Leaf Morphological Characteristics of F1 Genotypes in Cut Rose Breeding
2024
Sahin, Elcin Gozde | Kazaz, Soner
In the study, 10 different commercial cut rose cultivars of Rosa x hybrida L. were used as female parents, and 5 different commercial cut rose cultivars of the same species were used as male parents. A total of 1775 crosses were performed using 46 different hybrid combinations. Out of 574 F1 genotypes obtained through these crosses, 540 hybrid plants exhibited recurrent blooming. Morphological characteristics (such as leaf upper color, leaf upper color intensity, leaf brightness, basic leaf shape, leaf apex shape and leaf base shape) were studied in tip leaflets of the first or second five-leaflet leaf from the bottom on flowering branches. In F1 genotypes, it was determined that leaf upper color codes varied between 137A and 147A to 147B according to the RHS color chart. In terms of leaf upper color intensity, it was found that 2.78% of the genotypes were light green, 4.26% were medium green, 24.81% were dark green, and 68.15% were very dark green. Regarding leaf upper color brightness, it was observed that 23.52% of the F1 genotypes’ leaves had no or very weak brightness, 17.22% had weak brightness, 28.33% had medium brightness, 28.15% had strong brightness, and 2.78% had very strong brightness. In terms of primary leaf shape, 35.19% were elliptical, 52.04% were ovate, 12.59% were round, 0.18% were obovate. For leaf apex shape, 71.30% were acute, 11.11% were acuminate, 13.89% were obtuse, 3.70% were round. Additionally leaf base shape, 4.82% were acute, 31.48% were obtuse, 35.0% were round and 28.70% cordate shape. The study concluded that the obtained hybrids displayed a wide variation concerning leaf morphological characteristics compared to parental plants.
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