摘要：In this study yield and yield component, Harvest Index (HI), Stress Tolerance Index (STI), Stress Susceptibility Index (SSI), Tolerance Index (Tol), Mean Productivity (MP) and Geometric Mean Productivity (GMP) of 13 advanced winter and intermediate cold hardy wheat genotypes with two advanced genotypes of Shahreeyar and C-79-16 as checks were investigated under normal irrigation and after anthesis drought stress condition in a randomized complete block design experiment with three replications in Ardabil, Iran in 2006-2007. The effect of drought stress on harvest index was significant (pâ¤0.01). The lowest harvest index (38.14%) was observed in genotype KRC66/SERI//KINACI97 and the highest harvest index (45.66%) was observed in genotype FDL4/KAUZ. Genotypes KARL//â¦/3/F1502W9.01, Appolo/Mhdv and SG-U7067 produced more grain yield under normal irrigation condition compared to checks and mean stress susceptibility indices of genotypes SG-U7067, 885K4.1//MNG/SDV1/3/1D13.1/MLT and GKRABA were lower than checks. On the other hand, under the drought stress condition genotypes SG-U7067, GKRABA and 885K4.1//â¦/1D13.1/MLT yielded higher than checks and their mean stress susceptibility indices were lower than checks. Genotype SG-U7067 produced the highest yield under both normal irrigation and drought stress conditions. The yield reduction of this genotype was lowest under the drought stress conditions. Genotypes SG-U7067 with mean grain yield of 5.020 t ha-1 under drought stress , lowest SSI of 0.82 and highest STI of 0.62 was selected as the best drought stress tolerant genotype among the 15 genotypes that were evaluated.
