اثر تنش خشكي بر عملكرد و اجزاي عملكرد 5 رقم گلرنگ بهاره در منطقه ي تبريز

The Effect of Drought Stress on Yield and Yield Components of 5 Spring Safflower (Carthamus tinctorius L.) Varieties in Tabriz, Iran

To study the effects of drought stress on yield and yield components of 5 spring safflower varieties a factorial experiment based on randomized complete block design with 3 replications was conducted during growing season of 2006 at the Agricultural and Natural Resources Research Center of East Azarbajjan, Iran. Treatments in this study consisted of two levels of drought stress and 5 safflower varieties. Analysis of variance and mean comparisons showed that drought stress decreased seed yield. The highest yield reduction was observed in PI (564.2 Kg) and lowest reduction (63 Kg) in local variety of Esfahan. It can, thus, be said that Esfahan variety is more drought tolerant than PI genotype. As the result of this study it was also revealed that head diameter, seed number per head and 1000 kernel weight decreased, while, head number per plant did not differ between these two levels of drought stresses. It can finally be concluded that the variety native to Arak produced the highest seed yield and its components as compared with other varieties.