Effects of cross pollination on fruit set and some quality and quantity fruit traits of grape cultivar qezel ouzum

A number of grapevine cultivars have female flowers and for better fruit set, they need pollinizer. Single planting of these cultivars leads to severe decrease in fruit set. This research was carried out to investigate the effect of cross pollination with four grape cultivars (Askari, Rish baba, Bidane sefid and Tabarze sefid) on fruit set, bunch weight, berry per cluster, average weight of 20 berries, TA, TSS, pH and berry color of cv. Qezel ouzum to compare self and open pollination. Experiment was based on RCBD with four replications and seven treatments. Pollen germination of maternal parent was tested in both solid and liquid media culture. Results showed that cluster and rachis weight, %fruit set, berry number and pH were significantly affected by pollen sources. The heaviest bunch and the highest %fruit set of ‘Qezel ozum’ was obtained when cross pollinated with ‘Bidane sefid’. No pollen germination was observed in both culture media and no berry set in vineyard conditions in self pollination treatment. Based on these finding, Qezel ouzum of urmia is a male sterile cultivar which requires suitable pollinizer for commercial production.