VIEW ARTICLE

Resistance

Crown Gall Resistance of Vitis spp. and Grapevine Rootstocks. S. Süle, Plant Protection Institute of the Hungarian Academy of Sciences, Budapest 1525, P.O. Box 102; J. Mozsar(2), and T. J. Burr(3). (2)Plant Protection Institute of the Hungarian Academy of Sciences, Budapest 1525, P.O. Box 102; (3)Department of Plant Pathology, New York State Agricultural Experiment Station, Cornell University, Geneva 14456. Phytopathology 84:607-611. Accepted for publication 23 February 1994. Copyright 1994 The American Phytopathological Society. DOI: 10.1094/Phyto-84-607.

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.