Volume 17, Issue 3 (10-2026)
2026, 17(3): 33-54 |
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1- Crop and Horticultural Science Research Department, Ardabil Agricultural and Natural Resources Research and Education Center, (AREEO), Ardabil, Iran , saber.seifamiri@gmail.com
2- Department of Agronomy and Plant Breeding, College of Agriculture, University of Mohaghegh Ardabili (UMA), Ardabil, Iran
2- Department of Agronomy and Plant Breeding, College of Agriculture, University of Mohaghegh Ardabili (UMA), Ardabil, Iran
Abstract: (755 Views)
Background and Objective: Drought stress is the most important limiting factor for rapeseed yield in dryland areas, and selecting tolerant genotypes based on physiological indices is an effective solution to mitigate yield losses. This study aimed to evaluate qualitative and biochemical indices as biomarkers of tolerance and identify drought-tolerant rapeseed genotypes.
Methods: The experiment was conducted as a split plot in a randomized complete blocks design with three replications and in two crop years. The main factor included three irrigation regimes (full irrigation, irrigation interruption at flowering stage and irrigation interruption at pod stage) and the subfactor included 11 rapeseed genotypes. The measured traits included oil yield, fatty acids profile and seed glucosinolate content.
Results: Drought stress, especially at the flowering stage, significantly reduced oil yield. Among the 11 genotypes studied, Jerome (under post‑pod setting stress) and Saffar (under post‑flowering stress) genotypes were identified as drought-tolerant genotypes due to their greater stability in maintaining oil yield and limited changes in fatty acids profiles. In contrast, Zafar genotype showed the most sensitive biochemical response with a 148.7% increase in erucic acid and a 32.6% decrease in palmitic acid. The Julius and RGS003 genotypes, despite being more sensitive to drought stress, also produced the highest oil yield under full irrigation conditions.
Conclusion: Drought tolerance in rapeseed does not necessarily equate to high yield potential. The Jerome and Saffar genotypes, with their metabolic stability mechanism, are recommended for cultivation in areas prone to late-season drought stress, while the Julius and RGS003 genotypes are good choices for fully irrigated conditions. Therefore, selecting the right genotype for water-deficit areas requires simultaneous consideration of ''physiological tolerance'' and ''yield potential.''
Methods: The experiment was conducted as a split plot in a randomized complete blocks design with three replications and in two crop years. The main factor included three irrigation regimes (full irrigation, irrigation interruption at flowering stage and irrigation interruption at pod stage) and the subfactor included 11 rapeseed genotypes. The measured traits included oil yield, fatty acids profile and seed glucosinolate content.
Results: Drought stress, especially at the flowering stage, significantly reduced oil yield. Among the 11 genotypes studied, Jerome (under post‑pod setting stress) and Saffar (under post‑flowering stress) genotypes were identified as drought-tolerant genotypes due to their greater stability in maintaining oil yield and limited changes in fatty acids profiles. In contrast, Zafar genotype showed the most sensitive biochemical response with a 148.7% increase in erucic acid and a 32.6% decrease in palmitic acid. The Julius and RGS003 genotypes, despite being more sensitive to drought stress, also produced the highest oil yield under full irrigation conditions.
Conclusion: Drought tolerance in rapeseed does not necessarily equate to high yield potential. The Jerome and Saffar genotypes, with their metabolic stability mechanism, are recommended for cultivation in areas prone to late-season drought stress, while the Julius and RGS003 genotypes are good choices for fully irrigated conditions. Therefore, selecting the right genotype for water-deficit areas requires simultaneous consideration of ''physiological tolerance'' and ''yield potential.''
Type of Article: Research |
Subject:
Plant growth under stressful conditions
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Journal of Soil and Plant Interactions by http://jspi.iut.ac.ir is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
This work is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License which allows users to read, copy, distribute and make derivative works for non-commercial purposes from the material, as long as the author of the original work is cited properly.
This work is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License which allows users to read, copy, distribute and make derivative works for non-commercial purposes from the material, as long as the author of the original work is cited properly.
