Dendrogram of 89 accessions in the O34-16 group based on hierarchal cluster analysis (Ward method) using the simple dissimilarity matrix derived from 34 SSR markers. Accession names or ID in blue font are V. vinifera subsp. sylvestris based on collection records. Two accessions in red font were resistant to powdery mildew in the field trials; both are V. vinifera subsp. sylvestris based on flower phenotype and seed morphology.