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Open AccessArticle

The Arabidopsis RLCK VI_A2 Kinase Controls Seedling and Plant Growth in Parallel with Gibberellin

1
Institute of Plant Biology, Biological Research Centre, 6726 Szeged, Hungary
2
Laboratory of Growth Regulators, Institute of Experimental Botany, Czech Academy of Sciences and Palacky University, 78371 Olomouc, Czech Republic
3
Department of Biochemistry and Molecular Biology, Faculty of Science and Informatics, University of Szeged, 6726 Szeged, Hungary
4
Doctoral School in Biology, Faculty of Science and Informatics, University of Szeged, 6726 Szeged, Hungary
5
Department of Plant Biology, Faculty of Science and Informatics, University of Szeged, 6726 Szeged, Hungary
*
Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2020, 21(19), 7266; https://doi.org/10.3390/ijms21197266
Received: 3 September 2020 / Revised: 24 September 2020 / Accepted: 29 September 2020 / Published: 1 October 2020
The plant-specific receptor-like cytoplasmic kinases (RLCKs) form a large, poorly characterized family. Members of the RLCK VI_A class of dicots have a unique characteristic: their activity is regulated by Rho-of-plants (ROP) GTPases. The biological function of one of these kinases was investigated using a T-DNA insertion mutant and RNA interference. Loss of RLCK VI_A2 function resulted in restricted cell expansion and seedling growth. Although these phenotypes could be rescued by exogenous gibberellin, the mutant did not exhibit lower levels of active gibberellins nor decreased gibberellin sensitivity. Transcriptome analysis confirmed that gibberellin is not the direct target of the kinase; its absence rather affected the metabolism and signalling of other hormones such as auxin. It is hypothesized that gibberellins and the RLCK VI_A2 kinase act in parallel to regulate cell expansion and plant growth. Gene expression studies also indicated that the kinase might have an overlapping role with the transcription factor circuit (PIF4-BZR1-ARF6) controlling skotomorphogenesis-related hypocotyl/cotyledon elongation. Furthermore, the transcriptomic changes revealed that the loss of RLCK VI_A2 function alters cellular processes that are associated with cell membranes, take place at the cell periphery or in the apoplast, and are related to cellular transport and/or cell wall reorganisation. View Full-Text
Keywords: Arabidopsis thaliana; cell expansion; gibberellins; hypocotyl growth; transcriptomic analysis; plant hormones; plant size; receptor-like cytoplasmic kinase; skotomorphogenesis Arabidopsis thaliana; cell expansion; gibberellins; hypocotyl growth; transcriptomic analysis; plant hormones; plant size; receptor-like cytoplasmic kinase; skotomorphogenesis
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MDPI and ACS Style

Valkai, I.; Kénesi, E.; Domonkos, I.; Ayaydin, F.; Tarkowská, D.; Strnad, M.; Faragó, A.; Bodai, L.; Fehér, A. The Arabidopsis RLCK VI_A2 Kinase Controls Seedling and Plant Growth in Parallel with Gibberellin. Int. J. Mol. Sci. 2020, 21, 7266. https://doi.org/10.3390/ijms21197266

AMA Style

Valkai I, Kénesi E, Domonkos I, Ayaydin F, Tarkowská D, Strnad M, Faragó A, Bodai L, Fehér A. The Arabidopsis RLCK VI_A2 Kinase Controls Seedling and Plant Growth in Parallel with Gibberellin. International Journal of Molecular Sciences. 2020; 21(19):7266. https://doi.org/10.3390/ijms21197266

Chicago/Turabian Style

Valkai, Ildikó; Kénesi, Erzsébet; Domonkos, Ildikó; Ayaydin, Ferhan; Tarkowská, Danuše; Strnad, Miroslav; Faragó, Anikó; Bodai, László; Fehér, Attila. 2020. "The Arabidopsis RLCK VI_A2 Kinase Controls Seedling and Plant Growth in Parallel with Gibberellin" Int. J. Mol. Sci. 21, no. 19: 7266. https://doi.org/10.3390/ijms21197266

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