ارزیابی ژنوتیپ‌های گندم دوروم براساس شاخص‌های مقاومت به خشکی

Drought stress as the most common environmental stress has important affect in the reduction of agricultural production in the arid and semi-arid regions of the world. In this study 14 durum breeding lines along with three check genotypes (one new released durum wheat variety (Saji) and two durum (Zardak) and bread wheat (Sardari) landraces were evaluated based on drought resistance indices under rainfed and supplemental irrigation conditions in Dryland Agricultural Research Sub-Institute (Sararood station), Kermanshah, Iran, during 2012-13 cropping season. In regard to significant correlations the drought resistance indices of MP, GMP, STI, HM, YSI and YI with grain yield under rainfed condition and significant correlations the indices of SSI and TOL with grain yield under supplemental irrigation, these indices can be used to identify drought tolerant genotypes. Biplot analysis based on principal component analysis classified the genotypes as tolerant, resistant and susceptible groups. Based on this, genotypes 1 (cv. Saji), 3 (Sardari), and 12 were considered as tolerant genotypes. Genotypes No. 9, 14, and 17 with high values of SSI and TOL were identified as susceptible genotypes. In contrast, the genotypes No. 2 (Zardak), 4 and 7 with high yield under rainfed condition and low yield productivity under supplemental irrigation condition had the highest values of YSI and characterized as drought resistant genotypes. Kew words: durum wheat, drought resistance indices, biplot