Long-Term High-Temperature Stress Impacts on Embryo and Seed Development in Brassica napus

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Authors

MÁCOVÁ Kateřina PRABHULLACHANDRAN Unnikannan ŠTEFKOVÁ Marie SPYROGLOU Ioannis PĚNČÍK Aleš ENDLOVÁ Lenka NOVÁK Ondřej ROBERT BOISIVON Helene

Year of publication 2022
Type Article in Periodical
Magazine / Source Frontiers in Plant Science
MU Faculty or unit

Central European Institute of Technology

Citation
Web https://www.frontiersin.org/articles/10.3389/fpls.2022.844292/full
Doi http://dx.doi.org/10.3389/fpls.2022.844292
Keywords Brassica napus; embryo development; high temperatures; hormonal profiling; oil content; seed development; thermomorphogenesis
Attached files
Description Brassica napus (rapeseed) is the second most important oilseed crop worldwide. Global rise in average ambient temperature and extreme weather severely impact rapeseed seed yield. However, fewer research explained the phenotype changes caused by moderate-to-high temperatures in rapeseed. To investigate these events, we determined the long-term response of three spring cultivars to different temperature regimes (21/18°C, 28/18°C, and 34/18°C) mimicking natural temperature variations. The analysis focused on the plant appearance, seed yield, quality and viability, and embryo development. Our microscopic observations suggest that embryonic development is accelerated and defective in high temperatures. Reduced viable seed yield at warm ambient temperature is due to a reduced fertilization rate, increased abortion rate, defective embryonic development, and pre-harvest sprouting. Reduced auxin levels in young seeds and low ABA and auxin levels in mature seeds may cause embryo pattern defects and reduced seed dormancy, respectively. Glucosinolates and oil composition measurements suggest reduced seed quality. These identified cues help understand seed thermomorphogenesis and pave the way to developing thermoresilient rapeseed.
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