The effects of physical and chemical factors on the seed germination of Crataegus assadii

Considering studies that done most species of hawthorn have problem in seed germination. Species that examined in this study is C. assadii that is native plant of Iran. Percentage of the number of embryos was determined that 35% of fruits in this species have active embryos. 9 treatments with 3 replications were applied as follows: - insert seeds under water flow (with and without scarification)، put in 18ºC for 3 months and then cold for 4. 5 months in pot. – Insert seeds in GA3 with concentrations 150 and 300 ppm in darkness for 24 hours and then 1 month cold. – Using potassium nitrate with 0. 25%، 0. 5% and 1% concentrations. – Over wintering in farm soil (with and without scarification) till spring of the second year. All cold treatments were applied in 4ºC. Pots after treatment in lab. Were transfer to incubators. Treatment scarification and warmth 18ºC followed by cold stratification with 62% has the highest germination percentage that indicating this treatment is successful treatment among the treatments in this study..