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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 (p≤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//…/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//…/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.
