تاثیر تنش خشکی در اواخر فصل زراعی بر عملکرد و اجزاء عملکرد گندم‏

To study the yield stability under late season drought stress, an experiment was conducted in 2010-11 growing season in Research Farm of the College of Agriculture, University of Tehran (Karaj). In this experiment, 36 wheat genotypes in Iran with different agronomic, physiological, morphological, phenological and genetic characteristics which were introduced from 1930 to 2006, were studied under irrigated and drought stress conditions. Experimental design was simple lattice with three replications. Drought stress was started from heading stage on Azadi cultivar (common wheat cultivar grown in the studied region) until the end of growing season. At maturity, grain yield, 1000 kernel weight, number of kernels per spike were measured. The results showed that late season drought stress reduced grain yield and 1000 kernel weight but the number of kernels per spike did not change.