بررسی خواب بذر در هفت گونه گیاه دارویی از تیره چتریان (Apiaceae)

Seeds of seven species of medicinal plants collected from the natural habitat in Lorestan province in summer 2011. Germination test carried out in a completely randomized design with four replications of 25 seeds in H2O. Species of Smyrnium cordifrolium, Kelussia odoratissima, Dorema aucheri and Ferulago angulata had no germination while Heracleum persicum, Bunium luristanicum and Falcaria vulgaris showed germination of 30, 96 and 97% respectively. Different treatments of breaking dormancy applied to the species with germination below 30% [moist-chilling for periods of 2, 4, 6, 8, 10 and 12 weeks, with two concentrations of 250 and 500 ppm of gibberellic acid, a combination treatment (gibberellic 250 ppm + 4 weeks moist-chilling and gibberellic acid 500 ppm + moist-chilling for 4 weeks) and potassium nitrate 2 g/l]. The results showed that moist-chilling was the most effective treatments to break seed dormancy of Heracleum persicum (6 weeks), Dorema aucheri (12 weeks), Kelussia odoratissima (12 weeks) and Ferulago angulata (12 weeks). Therefore, based on their reactions to the treatments, dormancy of Kelussia odoratissima and Ferulago angulata could be classified as deep physiological dormancy and species of Dorema aucheri and Heracleum persicum intermediate physiological dormancy type.