بررسی ارتباط صفات جوانه زنی با تحمل به تنش خشکی درگیاه جو اسپانتانئوم

Seed dormancy is a defensive system against unfavorable environmental conditions. This research was designed to evaluate the drought stress effects on seed germination and dormancy in Hordeum spontaneum. To this end, 19 genotypes from this species and the Nosrat cultivar were evaluated under normal and drought stress condition in a green house study. Complete randomized block design with three replications were used in this study and two stress levels were imposed to the plants (95-100%FC and 25-30% FC). Based on results, drought stress had significant effects on germination index, germination percentage, seed dormancy, germination value and germination energy. Drought stress increased the seed dormancy in most of genotypes. Principle components analysis in both conditions showed that, stress tolerance index and length of coleoptiles are positively related, which indicates that genotypes with longer coleoptiles are more tolerant to drought stress conditions.