Safar Mohammadi-joo, Asadullah Mirasi, Rohullah Saeidi-aboeshaghi, Mahmoud Amiri
Departement of Horticulture, Faculty of Agriculture, Khorasgan Azad University, Iran
Department of farm Machinery, Faculty of Biosystems Engineering, Islamic Azad University, Shahrecord Branch, Lordegan center, Shahrecord, Iran
Department of Agronomy, Faculty of agriculture, University of Yasuj, Iran
Key words: Biplot, Drought stress, Grain yield, Wheat, Tolerance indices.
Among the different abiotic stresses, drought is the limitation that induces a highly negative effect on crop production. In order to classify drought tolerant genotypes in bread wheat, an experiment was conducted in a split plot experimental on the basis of randomized complete block design with three replications under two irrigation and water deficit stress conditions during 2013-2014 cropping season in Isfahan Province of Iran. Five drought resistance indices including Tolerance Index (TOL), Stress Susceptibility index (SSI), Stress Tolerance Index (STI), Geometric Mean Productivity (GMP) and Mean Productivity (MP) were calculated for each genotype based on both grain yields under non-stress and stress conditions. Result of correlation analysis between grain yields and calculated drought resistance indices revealed that MP, GMP and STI were the best indices for identifying high yielding genotypes in non-stress and stress conditions. Gabriel Biplot Multivariate chart revealed that ‘Ouhedi’ genotype relatively identified as drought tolerant. Therefore it is recommended to be used as parents for improvement of drought tolerance in other cultivars.