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¹ Çukurova Üniversitesi Ziraat Fakültesi Tarla Bitkileri Bölümü, Adana
² Dicle Üniversitesi Ziraat Fakültesi Tarla Bitkileri Bölümü, Diyarbakır DOI : 10.21566/tarbitderg.279065 - This experiments were conducted in Çukurova (ADN) and Diyarbakır (DYB) locations during 2009- 2010 growing season. Bread wheat cultivars were grown conventional sowing time (CS) and late sowing time (LS) with rainfed (RF) and irrigated (IR) conditions (CSRF, CSIR, LSRF, LSIR). The aim of this study was to evaluate germination and seedling traits of 16 spring wheat genotypes and its relationships between grain yield. Germination was conducted under controlled condition with two stages. In the first stage, potential coleoptile length were determined on 7th day of germination in the dark and constant temperature (20°C) condition. The second germination stage were conducted with two temperature regime, control (20°C) and high temperature (30°C) with water regime, control (Ψs=0.0 Mpa) and drought stress (Ψs=- 0.6 Mpa) condition under 12 hours light/dark periods and 7 day duration. In this study, relationships between Heat Stress Index (HSIADN-IR) and Potential Coleoptile Length (PCL) was strongly releated (r=-0.551*). Negative correlations between germination ratio and Drougth Stress Index (DSI_ADN-CS) were observed under both control (r=-0.520*) and dry conditions (r=-0.568*). Germination ratio was positively correlated with DSI_DYB-LS(r=0.523*) HSI_DYB-IR (r=564*) and seedling length was positively correlated with DSI_DYBCS( r=0.611*) and HSI_DYB-IR(r=0.618*). Root dry weight was significantly correlated with DSIADN-CS (r=0.516*) and DSI_ADN-LS (r=-0.509*) in Adana and HSI_DYB-RF(r=-0.525*) and HSI_DYB-IR (r=-0.515*) in Diyarbakır conditions. Keywords : Wheat, temperature, drought, germination, yield