Abstract
A two-year experiment (2018–2020) was arranged as a factorial in a randomized complete block design with three replicates to study the response of camelina (Camelina sativa (L.) Crantz) to irrigation regimes at different sowing dates in Karaj, Iran. The experiment factors were four irrigation regimes including full irrigation and restricted irrigation starting either from silicle formation, or flowering and stage of maximum stem length, as well as three sowing dates including September 27 (27-Sep), October 12 (12-Oct) and 25 (25-Oct). Significant reductions were recorded in agronomic (numbers of silicle per plant and seed per silicle, and 1000-seed weight) and physiologic (RWC, relative water content) and chlorophyll content) traits when plants were subjected to drought stress. In contrast, the stomatal resistance (Rs), canopy temperature (CT), proline and carbohydrate contents increased under drought conditions compared with well-watered treatment. Delay in the sowing date led to reductions in numbers of silicle per plant and seed per silicle, 1000-seed weight, RWC, and chlorophyll content. The Rs, CT, proline and carbohydrate contents of plants sown on 12-Oct and 25-Oct had higher values than in 27-Sep. The highest oil contents were obtained from the full irrigation regime (31.02%), and 27-Sep sowing date (30.04%), and on each sowing date, the maximum seed yield belonged to the full irrigation regime. Overall, a significant reduction in water consumption can happen by delaying the sowing date to 12-Oct and restricting irrigation after silicle formation regarding the slight amount of seed yield depletion compared with the later sowing date and mild- and severe-stress irrigation regimes.
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The authors gratefully acknowledge the support provided for this survey by the Seed and Plant Improvement Institute (SPII), Karaj, Iran.
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Amir Hosein Shirani Rad: conceptualization, methodology, project administration. Mohammad Malmir: writing—original draft preparation, formal analysis, software. Hamed Eyni-Nargeseh: investigation, software, formal analysis, writing—original draft preparation.
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Abbreviations: RWC—relative water content; CT—Canopy temperature; Rs—Stomatal resistance; BBCH—BiologischeBundesanstalt, Bundessortenamt and CHemical industry; RGR—relative growth rate; NAR—net assimilation rate; SAS—statistical analysis system; MSE—mean square error; GLM—general linear model; LSD—least significant difference.
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Shirani Rad, A.H., Malmir, M. & Eyni-Nargeseh, H. Appropriate Irrigation Regime and Sowing Date Boost Camelina Seed Yield and Oil Content by Improving Physiologic and Agronomic Traits. Russ J Plant Physiol 70, 108 (2023). https://doi.org/10.1134/S1021443723600095
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DOI: https://doi.org/10.1134/S1021443723600095