Abstract
We have shown that the transfer of plasmid RP4 took place between two strains of Xanthomonas campestris pv. corylina and from Xanthomonas campestris pv. corylina to Erwinia herbicola and vice versa when the strains were inoculated in hazelnut tissues in an experimental orchard. Transfer occurred throughout all seasons and was independent of the physiological conditions of the host tissues. The main factor governing transfer in planta appeared to be the frequency of contacts among donors and recipients. The frequency of transfer was correlated with the level of bacterial populations. RP4 was stable in the inoculated strains of Xanthomonas campestris pv. corylina as well as in Erwinia herbicola in hazelnut tissue. RP4 was detected in two isolates of resident epiphytic microflora, Pseudomonas fluorescens and Erwinia herbicola.
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