Abstract
In this study, we have demonstrated that a mutation in the transcriptional regulator MarR gene of Erwinia amylovora is of a pleiotropic effect. E. amylovora ΔmarR bacteria are characterized by reduced virulence in relation to vegetative pear plants, decreased production of levan exopolysaccharide and decreased motility. In addition, it has been shown that mutant’s cells synthesize a greater amount of cellulose in comparison with the cells of wild-type bacteria. Thus, MarR is an important transcriptional regulator involved in the regulation of the synthesis of a large group of factors associated with Erwinia amylovora virulence.
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