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Deacclimation-Induced Changes of Photosynthetic Efficiency, Brassinosteroid Homeostasis and BRI1 Expression in Winter Oilseed Rape (Brassica napus L.)—Relation to Frost Tolerance
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SYSNO ASEP 0561453 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Deacclimation-Induced Changes of Photosynthetic Efficiency, Brassinosteroid Homeostasis and BRI1 Expression in Winter Oilseed Rape (Brassica napus L.)—Relation to Frost Tolerance Author(s) Stachurska, J. (PL)
Rys, M. (PL)
Pociecha, E. (PL)
Kalaji, H. M. (PL)
Dąbrowski, P. (PL)
Oklešťková, Jana (UEB-Q) RID, ORCID, SAI
Jurczyk, B. (PL)
Janeczko, A. (PL)Number of authors 8 Article number 5224 Source Title International Journal of Molecular Sciences. - : MDPI - ISSN 1661-6596
Roč. 23, č. 9 (2022)Number of pages 24 s. Language eng - English Country CH - Switzerland Keywords brassinosteroid insensitive 1 ; brassinosteroids ; dehardening ; delayed chlorophyll flu-orescence ; frost tolerance ; homocastasterone ; photosystem I ; photosystem II ; prompt chlorophyll fluorescence ; stress tolerance OECD category Biochemistry and molecular biology R&D Projects EF16_019/0000827 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support UEB-Q - RVO:61389030 UT WOS 000794497200001 EID SCOPUS 85129541236 DOI https://doi.org/10.3390/ijms23095224 Annotation The objective of this study was to answer the question of how the deacclimation process affects frost tolerance, photosynthetic efficiency, brassinosteroid (BR) homeostasis and BRI1 expression of winter oilseed rape. A comparative study was conducted on cultivars with different agronomic and physiological traits. The deacclimation process can occur when there are periods of higher temperatures, particularly in the late autumn or winter. This interrupts the process of the acclimation (hardening) of winter crops to low temperatures, thus reducing their frost tolerance and becoming a serious problem for agriculture. The experimental model included plants that were non-acclimated, cold acclimated (at 4◦C) and deacclimated (at 16◦C/9◦C, one week). We found that deacclimation tolerance (maintaining a high frost tolerance despite warm deacclimating periods) was a cultivar-dependent trait. Some of the cultivars developed a high frost tolerance after cold acclimation and maintained it after deacclimation. However, there were also cultivars that had a high frost tolerance after cold acclimation but lost some of it after deacclimation (the cultivars that were more susceptible to deacclimation). Deacclimation reversed the changes in the photosystem efficiency that had been induced by cold acclimation, and therefore, measuring the different signals associated with photosynthetic efficiency (based on prompt and delayed chlorophyll fluorescence) of plants could be a sensitive tool for monitoring the deacclimation process (and possible changes in frost tolerance) in oilseed rape. Higher levels of BR were characteristic of the better frost-tolerant cultivars in both the cold-acclimated and deacclimated plants. The relative expression of the BRI1 transcript (encoding the BR-receptor protein) was lower after cold acclimation and remained low in the more frost-tolerant cultivars after deacclimation. The role of brassinosteroids in oilseed rape acclimation/deacclimation is briefly discussed. Workplace Institute of Experimental Botany Contact David Klier, knihovna@ueb.cas.cz, Tel.: 220 390 469 Year of Publishing 2023 Electronic address https://doi.org/10.3390/ijms23095224
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