Document Type : Research Paper
Authors
1 PHD student of Shahid Beheshti University
2 Associate Professors in the Department of Agroecology, Environmental Sciences Research Institute, Shahid Beheshti University, G.C., Tehran, Iran.
3 Professors in Oil Seed Research Department, Seed and Plant Improvement Institute, Karaj, Iran
4 Assistant Prof. Seed and Plant Improvement Institute
Abstract
Objective: Available water for irrigation of canola decreases towards the end of the season, due to reduced rainfall and the simultaneous late-season irrigation for other spring crops. Therefore, the possibility of the plant facing drought stress in the final stages of growth is very likely. So, it is very important to select drought-tolerant genotypes in arid and semi-arid regions.
Methods: Therefore, to investigate oilseed rape cultivars under Late-season drought stress, a split-plot experiment was conducted in a complete randomized blocks design with four replications for two cultivation years (2017–2019) in Karaj agricultural research station. Treatments included three drought stress (full irrigation, withholding irrigation from the pod formation stage, and flowering stage) as main plots and five oilseed rape cultivars (Sarigol, RGS003, Hayola 401, Zafar, and Dalgan) as sub-plots.
Results: The results revealed that drought stress, especially from withholding irrigation from the flowering stage led to a significant decrease in 1000-seed weight, number of silique per plant, number of seeds per silique, seed yield, oil percentage, oil yield, length of the growing duration, water use efficiency. Under full irrigation, Delgan and Zafar cultivars, and under drought stress, RGS 003 and Delgan cultivars had the highest seed yield.
Conclusion: RGS 003 and Delgan cultivars can be recommended as suitable cultivars in late season drought stress conditions in Karaj.
Keywords
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