Abstract
Vitis riparia 'Gloire de Montpellier' (Gloire) was the most resistant Vitis species and clone tested following inoculations with strains of Agrobacterium vitis and A. tumefaciens. Although tumors failed to appear after infection, the pathogen A. vitis multiplied at the same rate in Gloire as in the crown gall-susceptible V. vinifera 'Chasselas'. Root decay was induced by strains of A. vitis on all the investigated Vitis genotypes. Similarly, roots and shoots of all Vitis genotypes produced vir gene-inducing compounds. This fact ruled out the possibility that crown gall resistance is related to the lack of vir gene induction. However, T-DNA from A. vitis strain CG49 transferred to V. riparia cells at a lower rate than to V. vinifera cells, as determined by evaluation of uidA gene (GUS) expression
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