عنوان مقاله [English]
One of the techniques which is used for improving and increasing seed germination and emergence under normal and stress conditions is seed priming. Effect of salicylic acid (SA) priming on morphological and vigor of seedlings was studied in a safflower variety named Goldasht. The experiment was executed in the field. Eight levels of seed treatments included: control (untreated seed), 0 (hydroprimed seed), primed seeds with 400, 800, 1200, 1600, 2000 and 2400 μM SA were considered. The results showed that seed priming by SA was more effective than hydropriming and consequently rised up seed vigor and seedlings performance. Seed priming by SA lead to an increase in germination percentage, emergence index, seedling total dry weight, root length, leaf number and leaf area index; and a decrease to averge germination period. High root density (60%) was obtained for 2400 μM SA as compared to the control and hydropriming treatments. Leaf number was added from 6.7 in the control to 10.17 in 2400 μM treatment, average leaf area of individual leaf increased at least 30% in high level of SA. The results disclosed that seed priming by SA increased both plant leaf area and leaf area index as a consequence of higher leaf number and individual leaf area. Having added levels of SA applications was accompyning with accelerating in root length and dryweight. In addition to root length, SA also enhanced root density. The highest root density in seedlings were found at high level of SA concentration. However, hydropriming had no significant effects on meaured traits and lowest amounts of most characteristics was belonging to the control and hydroprimed seeds.
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