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Journal Article

miR156-regulated SPL transcription factors define an endogenous flowering pathway in Arabidopsis thaliana

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Wang,  J-W
Department Molecular Biology, Max Planck Institute for Developmental Biology, Max Planck Society;

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Czech,  B
Department Molecular Biology, Max Planck Institute for Developmental Biology, Max Planck Society;

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Weigel,  D
Department Molecular Biology, Max Planck Institute for Developmental Biology, Max Planck Society;

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Citation

Wang, J.-W., Czech, B., & Weigel, D. (2009). miR156-regulated SPL transcription factors define an endogenous flowering pathway in Arabidopsis thaliana. Cell, 138(4), 738-749. doi:10.1016/j.cell.2009.06.014.


Cite as: https://hdl.handle.net/21.11116/0000-000A-EDA9-D
Abstract
The FT gene integrates several external and endogenous cues controlling flowering, including information on day length. A complex of the mobile FT protein and the bZIP transcription factor FD in turn has a central role in activating genes that execute the switch from vegetative to reproductive development. Here we reveal that microRNA156-targeted SQUAMOSA PROMOTER BINDING PROTEIN-LIKE (SPL) genes not only act downstream of FT/FD, but also define a separate endogenous flowering pathway. High levels of miR156 in young plants prevent precocious flowering. A subsequent day length-independent decline in miR156 abundance provides a permissive environment for flowering and is paralleled by a rise in SPL levels. At the shoot apex, FT/FD and SPLs converge on an overlapping set of targets, with SPLs directly activating flower-promoting MADS box genes, providing a molecular substrate for both the redundant activities and the feed-forward action of the miR156/SPL and FT/FD modules in flowering control.