Distribution of Xanthomonas citri Strain in Relation to the Sensitivity to Phages CP1 and CP2

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A large number of Xanthomonas citri isolates representing five major citrus regions (excluding quarantined canker-free export areas involved) were tested for their susceptibility to Wakimoto's phages CP1 and CP2. Throughout the regions, CP2-sensitive strains were predominantly widespread in Satsuma orange plantings while in plantings of other varieties, both CP1-sensitive and CP2-sensitive strains occur in varying ratios. Geographical pattern of the strain distribution was not distinct. Two different strains can occur in mixture on one leaf of a tree but one single lesion is usually composed of one homologous strain.Of a sum total of 1256 isolates collected in wide range surveys, only 17 (1.4 percent) were resistant to both CP1 and CP2. None out of 2514 isolates examined in intensive spot surveys was resistant to both phages. No indication was recognized for the presence in clusters of immune strains in any part of the covered regions. Intraspecific lysis spectrum of CP1 plus CP2 is comprehensive enough to include virtually all X. citri strains which occur in Japanese citrus export regions.
日本植物病理学会の論文