抄録
Fifteen isolates of actinophages that infect potato common scab pathogens were recovered from the soil of potato fields at Kitami, Shari, Nayoro, and Tokachi in Hokkaido prefecture. The host range, DNA restriction digestion, and virion morphology of all the isolates were used to examine their genetic diversity. They were divided into two groups on the basis of DNA restriction digestion: Isolates in Type I (12 isolates) were digested with EcoRI but not with BamHI, while those in Type II (3 isolates) were digested in the opposite way. Twelve Type I and one Type II actinophages infected both pathogenic and nonpathogenic isolates of Streptomyces spp. The other Type II actinophages only infected three pathogenic isolates. The virions of five Type I actinophages had a head and a tail, whereas all the Type II actinophages were spherical. Type I actinophages were isolated from all the soil samples, while Type II actinophages were isolated only from the Kitami and Shari samples. Two distinct groups of actinophages that infect scab pathogens were recognized in Hokkaido.
