چکیده:
Dormancy breaking and germination requirements were investigated in seeds of Ferula ovina and Ferula gummosa. Seeds of rather species were collected from north and eastern-north rangelands of Iran. Seeds of each of the species were subjected to different treatments including various levels of GA3, chilling and combination of GA3 and chilling (GA-chilling). In contrast to treated seeds, non-treated seeds did not germinate. Germination of both species increased at higher concentration of GA3. In the case of Ferula ovina the highest germination percentage was obtained when the seeds were treated with 1000 ppm GA-chilling with 76% of germination. For Ferula gummosa seeds, the highest germination percentage was found when exposed to 1500 ppm GA-chilling with 53% germination. Both species well responded to different periods of cold stratification (30/60 days), especially F. ovina with 36% and 55% germination, respectively. The results suggest that F. gummosa has deeper dormancy. For both species, germination rate was positively correlated with germination percentage.
خلاصه ماشینی:
"Sc. Student, Faculty of Natural Resources, University of Tehran, 31585-3314, Karaj, Iran b Associate Professor, Faculty of Natural Resources, University of Tehran, 31585-3314, Karaj, Iran c Assistant Professor, Faculty of Natural Resources, University of Tehran, 31585-3314, Karaj, Iran d Assistant Professor, Faculty of Agriculture, University of Bu-Ali Sina, Hamedan, Iran Received 1 June 2007; Received in revised form 22 December 2007; Accepted 26 April 2008 Abstract Dormancy breaking and germination requirements were investigated in seeds of Ferula ovina and Ferula gummosa.
Abscisic acid (ABA) and gibberellins (GAs) are the hormones proposed to control primary dormancy (the form of dormancy that is acquired during seed development), ABA by inhibiting and GAs by inducing germination (Hilhorst and Karssen, 1992; Iglesias and Babiano, 1997).
The objectives of this study were to determine the effect of exogenously applied GA and moist chilling on seed germination and to devise an effective method for breaking seed dormancy of both Ferula ovina and F.
According to Salisbury & Ross (1992), gibberellic acid is the growth regulator that truly acts on seed germination, exerting a favorable effect on the break of dormancy.
These results show that although GA3 and cold stratification significantly increase germination, these treatments were not as effective as the treatment GA3 accompanied by chilling.
The effect of soaking, temperature and duration of pre-chilling on seed dormancy breaking of Ferule ovina.
Effect of temperature, light and gibberellic acid on the germination of seeds of 43 species native to Western Australia."