Effect of Drought Stress and Delay Cultivation on Grain Yield, Oil Yield and Fatty Acids Composition in Canola

Document Type : Research Paper



     In order to study the effects of drought stress and delayed cultivation on grain yield, oil yield and grain fatty acid composition in canola at autumn Cultivars, a field experiment was conducted as split-plot and as Randomized Complete Block Design (CRBD) with three replications in Seed and Plant Improvement Research Institute of Karaj, Iran in 2014-2016. Experimental treatments were included sowing dates in two levels included 20th of October (normal cultivation) and 5th of November (delayed cultivation), Irrigation in 2 levels included: full irrigation (control) and drought stress (irrigation withholding in pod formation) as well as hybrids and canola autumn cultivars included Neptune, Elvise, Okapi, Tassilo, GKH0224, GKH2624 and GKH3705. Results showed that irrigation withholding in pod formation stage decreased Seed yield, oil yield, and number of grain per pod, number of pods per plant, chlorophyll content, oleic acid, and Linoleic acid content. Whereas erucic acid and palmitic acid content were increased. The highest grain yield (5354 kg.ha-1) and oil yield (2443 kg.ha-1) were in full irrigation and normal cultivation. And the lowest of them were observed in irrigation withholding in pod formation stage and delayed cultivation. The highest content of palmitic acid was observed in GKH3705 cultivar, sowing date of delayed cultivation and irrigation withholding in pod formation stage. Also the minimum amount of it was obtained in normal cultivation, Neptune cultivar under full irrigation conditions. The cultivar of GKH3705 was the most appropriate in terms of the number of seeds per pod, oil yield, saturated and unsaturated fatty acids, and chlorophyll content. According to the results, on delayed cultivation and the GKH3705 cultivar under normal irrigation and drought stress can be recommended.


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