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Cytokinins act synergistically with heat acclimation to enhance rice thermotolerance affecting hormonal dynamics, gene expression and volatile emission
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SYSNO ASEP 0572057 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Cytokinins act synergistically with heat acclimation to enhance rice thermotolerance affecting hormonal dynamics, gene expression and volatile emission Author(s) Přerostová, Sylva (UEB-Q) RID, ORCID, SAI
Rezek, Jan (UEB-Q) RID, ORCID
Jarošová, Jana (UEB-Q) ORCID
Lacek, Jozef (UEB-Q) ORCID
Dobrev, Petre (UEB-Q) RID, ORCID
Maršík, Petr (UEB-Q) RID, ORCID
Gaudinová, Alena (UEB-Q) ORCID
Knirsch, Vojtěch (UEB-Q) ORCID
Doležal, Karel (UEB-Q) RID, ORCID
Plíhalová, Lucie (UEB-Q) ORCID, RID
Vaněk, Tomáš (UEB-Q) RID, ORCID
Kieber, J.J. (US)
Vaňková, Radomíra (UEB-Q) RID, ORCIDNumber of authors 13 Article number 107683 Source Title Plant Physiology and Biochemistry. - : Elsevier - ISSN 0981-9428
Roč. 198, MAY (2023)Number of pages 13 s. Language eng - English Country NL - Netherlands Keywords Acclimation ; Cytokinin ; Heat stress ; Phytohormone ; Priming ; Thermotolerance ; Volatile organic compound OECD category Plant sciences, botany R&D Projects LTAUSA17081 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) EF16_019/0000738 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GA20-22875S GA ČR - Czech Science Foundation (CSF) Method of publishing Open access Institutional support UEB-Q - RVO:61389030 UT WOS 000984583800001 EID SCOPUS 85152450491 DOI 10.1016/j.plaphy.2023.107683 Annotation Heat stress is a frequent environmental constraint. Phytohormones can significantly affect plant thermotolerance. This study compares the effects of exogenous cytokinin meta-topolin-9-(tetrahydropyran-2-yl)purine (mT9THP) on rice (Oryza sativa) under control conditions, after acclimation by moderate temperature (A, 37 °C, 2h), heat stress (HS, 45 °C, 6h) and their combination (AHS). mT9THP is a stable cytokinin derivative that releases active meta-topolin gradually, preventing the rapid deactivation reported after exogenous cytokinin application. Under control conditions, mT9THP negatively affected jasmonic acid in leaves and abscisic and salicylic acids in crowns (meristematic tissue crucial for tillering). Exogenous cytokinin stimulated the emission of volatile organic compounds (VOC), especially 2,3-butanediol. Acclimation upregulated trans-zeatin, expression of stress- and hormone-related genes, and VOC emission. The combination of acclimation and mT9THP promoted the expression of stress markers and antioxidant enzymes and moderately increased VOC emission, including 2-ethylhexyl salicylate or furanones. AHS and HS responses shared some common features, namely, increase of ethylene precursor aminocyclopropane-1-carboxylic acid (ACC), cis-zeatin and cytokinin methylthio derivatives, as well as the expression of heat shock proteins, alternative oxidases, and superoxide dismutases. AHS specifically induced jasmonic acid and auxin indole-3-acetic acid levels, diacylglycerolipids with fewer double bonds, and VOC emissions [e.g., acetamide, lipoxygenase (LOX)-derived volatiles]. Under direct HS, exogenous cytokinin mimicked some positive acclimation effects. The combination of mT9THP and AHS had the strongest thermo-protective effect, including a strong stimulation of VOC emissions (including LOX-derived ones). These results demonstrate for the first time the crucial contribution of volatiles to the beneficial effects of cytokinin and AHS on rice thermotolerance. Workplace Institute of Experimental Botany Contact David Klier, knihovna@ueb.cas.cz, Tel.: 220 390 469 Year of Publishing 2024 Electronic address https://doi.org/10.1016/j.plaphy.2023.107683
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