Present paper deals with the results of the experiment on the adsorption of Xanthomonas oryzae phages : OP_1, OP_1h and OP_2 on their nine host bacteria containing the phage susceptible, non-susceptible and resistant bacteria, and of the plaque forming efficiencies of phages on their susceptible host bacteria under optimum conditions. It was found that the adsorption rates of three phages are higher on the phage-susceptible bacteria, and lower or none on the non-susceptible and resistant bacteria. The adsorption of OP_1 phage on the non-susceptible bacterium K7 showed, however, high value as on the susceptible bacteria, while slight adsorption rate of OP_1h and OP_2 phages was shown on their resistant bacterium I-8-2.
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