Effect of seed priming and cold treatment to improve seed germination characteristics and vigor of three population of Sahandi medicinal herb of savory (Satureja sahendica

Document Type : Original Article

Abstract

In order to evaluate the priming effects of gibberllic acid and potassium nitrate on germination and seedling growth characteristics of three populations Satureja sahendica،, an experiment was conducted. The treatments including plant populations (Majarition, Zeninjab and Osko), gibberllic acid (500, 250 ppm) and potasium nitrate (1%, 2%) and cold treatment in three replications arranged in factorial was carried out in greenhouse and laboratory conditions in Natural  Gene Bank  Group of  Research Institute of Rangeland and Forestry in 2011- 2012. After seedling growth, traits including: percentage and speed of germination, root and shoot length ,  ratio of root length by shoot length, vigor index, normal seedlings, seedling length, fresh and dry weight and ratio of dry weight to fresh weight were measured in laboratory condition. Also in greenhouse, traits including: percentage and speed of emergence, root and shoot length ,  ratio of root length by shoot length, normal seedlings, seedling length, fresh and dry weight and ratio of dry weight to fresh weight were measured. Analysis of variance showed that there were significanc differences between populations,  treatments and interaction of populations with treatments( 5% ) for all traits  in both experimental conditions except  for seed emergence percentage and shoot length in greenhouse condition. Comparing seed germination characteristics of three population showed that population of Mjarishen  selected from East Azarbijan had higher vigor characteristics like seed germination (97%), speed of germination (15 sprout/day) and vigor index(41) than other populations in laboratory condition. In greenhouse condition, percentage and speed of emergence of Osko population as 17%  and  1 sprout/day, respectively, were higher than other two populations.  Effect of  treatment on the populations showed  that priming of the seeds with gibberllic acid were more effective for vigor traits like(germination speed, emergence speed and vigor index)  than the other treatments in both experimental conditions.

Keywords

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