Abstract

Abstract: In this study, the effect of different levels of gibberellic acid and potassium nitrate treatment in the elimination morphological dormancy and increasing seed germination rate and percentage of primula was studied. Experiment was carried with nine treatments and three replications in a completely randomized design. Seeds were subjected to different treatments including various levels of GA3( 0, 100, or 300 ppm) for 12 h, and potassium nitrate (0, 2, and 3%) for 12 hours.The results has been showed that high concentrations of gibberellic acid medium potassium nitrate increases seed germination percentage and germination rate Primrose. According to key role of GA3 and KNO3 in release enzyms, using GA3 and KNO3can accelerate seed germination and will eliminate seed morphological dormancy of Primrose. Keywords: Primula, Gibberellic acid, Potassium nitrate, Morphological dormancy