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This research was carried out to evaluate the grain yield, yield traits and some quality characteristics of 18 bread wheat genotypes in seven different locations in Thrace region using principal component analysis and genotype + genotype × environment interaction (GGE) biplot analysis to determine the genotypes with high yield and desired quality characteristics during the 2016-2017 and 2017-2018 cropping years. The experiments were arranged in a randomized complete block design with four replications. Genotype, environment and genotype × environment interactions were found statistically significant at p≤0.01 level for all investigated traits. Mean values of the genotypes varied between 4841-6807 kg ha-1 for grain yield, 118.6-131.6 days for heading date, 80.4-104.7 cm for plant height, 7.7-10.4 cm for spike length, 16.4-20.3 for number of spikelets per spike, 16.4-20.3 number of grains per spike, 1.49-2.41 g grain weight per spike, 72-77.8 kg hl-1 for test weight and 36.6-45.3 g for thousand kernel weight. Principal component biplot analyzes explained the relationships between the investigated traits and genotypes at a ratio of 60.9%. It was observed that there was a positive and significant relationship between grain yield and test weight, a negative relationship with grain yield and spike length and grain weight per spike. GGE biplot analysis explained 82.65% of the relationship of genotype + genotype x environment for grain yield. According to the GGE biplot analysis two mega environments were determined and Lucilla and Glosa genotypes took place in the biggest mega environment consisted of four environments as superior genotypes.

This study was carried out to determine grain yield and yield components of five bread wheat genotypes and 20 advanced lines at Kırklareli and Tekirdağ locations in 2017-2018 cropping year. The experiments were arranged in a randomized complete block design with four replications. In the study, grain yield (GY), plant height (PH), spike length (SL), number of spikelets/spike (SS), number of grains/spike (KS), grain weight/spike (KWS), test weight (TW) and thousand kernel weight (TKW) were investigated. Bread wheat genotypes were found statistically significant for all investigated traits according to the data obtained from two locations. According to the results of two locations the investigated traits such as GY ranked from 423.8 to 572.5 kg da-1, PH 85.3 to 116.2 cm, SL 8.8 to 12.2 cm, SS 16.5 to 21.6, KS 39.4 to 65.6, KWS 1.30 to 2.91 g, TW 65.9 to 75.6 and TKW 32.6 to 44.7 g. Relationship between GY and SS, KS and KWS were found positive and significant. In addition, relationship between PH and SL (r=0.39*), SS and KS (r=0.39*), SS and KWS (r=0.42*), TW and KS (r=0.42), TW and KWS (r=0.44*), KS and KWS (r=0.64**) were significant and positive. The highest grain yield was obtained from SME9 bread wheat advanced line at both Kırklareli and Tekirdağ, which was concluded as promising.

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