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Kim, Young-Sook,Cho, Jun-Mo,Park, Duck-Hwan,Lee, Heung-Goo,Kim, Jeom-Soon,Seo, Sang-Tae,Shin, Kwan-Yong,Hur, Jang-Hyun,Lim, Chun-Keun The Korean Society of Plant Pathology 1999 Plant Pathology Journal Vol.15 No.3
Crude extracts of pathogenic Streptomyces turgidiscabies isolates produced necrotic reaction on potato slices. Necrosis was first visible 24 hr after application and increased in severity over several days. However, necrosis was not observed when crude extracts of nonpathogenic strains were applied onto tuber slices. Presence of thaxtomin A from crude extracts of pathogenic S. turgidiscabies was identified by thin layer chromatography and high performance liquid chromatography. Nonpathgenic strains did not produce thaxtomin A in oatmeal broth. Inoculation of potato tuber slices with thaxtomin A partially purified from crude extract of a pathogenic S. turgidiscabies ST5 reproduce necrotic reaction suggesting that thaxtomin A is a pathogenicity determinant in S. turgidiscabies.