RT Journal Article SR Electronic T1 Intravarietal Agronomic Variability in Croatian Native Vitis vinifera L. Cultivar Grk with Female Flower and Seedless Berries JF American Journal of Enology and Viticulture JO Am. J. Enol. Vitic. FD American Society for Enology and Viticulture SP ajev.2012.11121 DO 10.5344/ajev.2012.11121 A1 Darko Preiner A1 Jasminka Karoglan Kontić A1 Silvio Šimon A1 Zvjezdana Marković A1 Domagoj Stupić A1 Edi Maletić YR 2012 UL http://www.ajevonline.org/content/early/2012/03/09/ajev.2012.11121.abstract AB The Croatian native, Vitis vinifera L. grapevine cv. Grk, is one of only a few wine cultivars with a female flower, resulting in two types of berries in the cluster: fully developed seeded berries (~3.5g) and undersized (~0.7g) seedless berries, both ripe at harvest. This study investigated the intravarietal variability of cv. Grk and the impact of the different proportion of seedless berries on grape yield and quality of Grk clones. Significant differences in cluster proportions of seedless berries among Grk clone candidates were determined. A high positive correlation was found between the seedless berry proportion and single berry weight, must tartaric acid content and FVT. These results indicate that it is possible to select clones with a higher proportion of seedless berries in cluster, which can then be used to improve the wine quality of Grk cv.