Determination of Breeding Performance on Halfeti Rose (R. odorata Louis XIV) In Crossbreeding

One of the factors influencing rose crossbreeding success is parental selection. The success rate of a breeder is influenced by factors such as ploidy level, pollen quality, seed number per fruit, and seed germination rate, which indicate parental productivity. This study was conducted to determine the productivity of Halfeti Rose (Rosa odorata Louis XIV) as a seed parent and its compatibility with the commercial rose varieties in terms of combination. Six commercial-cut roses (Inferno, Moonlight, Tineke, Black Baccara, Lady Rose, Speelwark) were used as pollen parents. Fruit set rate, seed number per fruit, seed and fruit weight, seed germination rate, and pollen germination rate were recorded. Among the commercial-cut roses, the pollen germination rate ranged from 7.82% to 23.55%. The highest pollen germination rate was observed in the Tineke and Black Baccara varieties, respectively. The fruit set rate of combinations where Halfeti Rose was used as the seed parent was determined as 63.75%, the number of seeds per fruit was 5.05, and the seed germination rate was 31.21%. Based on PCA and Heatmap analysis, Halfeti x Speelwark, Halfeti x Black Baccara, and Halfeti, x Lady Rose were found to be the most successful combinations. Halfeti Rose exhibited values close to the overall average in terms of fruit set rate and seed germination rate among rose breeding studies. The parameters mentioned in studies on rose breeding show that the Halfeti rose has the potential to be used as a seed parent.