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GENETIC GAINS IN WHEAT IN TURKEY: WINTER WHEAT FOR DRYLAND CONDITIONS

Mesut Keser^1,*, Nurberdy Gummadov², Beyhan Akin², Savas Belen³, Zafer Mert⁴, Seyfi Taner⁵, Ali Topal⁶, Selami Yazar⁴, Alexey Morgounov², Ram Chandra Sharma⁷, Fatih Ozdemir⁵

¹ International Center for Agricultural Research in the Dry Areas (ICARDA), Yenimahalle, Ankara 06170, Turkey

² International Maize and Wheat Improvement Center (CIMMYT), Yenimahalle, Ankara 06170, Turkey

³ Transitional Zone Agricultural Research Institute, Tepebasi, Eskisehir 26005, Turkey

⁴ Central Research Institute for Field Crops, Ankara 06170, Turkey

⁵ Bahri Dagdas International Agricultural Research Institute, Konya 42050, Turkey

⁶ Department of Field Crops, Faculty of Agriculture, Selcuk University, Konya 42030, Turkey

⁷ International Center for Agricultural Research in the Dry Areas (ICARDA), Tashkent, Uzbekistan

Wheat breeders in Turkey have been developing new varieties since the 1920s, but few studies have evaluated the rates of genetic improvement. This study determined wheat genetic gains by evaluating 22 winter/facultative varieties released for rainfed conditions between 1931 and 2006. The study was conducted at three locations in Turkey during 2008–2012, with a total of 21 test sites. The experimental design was a randomized complete block with four replicates in 2008 and 2009 and three replicates in 2010–2012. Regression analysis was conducted to determine genetic progress over time. Mean yield across all 21 locations was 3.34 t ha⁻¹, but varied from 1.11 t ha⁻¹ to 6.02 t ha⁻¹ and was highly affected by moisture stress. Annual genetic gain was 0.50% compared to Ak-702, or 0.30% compared to the first modern landmark varieties. The genetic gains in drought-affected sites were 0.75% compared to Ak-702 and 0.66%compared to the landmark varieties. Modern varieties had both improved yield potential and tolerance to moisture stress. Rht genes and rye translocations were largely absent in the varieties studied. The number of spikes per unit area decreased by 10% over the study period, but grains spike⁻¹ and 1000-kernel weight increased by 10%. There were no significant increases in harvest index, grain size, or spike fertility, and no significant decrease in quality over time. Future use of Rht genes and rye translocations in breeding programs may increase yield under rainfed conditions.

Thematic Areas:Triticeae genome structure and functional genomics

Format of the abstract for 2nd IWC:/Uploads/editor/20220424/626519dcb4dee.docx