بررسی استرس خشکی بر جوانه زنی و رشد گیاهچه چهار گیاه دانه روغنی و گیاه زراعی جو

Drought stress is one of the most important environmental factors that effect growth, development and production of plants. In order to investigate the effects of drought strees (different levels PEG in 0, -3, -6, -9 ,-12 ) on germination and seedling growth of Black cumin, Niger, Safflower (two lines) and Barley seeds a factorial experiment in completely randomized design with 3 replications was carried. In this study, germination and seedling growth traits including seed germination percent (physiological and ISTA definition), germination rate, average days to complete germination, germination index, vigor index, root and shoot length, root and shoot dry weight were measured. Data analysis showed that the effect of PEG on all of the measured traits were significant. Also comparison of PEG concentration treatments showed, by increasing salt concentration, all traits were significantly reduced. finally, the results showed that Safflowers, Niger, Barley and Black cumin are more resistant to drought stress, respectively. Comparison of characteristics of five plants showed that differences could be due to genetic differences between plants.