Detection of new genetic profiles and allelic variants in improperly classified grapevine accessions.

ABSTRACT

Thirty-seven grapevine accessions, collected in Central Italy, were characterized by morphological and genetic analysis, according to guidelines developed by European Union programs of grapevine research and standardization. Traditional denominations of some sampled varieties were revealed to be incorrect; moreover, 10 synonymies and 12 homonymies were recognized. Ampelographic and ampelometric measurements of leaf characters were performed. These data generated a phenotypic similarity matrix and a relative diagram showing morphological differences between specimens. Many samples presented different morphology even in the presence of the same genotype, probably as a result of various environmental pressures. Grapevines were typed by 12 microsatellite loci and then compared with the CRA-VIT genetic resource database. Twenty-five SSR profiles were clearly identified as well-known cultivars, while nine genotypes did not find a direct correspondence these samples could represent putative new autochthonous Latial Vitis vinifera cultivars or hybrid varieties. The genetic approach also detected three new (169 and 173 in VVMD27 locus; 179 in ISV2 locus) and seven rare allelic variants. Plant sample classification by oral history, morphological observations, and molecular results were compared and discussed. Scions of samples were planted in the Botanic Garden of the University of Rome "Tor Vergata", to preserve grapevine biodiversity and to protect possible new autochthonous varieties.