Genome Wide Association Study of Yield and Yield-Related Traits in Elite Spring Bread Wheat Genotypes Grown under High Temperature Environment in Sudan

Genetic improvement of wheat for heat tolerance is the main breeding objective in Sudan as it principal limiting factor production. To this end, availability genetic diversity key success. diversities and genome-wide association studies were conducted to parse complex composition yield-related traits 250 bread genotypes which selected from ICARDA’s advanced materials. The evaluated under stress environment two seasons (2016/17 2017/18) sowing dates (optimum late) at Gezira Research Farm (GRF), Agricultural Corporation (ARC), Wad Medani, Sudan. Yield levels ranged 4016 - 5120 kg/ha optimum late respectively first season 5386 3926 second season. top 20 better than best check except, Imam ranked number 18 Two genotypes, 27 37, produced high grain yield both seasons. Wide ranges variations among found traits, including days heading maturity, plant height, seeds/spike, 1000 seed weight, biomass harvest index. Genome wide analyses performed using 15 kSNPmarkers phenotypic data. A total 282, 355 475 significant (P served season, across seasons, respectively. Markers (6B/Kukri_ c27662, 6B/.BobWhite_c23771_525, 6B/Excalibur_c32219_491, 6B/RAC875_c31299_13021302, 6B/BS00046264_51,6A/wsnp_Ex_rep_c69373_68312188, 6A/Tdurum contig12123_1650, 6BKukri_c27662_675 6A/BobWhite_c15802_72) on chromosomes 6B 6A highly significantly associated stable every Highly Marker-traits associations (MTAs) observed many currently identified MTAs should be further validated other elite sets so that they can used MAS program. yielding tolerant study will locations potential release Furthermore, parents program tolerance.