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Objective  To gain insights into the virulence suppressive mechanism of a nonpathogenic strain of  Rhizobium vitis  ARK-1, we co-inoculated ARK-1 with a tumorigenic (Ti) strain of  R. vitis  to examine the expression of two essential virulence genes ( virA  and  virG ) and one non-essential gene ( virD3 ) of the Ti strain at the wound site of grapevine.    Results  Co-inoculation of ARK-1 with a Ti strain VAT03-9 at a 1:1 cell ratio into grapevine shoots resulted in significantly lower expression of the virulence genes  virA, virD3,  and  virG  of VAT03-9 at 1 day after inoculation compared with those when shoots were inoculated only with VAT03-9. ARK-1 was not able to catabolize acetosyringone, which is the plant-derived metabolites inducing the entire  vir  regulon in Ti strains, suggesting the direct effect of ARK-1 on the induction of broad range of  vir  genes of  R. vitis  Ti strains.    Electronic supplementary material  The online version of this article (10.1186/s13104-018-4038-6) contains supplementary material, which is available to authorized users.

bmc research notes

Biological control agent Rhizobium (=Agrobacterium) vitis strain ARK-1 suppresses expression of the essential and non-essential vir genes of tumorigenic R. vitis