Abstract
Most temperature stress research in oil crops has focused on either heat or cold stress with analyses of the effects of both in combination rare. For the UK, neither the spatiotemporal hot spots of temperature stressed arable areas nor the comparative trends of heat and cold stresses for rapeseed cropping under climate change are understood. This study investigated the spatiotemporal heat and cold stresses for UK rapeseed over 1961–2020, and quantified the normalized rapeseed production loss index (fRPL) induced by heat stress during flowering. Stress indices including a literature derived heat stress index (fHS), cold degree days (CDD), with historical land cover and crop productivity data were used to comparatively study both stresses and to estimate fRPL. Results showed increasing fHS, particularly during flowering (April to May) and main yield-forming reproductive stages (spanning flowering through pod and seed development from April to July) over the study period, with fHS being negatively correlated with latitude. The decreasing values of CDD and frequency of cold stress suggest cold stress decreased during the flowering, vegetative (September to November) and reproductive stages. Notably, this study observed that annually at the UK level heat stress was increasing at a faster rate than cold stress was decreasing during flowering. The increasing values of fRPL, with significant differences between decades and regions, suggested an increasing production loss. These results presented a potentially trend of increasing heat stress impacts on future rapeseed production and further work is required to understand the specific impacts and mitigation strategies for addressing UK food security.
Data availability
All used datasets in this study are publicly available. The temperature dataset used could be accessed from https://data.ceda.ac.uk/badc/ukmo-hadobs/data/insitu/MOHC/HadOBS/HadUK-Grid/v1.2.0.ceda/1km53. Rapeseed attainable yield (Yattainable) in global grids can be accessed from GAEZ v4 portal: https://gaez.fao.org/pages/data-access-download55. The crop suitability index in classes for rapeseed for current cropland in grid cell of the period 1961-1990 was obtained from the website https://gaez-services.fao.org/apps/theme-4/. The share of cultivated land can be accessed from GAEZ v3 platform (https://www.gaez.iiasa.ac.at/)56. The shapefiles of the UK nations and England regions can be obtained from: https://geoportal.statistics.gov.uk/40,41. Land cover map 1990 of the UK can be retrieved from Digimap at https://digimap.edina.ac.uk/42. Other data will be made available from the corresponding author upon reasonable request.
References
Teixeira, E. I. et al. Global hot-spots of heat stress on agricultural crops due to climate change. Agr For. Meteorol. 170, 206–215. https://doi.org/10.1016/j.agrformet.2011.09.002 (2013).
Semenov, M. A. & Shewry, P. R. Modelling predicts that heat stress, not drought, will increase vulnerability of wheat in Europe. Sci. Rep. 1 (1), 66. https://doi.org/10.1038/srep00066 (2011).
Tran, B. L., Tseng, W. C. & Chen, C. C. Climate change impacts on crop yields across temperature rise thresholds and climate zones. Sci. Rep. 15 (1), 23424. https://doi.org/10.1038/s41598-025-07405-8 (2025).
Li, C. et al. Predicting changes in agricultural yields under climate change scenarios and their implications for global food security. Sci. Rep. 15 (1), 2858. https://doi.org/10.1038/s41598-025-87047-y (2025).
Zhang, Y. et al. Negative effects of heat stress on maize yield were compensated by increasing thermal time and declining cold stress in northeast China. Int. J. Biometeorol. 66 (12), 2395–2403. https://doi.org/10.1007/s00484-022-02363-6 (2022).
Lardon, A. & TriboiBlondel, A. M. Cold and freeze stress at flowering - Effects on seed yields in winter rapeseed. Field Crops Res. 44 (2–3), 95–101. https://doi.org/10.1016/0378-4290(95)00052-6 (1995).
Li, P. F. et al. Morphological and physiological responses of different wheat genotypes to chilling stress: a cue to explain yield loss. J. Sci. Food Agr. 97 (12), 4036–4045. https://doi.org/10.1002/jsfa.8271 (2017).
She, B. et al. Assessing and characterizing oilseed rape freezing injury based on MODIS and MERIS data. Int. J. Arg Biol. Eng. 10 (3), 143–157. https://doi.org/10.3965/j.ijabe.20171003.2721 (2017).
Secchi, M. A. et al. Effects of heat and drought on canola (Brassica napus L.) yield, oil, and protein: A meta-analysis. Field Crops Res. https://doi.org/10.1016/j.fcr.2023.108848 (2023).
Huang, R. Z. et al. Effects of heat stress during seed filling stage on Brassica napus seed oil accumulation and chlorophyll fluorescence characteristics. Phyton-Int J. Exp. Bot. https://doi.org/10.32604/phyton.2022.023252 (2022).
Batool, M. et al. Drought Stress in Brassica napus: Effects, Tolerance Mechanisms, and Management Strategies. J. Plant Growth Regul. 42 (1), 21–45. https://doi.org/10.1007/s00344-021-10542-9 (2022).
Hess, L., Meir, P. & Bingham, I. J. Comparative assessment of the sensitivity of oilseed rape and wheat to limited water supply. Ann. Appl. Biol. 167 (1), 102–115. https://doi.org/10.1111/aab.12212 (2015).
Haj Sghaier, A. et al. The effects of temperature and water on the seed germination and seedling development of rapeseed (Brassica napus L.). Plants (Basel) https://doi.org/10.3390/plants11212819 (2022).
Xiang, J. et al. Evaluation of the concentration-response relationship between film antitranspirant and yield of rapeseed (Brassica napus L.) under drought. Agric. Water Manag. https://doi.org/10.1016/j.agwat.2022.107732 (2022).
Knight, S. et al. Desk study to evaluate contributory causes of the current yield plateau in wheat and oilseed rape, AHDB Project Report No. 502, 2012. (2012).
Hess, L. Assessing the drought risk of oilseed rape to target future improvements to root systems (University of Edinburgh, 2011).
Xiang, J. Mitigation of drought damage to rapeseed (Brassica napus L.) from sprays of film antitranspirants at different concentrations (Harper Adams University, 2022).
Borges, C. E. et al. Forecasting Brassica napus production under climate change with a mechanistic species distribution model. Sci. Rep. 13 (1), 12656. https://doi.org/10.1038/s41598-023-38910-3 (2023).
Pullens, J. W. M. et al. Risk factors for European winter oilseed rape production under climate change. Agr For. Meteorol. 272, 30–39. https://doi.org/10.1016/j.agrformet.2019.03.023 (2019).
Yang, M. J. & Wang, G. L. Heat stress to jeopardize crop production in the US Corn Belt based on downscaled CMIP5 projections. Agr Syst. 211, 103746. https://doi.org/10.1016/j.agsy.2023.103746 (2023).
Crimp, S. J. et al. Recent seasonal and long-term changes in southern Australian frost occurrence. Clim. Change. 139 (1), 115–128. https://doi.org/10.1007/s10584-016-1763-5 (2016).
Butterworth, M. H. et al. North-South divide: Contrasting impacts of climate change on crop yields in Scotland and England. J. R. Soc. Interface 7(42), 123–30. https://doi.org/10.1098/rsif.2009.0111 (2010).
Meier, U. Growth Stages of Mono- and Dicotyledonous Plants: BBCH Monograph. (Julius Kühn-Institut, 2018).
Booth, E. J. & Gunstone, F. D. Rapeseeds and rapeseed oil: agronomy, production, and trade. Rapeseed and canola oil: production, processing, properties and uses (ed. by F.D. Gunstone), 1–16 (Blackwell, 2004).
AHDB. Oilseed rape growth guide. (2023).
Hoffman, R. & Gerber, M. Can rapeseed oil replace olive oil as part of a Mediterranean-style diet? Br. J. Nutr. 112 (11), 1882–1895. https://doi.org/10.1017/S0007114514002888 (2014).
Keane, B. J. et al. Greenhouse gas emissions from the energy crop oilseed rape (Brassica napus); the role of photosynthetically active radiation in diurnal N2O flux variation. GCB Bioenergy. 10 (5), 306–319. https://doi.org/10.1111/gcbb.12491 (2018).
Sulik, J. J. & Long, D. S. Spectral considerations for modeling yield of canola. Remote Sens. Environ. 184, 161–174. https://doi.org/10.1016/j.rse.2016.06.016 (2016).
Morrison, M. J. & Stewart, D. W. Heat stress during flowering in summer Brassica. Crop Sci. 42 (3), 797–803. https://doi.org/10.2135/cropsci2002.0797 (2002).
Trudgill, D. L., Squire, G. R. & Thompson, K. A thermal time basis for comparing the germination requirements of some British herbaceous plants. New. Phytol. 145 (1), 107–114. https://doi.org/10.1046/j.1469-8137.2000.00554.x (2000).
Marshall, B. & Squire, G. R. Non-linearity in rate-temperature relations of germination in oilseed rape. J. Eep Bot. 47 (302), 1369–1375. https://doi.org/10.1093/jxb/47.9.1369 (1996).
Brown, J. K. M., Beeby, R. & Penfield, S. Yield instability of winter oilseed rape modulated by early winter temperature. Sci. Rep. 9 (1), 6953. https://doi.org/10.1038/s41598-019-43461-7 (2019).
Lu, X. et al. Winter warming post floral initiation delays flowering via bud dormancy activation and affects yield in a winter annual crop. PNAS 119 (39), e2204355119. https://doi.org/10.1073/pnas.2204355119 (2022).
O’Neill, C. M. et al. Vernalization and Floral Transition in Autumn Drive Winter Annual Life History in Oilseed Rape. Curr. Biol. 29 (24), 4300–4306e2. https://doi.org/10.1016/j.cub.2019.10.051 (2019).
Evans, N. et al. Range and severity of a plant disease increased by global warming.. J. R. Soc. Interface 5(22), 525–31. https://doi.org/10.1098/rsif.2007.1136 (2008).
Basu, K. R. Improving seed quality in winter oilseed rape (University of Nottingham, 2002).
Chen, S. et al. Transient daily heat stress during the early reproductive phase disrupts pod and seed development in Brassica napus L.. Food Energy Secur. https://doi.org/10.1002/fes3.262 (2020).
Bathiany, S. et al. Increasing interannual climate variability during crop flowering in Europe.. Environ. Res. Lett. https://doi.org/10.1088/1748-9326/acc87e (2023).
Li, Z. Y. et al. A new framework to quantify maize production risk from chilling injury in Northeast China.. Clim. Risk Manag. https://doi.org/10.1016/j.crm.2021.100299 (2021).
ONS, Regions (December 2022) Boundaries EN BFE [Accessed 05/06/2023]. (2022).
ONS, Countries (December 2022) UK BFE [Accessed 05/06/2023]. (2022).
EDINA, Land Cover Map 1990 [FileGeoDatabase geospatial data], Scale 1:250000, Tiles: GB, Updated: 1 December 1990, CEH, Using: EDINA Environment Digimap Service, https://digimap.edina.ac.uk, Downloaded: 2023-11-09 09:30:39.451. (1990).
EDINA, Land Cover plus: Crops (2016) [FileGeoDatabase geospatial data], Scale 1:2500, Tiles: GB, Updated: 31 December 2016, CEH, Using: EDINA Environment Digimap Service, https://digimap.edina.ac.uk, Downloaded: 2023-03-10 10:53:30.178. (2016).
EDINA, Land Cover plus: Crops (2017) [FileGeoDatabase geospatial data], Scale 1:2500, Tiles: GB, Updated: 31 December 2017, CEH, Using: EDINA Environment Digimap Service, https://digimap.edina.ac.uk, Downloaded: 2023-03-10 10:53:30.184. (2017).
EDINA, Land Cover plus: Crops (2018) [FileGeoDatabase geospatial data], Scale 1:2500, Tiles: GB, Updated: 4 December 2018, CEH, Using: EDINA Environment Digimap Service, https://digimap.edina.ac.uk, Downloaded: 2023-03-10 10:53:30.196. (2018).
EDINA, Land Cover plus: Crops (2019) [FileGeoDatabase geospatial data], Scale 1:2500, Tiles: GB, Updated: 22 November 2019, CEH, Using: EDINA Environment Digimap Service, https://digimap.edina.ac.uk, Downloaded: 2023-03-10 10:53:30.191. (2019).
EDINA, Land Cover plus: Crops (2020) [FileGeoDatabase geospatial data], Scale 1:2500, Tiles: GB, Updated: 4 December 2020, CEH, Using: EDINA Environment Digimap Service, https://digimap.edina.ac.uk, Downloaded: 2023-03-10 10:53:30.203. (2020).
EDINA, Land Cover plus: Crops (2021) [FileGeoDatabase geospatial data], Scale 1:2500, Tiles: GB, Updated: 3 December 2021, CEH, Using: EDINA Environment Digimap Service, https://digimap.edina.ac.uk, Downloaded: 2023-03-10 10:53:30.209. (2021).
EDINA, Land Cover plus: Crops (2022) [FileGeoDatabase geospatial data], Scale 1:2500, Tiles: GB, Updated: 1 December 2022, CEH, Using: EDINA Environment Digimap Service, https://digimap.edina.ac.uk, Downloaded: 2023-03-10 10:53:30.207. (2022).
EDINA, Land Cover plus: Crops (2024) [FileGeoDatabase geospatial data], Scale 1:2500, Tiles: GB, Updated: 18 February 2025, CEH, Using: EDINA Environment Digimap Service, Downloaded: 2025-03-17 04:34:43.972. https://digimap.edina.ac.uk (2024).
EDINA, Land Cover plus: Crops (2023) [FileGeoDatabase geospatial data], Scale 1:2500, Tiles: GB, Updated: 29 January 2024, CEH, Using: EDINA Environment Digimap Service, Downloaded: 2025-02-08 13:20:17.235. https://digimap.edina.ac.uk (2023).
Defra, Cereal and oilseed rape production. (2024).
Hollis, D. et al. HadUK-Grid-A new UK dataset of gridded climate observations. Geosci. Data J. 6 (2), 151–159. https://doi.org/10.1002/gdj3.78 (2019).
Met Office et al. HadUK-Grid Gridded Climate Observations on a 1km grid over the UK, v1.2.0.0 (1836–2022). NERC EDS Centre for Environmental Data Analysis. https://doi.org/10.5285/46f8c1377f8849eeb8570b8ac9b26d86 (2022).
Fischer, G. et al. Global Agro-Ecological Zones v4 – Model documentation. https://doi.org/10.4060/cb4744en (FAO, 2021).
IIASA/FAO, Global Agro-ecological Zones (GAEZ v3.0). (IIASA and FAO, 2012).
Gall, S. et al. Mapping the option space for carbon sequestration, food and biodiversity in Great Britain. (2025).
Winkler, K. et al. Six decades of global crop yield increase and cropland expansion from 1960 to 2020. Environ. Res. Commun. 7 (5), 055013. https://doi.org/10.1088/2515-7620/add3cd (2025).
Lehner, A. & Philippe, D. A time-varying index for agricultural suitability across Europe from 1500–2000. Scientific Data 12(1), 101. https://doi.org/10.1038/s41597-024-04194-z (2025).
Snowdon, R., Lühs, W. & Friedt, W. In Oilseed Rape in: Chittaranjan K. [Ed], Genome Mapping and Molecular Breeding in Plants: Oilseeds Vol. 2 (ed. Kole, C.) 56–114 (Springer, 2006).
Miralles, D. J., Ferro, B. C. & Slafer, G. A. Developmental responses to sowing date in wheat, barley and rapeseed. Field Crops Res. 71 (3), 211–223. https://doi.org/10.1016/S0378-4290(01)00161-7 (2001).
Rezaei, E. E., Siebert, S. & Ewert, F. Climate and management interaction cause diverse crop phenology trends. Agr For. Meteorol. 233, 55–70. https://doi.org/10.1016/j.agrformet.2016.11.003 (2017).
Evans, N. et al. The impact of climate change on disease constraints on production of oilseed rape. Food Secur. 2 (2), 143–156. https://doi.org/10.1007/s12571-010-0058-3 (2010).
Ahmed, S. et al. Use of an unmanned aerial vehicle for monitoring and prediction of oilseed rape crop performance. PLoS One. 18 (11), e0294184. https://doi.org/10.1371/journal.pone.0294184 (2023).
Deligios, P. A. et al. Predicting growth and yield of winter rapeseed in a Mediterranean environment: Model adaptation at a field scale. Field Crops Res. 144, 100–112. https://doi.org/10.1016/j.fcr.2013.01.017 (2013).
IPCC, C. C. : Synthesis Report. Contribution of Working Groups I, II and III to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change [Core Writing Team, Pachauri, R.K and Reisinger, A. (eds.)]. 104 2007 (IPCC, 2007).
Sadras, V. & Dreccer, M. F. Adaptation of wheat, barley, canola, field pea and chickpea to the thermal environments of Australia. Crop Pasture Sci. 66 (11), 1137–1150. https://doi.org/10.1071/Cp15129 (2015).
Song, Y., Wang, J. & Wang, L. X. Satellite solar-induced chlorophyll fluorescence reveals heat stress impacts on wheat yield in India. Remote Sens. https://doi.org/10.3390/rs12203277 (2020).
Defra Cereal and oilseed rape production. (2023).
Core Team, R. R: A Language and Environment for Statistical Computing. (R Foundation for Statistical Computing, 2023).
Wickham, H., ggplot2: Elegant Graphics for Data Analysis. 1-212 https://doi.org/10.1007/978-0-387-98141-3 (Springer, 2016).
Woodcock, B. A. et al. Neonicotinoid residues in UK honey despite European Union moratorium. PLoS One. 13 (1), e0189681. https://doi.org/10.1371/journal.pone.0189681 (2018).
Kendon, M. et al. State of the UK Climate 2020. Weather 76 (9), 283–283. https://doi.org/10.1002/joc.7285 (2021).
de Magno Massuia Almeida, L. et al. To what extent can ecoclimatic indicators assist crop performance predictions in oilseed rape upon repeated heat stresses?. Eur. J. Agron. https://doi.org/10.1016/j.eja.2022.126622 (2022).
Tidy, A. C. et al. Large scale phenotyping on the effect of heat and cold stress on Brassica napus during floral development. Plant. Stress. 17, 100957. https://doi.org/10.1016/j.stress.2025.100957 (2025).
Jaime, R. et al. Climate change decreases suitable areas for rapeseed cultivation in Europe but provides new opportunities for white mustard as an alternative oilseed for biofuel production. PLoS One. 13 (11), e0207124. https://doi.org/10.1371/journal.pone.0207124 (2018).
Carozzi, M. et al. Effects of climate change in European croplands and grasslands: productivity, greenhouse gas balance and soil carbon storage. Biogeosciences 19 (12), 3021–3050. https://doi.org/10.5194/bg-19-3021-2022 (2022).
Pullens, J. W. M. et al. Model sensitivity of simulated yield of winter oilseed rape to climate change scenarios in Europe.. Eur. J. Agron. https://doi.org/10.1016/j.eja.2021.126341 (2021).
Slater, L. J. et al. Resilience of UK crop yields to compound climate change. Earth Syst. Dynam. 13 (3), 1377–1396. https://doi.org/10.5194/esd-13-1377-2022 (2022).
Martin, L. L. et al. The vulnerability of European agricultural areas to anthesis heat stress increases with climate change.. Environmental Research: Food Systems https://doi.org/10.1088/2976-601x/adb03d (2025).
Arnell, N. W. & Freeman, A. The effect of climate change on agro-climatic indicators in the UK.. Clim. Change https://doi.org/10.1007/s10584-021-03054-8 (2021).
Davie, J. C. S. et al. 2022 UK heatwave impacts on agrifood: implications for a climate-resilient food system. Front. Env. Sci. https://doi.org/10.3389/fenvs.2023.1282284 (2022).
Kourani, M. et al. Prolonged heat stress in Brassica napus during flowering negatively impacts yield and alters glucosinolate and sugars metabolism.. Front. Plant Sci. https://doi.org/10.3389/fpls.2025.1507338 (2025).
Bartošová, L. et al. Differences in phenological term changes in field crops and wild plants – do they have the same response to climate change in Central Europe?. Int. J. Biometeorol. 69(3), 659–670. https://doi.org/10.1007/s00484-024-02846-8 (2025).
White, J. et al. Canola yield sensitivity to climate indicators and passive microwave-derived soil moisture estimates in Saskatchewan, Canada. Agric. For. Meteorol. 268, 354–362. https://doi.org/10.1016/j.agrformet.2019.01.004 (2019).
Sun, W. et al. Projected long-term climate trends reveal the critical role of vapor pressure deficit for soybean yields in the US Midwest. Sci. Total Environ. 878, 162960–162960. https://doi.org/10.1016/j.scitotenv.2023.162960 (2023).
Hamarash, H., Rasul, A. & Hamad, R. A novel index for agricultural drought measurement: Soil moisture and evapotranspiration revealed drought index (SERDI). Climate 12(12), 209 (2024).
Xiang, J. et al. Evaluation of the concentration-response relationship between film antitranspirant and yield of rapeseed (Brassica napus L.) under drought.. Agric. Water Manag. https://doi.org/10.1016/j.agwat.2022.107732 (2022).
Meng, T. et al. Analyzing Temperature and Precipitation Influences on Yield Distributions of Canola and Spring Wheat in Saskatchewan. J. Appl. Meteorol. Clim. 56 (4), 897–913. https://doi.org/10.1175/Jamc-D-16-0258.1 (2017).
Webb, J. et al. Do UK crops and grassland require greater inputs of sulphur fertilizer in response to recent and forecast reductions in sulphur emissions and deposition?. Soil Use Manage. 32(1), 3–16. https://doi.org/10.1111/sum.12250 (2016).
Verdejo, J. F. & Calderini, D. F. Resilience of rapeseed to temperature increase during early grain filling in a high yielding environment.. Field Crops Res. 330, 109950. https://doi.org/10.1016/j.fcr.2025.109950 (2025).
Wu, W., Ma, B. L. & Whalen, J. K. Enhancing Rapeseed Tolerance to Heat and Drought Stresses in a Changing Climate: Perspectives for Stress Adaptation from Root System Architecture. 87–157. (2018).
Faraji, A. Flower formation and pod/flower ratio in canola (Brassica napus L.) affected by assimilates supply around flowering. Int. J. Plant. Prod. 4(4), 1735–8043 (2010).
Nishikawa, M. et al. Non-vernalization requirement for flowering in Brassica rapa conferred by a dominant allele of FLOWERING LOCUS T. Theor. Appl. Genet. 136 (6), 132. https://doi.org/10.1007/s00122-023-04378-y (2023).
O’Neill, B. C. et al. A new scenario framework for climate change research: the concept of shared socioeconomic pathways. Clim. Change. 122 (3), 387–400 (2014).
Büntgen, U. et al. Plants in the UK flower a month earlier under recent warming.. Proc. R. Soc. Lond. B Biol. Sci. https://doi.org/10.1098/rspb.2021.2456 (2022).
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This work was supported by the University of Dundee and China Scholarship Council Joint Scholarship program. The authors want to knowledge the assistance from proof-readers and editors.
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This work was supported by University of Dundee and China Scholarship Council Joint Scholarship program.
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BH, ACM, and MEJC developed the research idea and frameworks. BH identified the temperature thresholds and developed temperature stress indices. BH and ACM developed the R codes for processing the downloaded temperature dataset by using temperature stress indices. BH conducted data collection/curation/analysis and wrote the original paper. ACM and MEJC provided guidance and supervision for the project. All authors contributed to revising the manuscript.
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Hu, B., Cutler, M.E.J. & Morel, A.C. Spatiotemporal dynamics of heat stress and cold stress on UK rapeseed cropping over 1961–2020. Sci Rep (2026). https://doi.org/10.1038/s41598-026-41957-7
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DOI: https://doi.org/10.1038/s41598-026-41957-7