Heat stress affects floral morphology, silique set and seed quality in chamber and field grown winter canola

Abstract

Canola (Brassica napus L.), also known as oilseed rape or double-low rapeseed, is currently one of the most productive and important oilseed crops grown worldwide (Zhang & Flottmann, 2016). The increasing threat of climate change is already having a substantial impact on agricultural production worldwide, as heat waves can cause significant yield losses (Gornall et al., 2010). Over the past century, global mean air temperature has increased by 0.5°C which is predicted to further increase by 1.5-4.5°C by 2100 (IPCC, 2014). Further, the daily minimum temperature is reported to be rapidly increasing at twice the rate of the daily maximum tempera-

Short‐term heat stress during flowering results in a decline in Canola seed productivity

“…However, Elferjani and Soolanayakanahally (2018) reported a decrease in the oleic acid content and increased linoleic acid and the saturated fatty acid fraction due to heat stress. Increased saturated (palmitic and stearic) fatty acids without significant changes in unsaturated fatty acids (oleic, linoleic, linolenic) in B. napus in response to high night temperature reported by Pokharel et al (2021). Overall, our results and…”

“…We observed lighter in colour shrunken and irregularly shaped seeds in heat‐stressed plants. Previous studies have also reported that heat stress during flowering in Brassica species results in yield loss exclusively due to a reduction in seed mass potentially due to reduced seed filling duration or increased rate of seed filling (Aksouh‐Harradj et al., 2006; Chen et al., 2021; Gan et al., 2004; Morrison & Stewart, 2002; Pokharel et al., 2021; Rashid et al., 2018; Young et al., 2004; Yu et al., 2014). Our findings indicate that seeds failed to mature properly in some pods.…”

“…Over the past decades, studies have elucidated the physiological impacts and molecular mechanisms of B . napus responses to prolonged high‐temperature treatments or comparatively shorter high‐temperature treatments during the reproductive stages (Aksouh‐Harradj et al., 2006; Angadi et al., 2000; Kirkegaard et al., 2018; Lohani et al., 2020a, 2020b; Pokharel et al., 2021; Singh et al., 2021; Uppal et al., 2019). In the present work, we exposed plants to high temperature lasting only 12h during flowering to study the impact of a short heat stress episode on reproductive fitness and yield in a commercial Canola variety AV Garnet.…”

“…Temperatures above the threshold during reproductive development in Canola can adversely affect flower development, pollination, fertilisation, oil synthesis/accumulation, and grain filling (Angadi et al, 2000;Kirkegaard, Lilley, Brill, Ware, & Walela, 2018;Lohani, Singh, & Bhalla, 2020b; M. J. Morrison & Stewart, 2002;Pokharel, Stamm, Hein, & Jagadish, 2021;Polowick & Sawhney, 1988;Singh & Bhalla 2007;S. Singh, Kakani, Brand, Baldwin, & Reddy, 2008;Uppal, Brill, & Bromfield, 2019).…”

Assimilation of Multisensor Optical and Multiorbital SAR Satellite Data in a Simplified Agrometeorological Model for Rapeseed Crops Monitoring

“…Studied fields are no significantly prone to weeds infestation and the rapeseed cultivars authorized in France show generally little phenotypic variability. Nevertheless, [65] also demonstrated the high phenotypic plasticity of rapeseed under short heat stress. Such a plasticity that can possibly occurs under other type of stress or agricultural practices, could also partly explain the absence of correlation between total aboveground dry mass and rapeseed yields observed in this study.…”