بررسي تأثير تنش خشكي بر عملكرد و اجزاء عملكرد ژنوتيپ هاي مختلف آفتابگردان آجيلي

Effect of drought stress on yield and yield components of nutty sunflower genotypes

Drought is one of the most important environmental stresses that inhibit agricultural production. So, introducing new drought tolerant genotypes that grow well in these environments is important for researchers. In order to study the effect of drought stress on yield and yield components of nutty sunflower genotypes an experiment conducted in experimental farm of Islamic Azad University - Karaj Branch. Experimental design was split plot under randomized complete design with four replications. The main factor was irrigation and the sub plots were five nutty sunflowers (Pestehi, Ghalami, Yazidi, Doursefid, Shamshiri) genotypes. Leaf dry weight, petiole dry weight, stem dry weight, head dry weight, total dry weight, plant height, head diameter, seeds 1000 weight, kernel to coat rate, seed yield, harvest index and susceptibility index to drought were measured. Results showed significant differences between irrigation treatments for measured traits. According to our results, susceptibility index to drought can be used as an appropriate selection criteria for selecting drought tolerant nutty sunflower genotypes. Keyword: Nutty sunflowers, seed yield, yield components, drought stress.