Abstract
Abstract Tall three-awn grass (Stipagrostis pennata T. De Winter) is a dominant grass species in central desert areas of Iran; however, its seeds have low viability when used in desert reclamation. Seeds were collected from the wild and germinated under different dormancy-breaking treatments [soaking in water and in potassium nitrate, stratification and gibberellic acid (GA) application] and salinity under controlled conditions. Seed soaking in tap water for 3 h and stratifying 10 days at 3–7°C had the highest germination percentage. Soaking in potassium nitrate and GA application had no significant effects on seed germination. Increased salinity significantly decreased germination percentage, plumule and radicle lengths and lengthened germination time. Radicle lengths decreased more than plumule with salinity. Optimum time of seed harvesting was the end of May and early June, when the seeds had the highest germination percentage and lowest moisture content.
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