Abstract
Key message
miR394 regulates Arabidopsis flowering time in a LCR-independent manner. Arabidopsis plants harboring mutations in theMIR394 genes exhibit early flowering, lower expression of floral repressor FLC and higher expression of floral integrators FT and SOC1.
Abstract
Plant development occurs throughout its entire life cycle and involves a phase transition between vegetative and reproductive phases, leading to the flowering process, fruit formation and ultimately seed production. It has been shown that the microRNA394 (miR394) regulates the accumulation of the transcript coding for LEAF CURLING RESPONSIVENESS, a member of a family of F-Box proteins. The miR394 pathway regulates several processes including leaf morphology and development of the shoot apical meristem during embryogenesis, as well as having been assigned a role in the response to biotic and abiotic stress in Arabidopsis thaliana and other species. Here, we characterized plants harboring mutations in MIR394 precursor genes and demonstrate that mir394a mir394b double mutants display an early flowering phenotype which correlates with a lower expression of FLOWERING LOCUS C earlier in development and higher expression of the floral integrators FLOWERING LOCUS T and SUPPRESSOR OF OVEREXPRESSION OF CONSTANS 1. Consequently, mutant plants produce fewer branches and exhibit lower seed production. Our work reveals previously unknown developmental aspects regulated by the miR394 pathway, in an LCR-independent manner, contributing to the characterization of the multiple roles of this versatile plant regulatory miRNA.
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Acknowledgements
The authors thank Marja Timmermans (University of Tübingen, Germany) for providing mutant and transgenic lines analyzed in this work. This research was supported by grants from Fondo para la Investigación Científica y Tecnológica (FONCyT), PICT 2015‐0198 and PICT 2018-1090 to M. D.
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This work was supported by grants from Fondo para la Investigación Científica y Tecnológica (FONCyT), PICT 2015‐0198 and PICT 2018–1090 to M. D.
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MD was responsible for study conception and design. Material preparation, data collection and analysis were performed by YB, MAP, FB and AV. The first draft of the manuscript was written by MD and YB, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Bernardi, Y., Ponso, M.A., Belén, F. et al. MicroRNA miR394 regulates flowering time in Arabidopsis thaliana. Plant Cell Rep 41, 1375–1388 (2022). https://doi.org/10.1007/s00299-022-02863-0
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DOI: https://doi.org/10.1007/s00299-022-02863-0