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Applied and Environmental Microbiology, May 1999, p. 1930-1935, Vol. 65, No. 5
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Selective Isolation and Distribution of Sporichthya Strains in Soil

Shin-ichi Suzuki,* Toru Okuda, and Saburo Komatsubara

Screening Research Laboratory, Discovery Research Laboratories, Tanabe Seiyaku Co., Ltd., 2-2-50 Kawagishi, Toda-shi, Saitama 335-8505, Japan

Received 16 November 1998/Accepted 17 February 1999

A simplified enrichment method in which centrifugation is used for selective isolation of Sporichthya strains from soil is described. Gellan gum plus 2 mM CaCl2 stimulated growth of Sporichthya polymorpha KCC A0089 so that this organism was readily recognized on an isolation plate. High yields of motile spores were obtained by using a flooding solution containing 0.1% skim milk in 10 mM MOPS (morpholinepropanesulfonic acid) (pH 8.0) and then incubating the preparation at 27°C for 60 min and centrifuging it at 1,000 × g for 10 min. Dry heat treatment at 80°C for 60 min increased the ratio of Sporichthya colonies to nonfilamentous bacteria on a gellan gum plate. Since S. polymorpha was sensitive to 14 antibiotics, including nalidixic acid, addition of these antibiotics was not suitable for isolating Sporichthya strains. Our isolates were identified as Sporichthya strains on the basis of their morphological and chemotaxonomic characteristics. By combining the techniques described above, we isolated a number of Sporichthya strains from 21 soil samples, which were collected in Belgium, France, India, Japan, Papua New Guinea, Spain, Taiwan, the United Kingdom, and the United States. Sporichthya strains are widely distributed in the world. To our knowledge, this is the first time that Sporichthya strains have been isolated from locations other than the United States or Japan.

* Corresponding author. Mailing address: Screening Research Laboratory, Discovery Research Laboratories, Tanabe Seiyaku Co., Ltd., 2-2-50 Kawagishi, Toda-shi, Saitama 335-8505, Japan. Phone: 81-48-433-2564. Fax: 81-48-433-2565. E-mail: s-suzuki{at}tanabe.co.jp.

Applied and Environmental Microbiology, May 1999, p. 1930-1935, Vol. 65, No. 5
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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