جۆری توێژینه‌وه‌ : Original Article

نوسه‌ران

• Halgurd Nasraden Hassan ¹
• Masood Saber Mohammed ¹
• Yadgar Ali Mahmood ²

¹ Kalar Technical Institute, Sulaimani Polytechnic University, KRG-Iraq

² University of Garmian, Kalar, As Sulaymaniayah, KRG-Iraq

پوخته‌

Under drought conditions, barley grain related traits are affected by water stress and reduced grain yield potential. Therefore, two experiments were carried out at  the Kalar technical institute for two seasons of 2016-17 and 2017-18 testing five hybrid of tow-rowed barley (Hordeum vulgare L.) under irrigated and unirrigated conditions. Genotypes were assessed for thousand grain weight, grain filling duration and grains number per particular of spike length. The average of both years , drought significantly reduced thousand grain weight by 7.63 g and shortened grain filling duration by 44.3 ^oCd, but not affected grains number may due to genetically controlling this trait. Genotypes 3//4 and 3//14 scored highest values of thousand grain weight and grain filling duration under both irrigated and drought conditions. However, genotype 3//1 was least affected by drought for both thousand grain weight and grain filling duration indicating higher resistance against water stress for this genotype. Regression analysis showed a positive relationship between thousand grain weight and grain filling duration under both irrigated (R²=0.85; P=0.03) and unirrigated (R²=0.80; P=0.04) conditions averaging over seasons showing the importance of post-anthesis period to increase the single grain weight. The correlation between thousand grain weight and grains number, however, was negative for the cross-year mean under drought conditions (R²=0.75; P=0.05) may due to the trade-off between these two traits.