Among the varieties traditionally used in the grape juice industry, the 'Concord' cultivar has distinguished itself by the good aroma and flavor that it provides to the juice. This study aimed to evaluate the production and quality of six 'Concord' clones of grapevine fruits ('22', '28', '49', '202', '211'and '225') on three rootstocks ('IAC 766', 'IAC 572' and '420-A'). The experiment was carried out in Rolândia, Paraná State, Brazil, in a 6x3 factorial scheme (clones x rootstocks), in a completely randomized design, with five replications and split-plots, in two growing seasons (2009/2010 and 2010/2011). Plants were trained in a trellis system spaced at 4.0 m x 2.0 m. The '22' clone on 'IAC 766' presented higher means for production, yield and number of bunches per plant, as well as lower titratable acidity (TA). The '211' clone on 'IAC 572' presented lower TA and higher means for number of bunches per plant, soluble solids (SS) and SS/TA ratio. The '420-A' rootstock provided a higher SS and SS/TA ratio to the 'Concord' clones.
Vitis labrusca L.; grape juice; clonal selection
