جستجوی مقالات مرتبط با کلیدواژه « آنغوزه » در نشریات گروه « باغبانی »

Bitter asafetida (Ferula asa-fetidae L.) is a wild plant of the family Umbelliferae. The present study was carried out to determine the type of dormancy of the plant’s seed, and find out the most suitable treatment needed for quick germination of seeds. Twelve treatments including GA3 (500, 1000, 1500 ppm), KNO3 (0.1, 0.2 0.3 Molar), rinsing (24, 48, 72 Hour),elimination of seed coat (one year-old seeds, newly harvsted seeds) along with coated newly harvested seeds vs. control (coated one year old seeds) were employed. The above treatments were carried out in the framework of two completely randomized designs at two temperatures of 20 and 5˚C and in four replications. The results obtained through an application of ANOVA indicated the newly harvested seeds not germinating under any of the treatment conditions, a proof of their embryo not being fully developed. Within all the treatments, except the one in which the coating was removed, the seeds needed at least 20 days to be kept at 5˚C to germinate. Other treatments (different levels of GA3, KNO3 as well as rinsings) significantly affected the final germination (percent), but did not conspicuously increase the speed of germination. Elimination of the coating in one year-old seeds led to their germination of 84% within 4 days even at 20˚C, whereas the other seeds did not germinate at this temprature. The results finally indicated an elimination of seed coat as the most suitable treatment for asafetida seed germination. Increase in the elevation of the seed collection site caused a significant increase in the chilling need of the seed prior to its germination.

Ferula assa-foetida L. is an Iranian endemic medicinal plant that belongs to Apiaceae family. Seeds of this plant have a long period of dormancy. Therefore, experimental methods, which decrease seed dormancy period, could be effective in the seed germination rate and also in revival of the plant. The effect of GA3 as a pre-treatment (at high concentrations in a short time period at 23±2°C) and treatment (low concentrations in a long time period at 23±2 and 4°C)on germination of two Tabas and Shirkooh population seeds on MS medium was analyzed. Comparative analyses on treated and pre- treated seeds from two populations with GA3 at 23±2°C temperature did not show any significant changes in both the germination percentage and rate. However, seeds chilling treatment (4°C) indicated increased germination rate and percentage. So, after 12 weeks the maximum germination percentages were 84 and 56% for Tabas and Shirkooh populations. Also the effect of the temperature was investigated on seed germination on the wet filter paper in two levels of 23±2 and 4°C. According to results, maximum seed germination percentage obtained for Shirkooh were (90%) and Tabas (67%) populations by soaking the seeds on the wet filter papers in Petri dishes within 8 to 9 weeks. Finally, it seems that increasing endogenous GA3 concentration, which is provided mostly by chilling treatment, is the most effective factor for breaking the seed dormancy.