بررسی اثر پیش تیمار بذر به وسیله پلی اتیلن گلیکول(PEG 6000) بر کیفیت بذر ارقام گندم

This experiment was conducted in order to investigate the effects of seed priming(with PEG-6000) on germination features of wheat seeds. The research was done as a factorial experiment in the form of Completely Randomized Design with four replications at the Seed Quality Laboratory of the Research Institute of Seed and Plant Registration and Certification, Karaj, Iran. The wheat cultivar factor had four levels including Sardari, Azar 2, Falat, and Ghods. There were three levels for the factor of priming time including 12, 24, and 36 hours. The osmotic pressure for osmopriming included four levels of 0 (check), -1, -1.5, and -2 bars. Germination features were recorded in these experiments, including final germination percentage, number of normal and abnormal seedlings, number of dead seeds. The results indicated that the effects of cultivar, priming time, osmotic pressure, and two-way interactions as well as the three-way interactions were significant in 1% level in this experiment.Mean comparisons for the three-way combinations of the factors revealed that seed priming for 12 hours in the second level of osmotic pressure had improved the germination features of drylandand irrigated wheat cultivars compare to the control, significantly. The results also showed that the improvement level of seed germination features of the dryland cultivars was higher compared to those of irrigated cultivars. Although the seed germination features of the wheat cultivars declined at the upper levels of priming time and osmotic pressure.