J. ENCHEVA, G. GEORGIEV and D. VALKOVA
Dobroudja Agricultural Institute, BG – 9520 General Toshevo, Bulgaria
ENCHEVA, J., G. GEORGIEV and D. VALKOVA, 2015. Sunflower hybrid Rada, developed with mutant restorer line 12002 R. Bulg. J. Agric. Sci., 21: 961–968
Hybrid Rada was developed by simple cross of Bulgarian line cms2607 and mutant line 12002 R. Mutant line was developed after treatment of immature sunflower (Helianthus annuus L.) zygotic embryos of fertility restorer line R 2574 with gamma irradiation 137Cs at doze of 8 Gy for 1 min. Hybrid Rada was tested for three years in testing plots of Dobroudja Agricultural Institute - General Toshevo and for 2 years in 7 locations of State Variety Testing Commission. A dispersion analysis of hybrid Rada was carried out with regard to the main indices seed and oil yield at trial field of DAIGeneral Toshevo. The hybrid considerably exceeded standard commercial hybrid Albena by seed yield with 50.4 kg/dka, or 16.1% and standard commercial hybrid Super Start with 54.6 kg/dka or 17.7%. The oil yield was significantly higher with 39.3 kg/dka, or 28.3% in comparison to standard Super Start. The hybrid Rada considerably exceeded the mean standard (the Bulgarian commercial hybrid Albena, Mercury and Perfect and French commercial hybrid Diabolo PR) by seed yield with 31.8 kg/dka, or 8.2% at the 7 locations of State Variety Testing Commission. Instead higher yield hybrid Rada possessing resistance to the Orobanche cumana race F and full resistance to Plasmoparahelianthi – races 300 and 700.