63 (=LMG 21390=KACC 20252), sp. nov. for strain S77 (=LMG 21391=KACC 20253) and sp. nov. for strain S78 (=LMG 21392=KACC 20254) are proposed.

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2003-11-01
2019-12-15
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