شكست خواب و نحوه جوانه زني بذرهاي EREMURUS STENEPHYLLUS )BOISS AND BUHSE( BAKER با روش هاي فيزيكي و شيميايي

Study on Seed Dormancy and Germination of Eremurus stenophyllus by Physical and Chemical Methods.

The ripening seeds of Eremurus stenophyllus were collected from existed species from National Botanical Garden of Iran and put under physical stimulator pretreatments including soaking of seeds in water for 24-48h, cutting of seeds top, making abrasion on seed cortex, exposing to light for 24h and 12h and absolute darkness and chemical stimulators like sodium Hypochloride, Citric acid and Gibberellic acid in different concentrations for finding the suitable methods for inducing germination and breaking dormancy by these methods, the maximum percentage of seed germination and the most suitable treatment has been specified. The results showed that the most suitable pretreatment and treatment were soaking of seeds in the water for 24-48h, removing of seed cortex and washing in sodium hypocholoride 35% and distilled water, cutting of seed top and Gibberrelic acid treatment (0.005 M.) for 45 minutes under 10-15°C white light, 24h (4500-5000 lux ) for 1-3 weeks which made the germination percent 75%, germination speed 0.81, seed vigor 6.75 . Treatment with Citric acid (30mg/lit) included germination percent 100%, germination speed 0.86 and seed vigor 9. The results showed some important differences in comparison with controls.