كليدواژه :
افزايش , فلس دوقلو , گل نرگس , Chipping , Growth regulators , Narcissus , Propagation , Twin-scaling , فاش برداري
چكيده لاتين :
Natural propagation of Narcissus is extremely slow. Twin-scaling and chipping, two methods of Narcissus propagation, can overcome this problem. Two completely different experiments in the framework of a completely randomized design were conducted to investigate the effects of some growth regulators on bulblet induction and growth in two Narcissus populations grown in Fars province. Propagules in population 1 (locally known as Shahla narcissus) were prepared through twin-scaling and soaked in solutions of 6- benzyladenin (BA), abscisic acid (ABA), kinetin (Kin), gibberellic acid (GA3), ethephon (Eth), indolebutyric acid (DBA) and 2,4-dichlorophenoxyacetic acid (2,4-D) at concentrations of 25, 50 and 100 mg I"1 for 1 h and then treated with Captan fungicide with concentration of 2 g I"1 for 30 min. Propagules in population 2 (locally known as Meskin narcissus) were prepared via chipping and dipped in ABA, BA, Eth and GA3 at concentrations of 25, 50, 100 and 200 mg I"1 for 10 min. followed by Captan treatment at 8 g I"1 for 30. Control treatment for both populations was distilled water. The propagules in both populations were mixed with moist vermiculite and incubated at 21 ± 1°C for three months. Among growth regulator treatments, the least decay percentage was observed in treatment with Eth. Higher decay percentage was obtained in population 1, with IB A and ABA treatments. In this population, the highest bulblet weight and diameter (0.38 g and 6.75 mm, respectively) was obtained in treatment with 50 mg I^-1 Kin which were significantly different compared to control. In population 1, IBA significantly decreased bulblet number. In population 2, the highest bulblet weight and diameter (0.45 g and 0.71 mm, respectively) was gained in 25 mg I^-1 GA3. ABA in all concentrations resulted in higher decay percentage. In this population, ABA at 100 and 200 mg I^-1 significantly reduced bulblet weight and diameter compared to control.
