Evaluation seed vigor of wheat as affected by biochemical changes during hydropriming

One of factors in successful seed hydropriming technique is seed imbibition duration. To evaluate hydroprimed seed vigor of three wheat cultivars as affected by seed imbibition durations and also evaluation biochemical changes during hydropriming, two experiments was done as factorial arrangement with completely randomized design. In first experiment, effect of 7 hydropriming durations (0 , 6 , 8 , 10 , 12 , 14 and 16 h ) was research on germination and seedling growth of Star, Chamran and Fong cultivars. In second experiment, some biochemical traits and enzyme activities was measured in primed seeds for 6 , 8 and 10 h hydropriming durations. Results of first experiment showed that hydropriming with 8 h imbibition has the most positive effect on seed vigor of wheat cultivars. Among of cultivars, Star has the higher root length and root weight. Star and Chamran cultivars have no significant difference for germination rate and the lowest of this trait was observed in fong cultivar. Results of second experiment showed that longer hydropriming duration caused greater α amylase enzyme activity and higher contents of soluble carbohydrates and proteins, also increase content of malondialdehyde and insufficient antioxidant enzyme activities in 10 h than 8 h hydropriming duration was observed. Among cultivars the highest and lowest α amylase enzyme activity and soluble carbohydrates and proteins was observed in Star and Fong cultivars respectively. In this research correlation antioxidant enzyme activities with germination and seedling growth was positive and significant.