This research was conducted at the breeding station of the Turkish breeding company Agromar A.Ş in the city of Bursa in Turkey during the 2013 and 2014 growing seasons. Used from within the same heterotic group crossings, 7 donor materials were obtained during the 2012 winter season in the greenhouse. The inducer line RWK-76xRWS, provided by University of Hohenheim, Germany, was used for generating haploid seeds. The donor and inducer crossing was performed during the 2013 summer season. The haploid selection and chromosome doubling were performed during the 2014 summer season. Seven donors were used for haploid induction which name are DNR1, DNR2, DNR3, DNR4, DNR5, DNR6, DNR7 respectively, from each donor different amount of ear crosses were performed (DNR1:16 ears, DNR2:10 ears, DNR3:10 ears, DNR4:12 ears, DNR5:11 ears, DNR6:13 ears, DNR7:11 ears). According to the present study, the average induction rate found ranged from 7.1 to 12.8%, and the average seedling survival rate in the greenhouse after colchicine application ranged from 57.9 to 77.6%. After transplanting to the field, 78.3-92.6% of these plants survived. As a result of this research, the chromosome doubling rate ranged from 22.5 to 48.3% depending on the donor material. These result indicates that maternal haploid selection visually is easy. Haploid induction rate (HIR) changes from donor to donor, its mean genotype and environment is effective for HIR. Average chromosome doubling rate is lower than other researchers' results, it is also effected by genotype and chromosome doubling methods.

This research was conducted in the southern Marmara region of Turkey during 2017-2018 growing season in order to determine general combining abilities (GCA) of parental lines, specific combining abilities (SCA) of hybrids, and estimate performance and the genetical structure of hybrid population obtained from three cytoplasmic male sterile (CMS) and four restorer lines with mid or high oleic acid content. The field experiments were designed in a Randomized Complete Block with three replications. According to the results, male parents AGR2 and AGR4 considered as good general combiners for developing increased seed and oil yields in sunflower hybrids, although there were not good general combiners in female parents for the same traits. CMS3 x AGR4 test hybrid, which has high oleic acid content, has been determined to be a promising hybrid variety candidate with its high seed and oil yields, high oil content and oleic acid content. However, although the SCA effects of CMS1 x AGR2 and CMS3 x AGR2 test hybrids were not significant for seed and oil yields, it was concluded that they were promising hybrids with high yield, oil content and mid oleic acid content. It was determined that both additive and non-additive gene effects were effective for yield and some important yield components in the hybrid population studied. The values of heterosis and heterobeltiosis values ranged from 10.8 to 728.9 % and -20.1 to 608.8 % for seed yield, respectively. Similarly, positively high and significant heterosis and heterobeltiosis values were obtained in the oil yield.