|Rowhani, Adib - UNIV OF CALIF, DAVIS|
Submitted to: Proceedings of the International Council for the Study of Viruses and Virus
Publication Type: Abstract Only
Publication Acceptance Date: September 12, 2003
Publication Date: September 20, 2003
Citation: Uyemoto, J.K., Rowhani, A. 2003. Discovery of different grapevine sources with graft-transmissible agents causing union-incompatibility on sensitive rootstocks. Proceedings of the International Council for the Study of Viruses and Virus. Technical Abstract: Depending on fruit color, symptoms of scion/rootstock imcompatibility consisted of an entired canopy of yellow-(on white varieties) or red-(red varieties) mottled leaves, leaf margins sometimes rolled downward, weak to moderate shoot growth, and an overgrowth of the scion at the rootstock junction. Weakened plants may persist awhile, but usually decline rapidly and die in two years. Based on differential responses via bud-chip inoculations onto a panel of 18 different grape rootstocks, up to five graft-transmissible agents (GTAs) were differentiated. One GTA originally found in Redglobe was characterized and named Grapevine rootstock stem lesion associated virus(GRSLaV). When RT-PCR assays were performed on samples of struggling grape plants from several wine grape regions in California, an average of one in five samples tested positive for GRSLaV.