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The dimorphic diaspore model Aethionema arabicum (Brassicaceae): Distinct molecular and morphological control of responses to parental and germination temperatures
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SYSNO ASEP 0602120 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title The dimorphic diaspore model Aethionema arabicum (Brassicaceae): Distinct molecular and morphological control of responses to parental and germination temperatures Author(s) Chandler, J. O. (GB)
Wilhelmsson, P. K.I. (DE)
Fernandez-Pozo, N. (DE)
Graeber, K. (GB)
Arshad, W. (GB)
Pérez, M. (ES)
Steinbrecher, T. (GB)
Ullrich, K. K. (DE)
Nguyen, T. (AU)
Mérai, Z. (AT)
Mummenhoff, K. (DE)
Theissen, G. (DE)
Strnad, Miroslav (UEB-Q) RID, ORCID
Scheid, O. M. (CH)
Schranz, M. E. (NL)
Petřík, Ivan (UEB-Q) ORCID
Tarkowská, Danuše (UEB-Q) RID, ORCID
Novák, Ondřej (UEB-Q) RID, ORCID, SAI
Rensing, S. A. (DE)
Leubner-Metzger, Gerhard (UEB-Q) ORCIDNumber of authors 20 Source Title Plant Cell. - : Oxford University Press - ISSN 1040-4651
Roč. 36, č. 7 (2024), s. 2465-2490Number of pages 26 s. Language eng - English Country US - United States Keywords seed dormancy ; gene-expression ; abscisic-acid ; quantitative-analysis ; transcription factors ; aba sensitivity ; low-oxygen ; arabidopsis ; hypoxia ; pericarp OECD category Biochemical research methods R&D Projects EF16_019/0000738 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support UEB-Q - RVO:61389030 UT WOS 001202567600001 EID SCOPUS 85197553807 DOI https://doi.org/10.1093/plcell/koae085 Annotation Plants in habitats with unpredictable conditions often have diversified bet-hedging strategies that ensure fitness over a wider range of variable environmental factors. A striking example is the diaspore (seed and fruit) heteromorphism that evolved to maximize species survival in Aethionema arabicum (Brassicaceae) in which external and endogenous triggers allow the production of two distinct diaspores on the same plant. Using this dimorphic diaspore model, we identified contrasting molecular, biophysical, and ecophysiological mechanisms in the germination responses to different temperatures of the mucilaginous seeds (M+ seed morphs), the dispersed indehiscent fruits (IND fruit morphs), and the bare non-mucilaginous M- seeds obtained by pericarp (fruit coat) removal from IND fruits. Large-scale comparative transcriptome and hormone analyses of M+ seeds, IND fruits, and M- seeds provided comprehensive datasets for their distinct thermal responses. Morph-specific differences in co-expressed gene modules in seeds, as well as in seed and pericarp hormone contents, identified a role of the IND pericarp in imposing coat dormancy by generating hypoxia affecting abscisic acid (ABA) sensitivity. This involved expression of morph-specific transcription factors, hypoxia response, and cell wall remodeling genes, as well as altered ABA metabolism, transport, and signaling. Parental temperature affected ABA contents and ABA-related gene expression and altered IND pericarp biomechanical properties. Elucidating the molecular framework underlying the diaspore heteromorphism can provide insight into developmental responses to globally changing temperatures. Workplace Institute of Experimental Botany Contact David Klier, knihovna@ueb.cas.cz, Tel.: 220 390 469 Year of Publishing 2025 Electronic address https://doi.org/10.1093/plcell/koae085
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