This work aimed to study aspects related to vegetative and productive development of plants and characteristics and chemical components of bunches of six seedless grape varieties at environmental conditions of São Francisco river's valley, Northeastern Brazil. The experiment was carried out during 1997 and 1998. The varieties tested were grafted on IAC 572 (`Jales') rootstock. The experimental model utilized was totally randomized, and with parcels subdivided into different production cycles. The results showed significative differences among varieties at different pruning times. The average weight of bunches varied from 164.8 g for `Marroo Seedless' and 203.5 g for `Beauty Seedless'. The average diameter of berries was superior to 15.7 mm for all of the varieties. The total soluble solids varied from 14.05ºBrix in `Canner' to 19.6ºBrix in `Venus'. The total titratable acidity (ATT) was lower than 0.91 g tartaric acid/100 mL of juice. The ratio SST/ATT varied from 19.05 in `Beauty Seedless' to 28.57 in `Vênus'. `Vênus' and `Marroo Seedless' were the most productive varieties, with the average annual production of 24 ton/ha and 20 ton/ha, respectively.
Vitis vinifera; grapevines; fruits; plant developmental stages; yield
