فهرست مطالب زهرا بیوک

To study the effect of temperature and moisture regimes on agronomical and physiological traits of canola cultivars, an experiment was conducted for two years (2015-17) in Iran (Karaj). In this experiment, the sowing dates were in two levels including timely cultivation (September 27) and delayed cultivation (October 27), and irrigation was in two levels including normal irrigation (control) and irrigation interruption from the podding stage as the main factors, and canola cultivars and hybrids included Kodiak, Traviata, Compass, Diffusion, Mehr2, Elvise and Tassilo were included as the subfactors. The interaction effect of sowing date × irrigation × cultivar on the seed yield, seed oil yield, biological yield, 1000 seed weight and seed number per pod were significant. In delayed sowing date and in the both normal irrigation and late season drought stress conditions, the Tassilo hybrid with a high seed yield, seed oil yield, biological yield, proline and chlorophyll content can be effective in the cultivation of canola in temperate cold regions with dry and semi-arid climates and is recommended for the delayed cultivation conditions together with late season drought stress.

To investigate the effects of drought stress and delayed planting on oil quality and fatty acids composition of canola cultivars, a factorial split-plot test was conducted in a randomized complete blocks design with three replications at Seed and Plant Improvement Institute, Karaj, Iran for two years (2015-2017) ‎. Planting date at two  levels of timely planting (Oct. 27) and late planting (Nov. 27) and irrigation at two levels of normal irrigation (control) and restricted irrigation from pod formation stage on wards were considered the main factors. Canola cultivars including Kodiak, Traviata, Compass, Diffusion, Mehr2, Elvise and Tassilo were the variables. The simple effects of planting date, irrigation, and cultivar on all research parameters were significant. The interaction effect of planting date × irrigation was significant on oil yield and oil content at the level of 5% and in terms of linoleic and palmitic acids, and stomatal resistance; it was significant at the level of 1%. The interaction effect of irrigation × cultivar was significant on palmitic acid, glucosinolate and stomatal resistance at the level of 1%. Late season drought stress and late planting dramatically reduced oil yield (58%), oil content (8%) and qualitative characteristics of canola cultivars. Among the studied cultivars, with considering all conditions of this research, the Tassilo cultivar having the seed yield (4407 kg ha-1), oil yield (2007 kg ha-1), chlorophyll content (1.43 mg g-1fw), high oleic and linoleic fatty acids, as well as low and standard erucic acid (0.41%) and glucosinolate (22.8 μmol g-1). was recommended as a favorable cultivar for planting in temperate cold regions with arid and semi-arid climates.