عنوان مقاله [English]
نویسنده [English]چکیده [English]
Background and objectives: Safflower is cultivated for a long time in the past. This plant is tolerant to drought and salinity stress. Water limitationrestrictsthe crop production inmanyparts of the world, especially in arid andsemi-arid regions.The aim of this study was selection proper varietie of safflower to drought conditionsin cold regions and wasincreasing safflower tolerance to these conditions. Since the safflower is one of the oil important seeds, so this plant was selected for this study. And because so far in Ardebil, safflower widely in farms agricultural not cultivated as an useful oilseed crop has been , Decided by measuring the yield traits in rainfed conditions in area Ardabil, under consumption brassinosteroide and nonconsumption it, if appropriate and affordable performance was we it to farmers promote.
Materials and methods: In order to investigate the effect of water deficitstress on some physiological traits of safflower, an experiment carried out in Agricultural Research Station of University of MohagheghArdabili in 2014, as a split plot factorial based on randomized complete block design with three replications.The main factor was three irrigation schedules as irrigation after 80, 120 and 150 mm evaporation of the class A pan, and subplots, consisted of three safflower cultivars (Goldasht, Sina and Faraman) and two levels of Brassinosteroid (control and 10 -7 M).
Results: The results showed that drought stress reduced plant height, harvest index, biological yield, seed yield and seed yield components of safflower. In height, the highest share belonged to Sina, and because Goldasht dwarf, had the lowest plant height. In Faraman and Goldasht respectively the highest and lowest number of seeds in Capitol, and number of Capitol in plant obtained. But in thousand seed was the opposite, because between the number of seeds in the absorption of nutrients competition arisen, and result, one cultivar with highest number of seeds in capitol and capitol in plant, of lowest seed weight enjoys. In seed yield, Sina and Goldasht were in same statistical range, but Faraman of highest seed yield was enjoys. In biological yield, Faraman highest share, and Goldasht the lowest share had. But in harvest index three cultivar were in one statistical domains were. And water use efficiency, Cena was more efficient than other cultivars in mild and severe stress. Brassinosteroide consumption result, improved in height, yield cumponent, seed yield, biological yield, harvest index and WUE was.
Conclusion: Conclusion The result showed that just trait water use efficiency, interaction betwen irrigation and cultivar was significant. Thus that in control, Sina and Goldasht were in a same statistical range and had more water use efficiency than Faraman. But in mild and severe stress respectively, sina was more than Goldasht and Faraman. In other cases, the interaction effect was not significant. Therefore based on main effects, in cold regions like Ardabil Faraman cultivar between three varieties cultivated had better growth and enjoyed of highest capitol at the plant, seed at the Capitol, seed yield and biological yield. Sina cultivar had the highest plant height. And Goldasht accounted for the highest seed weight. With tensions rising, the amount yield and its components was reduced. Also Brassinosteroide consumption, result to increase water absorption and improve plant growth, and thereby improve seed yield and biological yield was.