抄録
1) A newly isolated bacterium, strain S-48, having mannose isomerase was named Xanthomonas rubrilineans S-48.
2) The mannose isomerase activities of bacteria belonging to Xanthomonas were investigated. The enzyme was found to be in all the Xanthomonas species examined and was strongly produced by Xanthomonas oryzae IAM 281-1 and Xanthomonas pruni IAM 281-5. The enzyme of these bacteria was formed constitutively.