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Induced Thermo-dormancy in Rapeseed (Brassica napus L.) Cultivars by Sub- and Supra-optimal Temperatures

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Abstract

Till now the impacts of sub- and supra-optimal temperatures on the induction of secondary dormancy (SD) in rapeseed seeds have not yet been investigated. Therefore, the possibility of SD induction at sub- and supra-optimal temperatures (thermo-dormancy) was investigated in six rapeseed cultivars with high (Trapper and Agamax), medium (Hayola-50 and Hayola-420) and low (Rohan and Zarfam) SD potential. Seeds were incubated at 5, 10, 15, 20, 25, 30, 35, 37 and 40 °C under both light (12 h light/12 h dark) and continuous dark conditions to assess for thermo-dormancy induction. Thermo-dormancy in high SD potential cultivars was more than 90% at 5, 37 and 40 °C in the dark. The cultivars with medium SD potential only displayed high level of thermo-dormancy (> 70%) at 37 and 40 °C, but at 5 °C it was less than 25% in the dark. In high and medium SD cultivars, light stimulated germination and reduced thermo-dormant seeds at sub- and supra-optimal temperatures. In the low SD cultivars, which displayed very low percentages of thermo-dormancy and thermo-inhibition of germination at sub- and supra-optimal temperatures, seed mortality increased with rise of temperature. Accordingly, the reduced germination of rapeseed at sub- and supra-optimal temperatures may be due to thermo-inhibition, thermo-dormancy and seed mortality, which are also affected by light condition. Use of seeds with low potential for SD induction from tolerant cultivars in environments prone to temperature stress and/or adopting suitable planting date to increase crop establishment under stressful environments are recommended.

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This research did not receive any specific Grant from funding agencies in the public, commercial.

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MG, FG, HRS and EZ designed the experiments. MG and FG carried out the experiments. Statistical analysis was done by MG and FG. The manuscript was written by MG, FGF, and HRS. All authors read and approved the final manuscript.

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Correspondence to Farshid Ghaderi-Far.

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The authors declare that there is no conflict of interest.

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Handling Editor: Heather Nonhebel.

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Gorzin, M., Ghaderi-Far, F., Sadeghipour, H.R. et al. Induced Thermo-dormancy in Rapeseed (Brassica napus L.) Cultivars by Sub- and Supra-optimal Temperatures. J Plant Growth Regul 40, 2164–2177 (2021). https://doi.org/10.1007/s00344-020-10266-2

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  • DOI: https://doi.org/10.1007/s00344-020-10266-2

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