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J Exp Bot. 2017 Jun 15;68(13):3391-3403. doi: 10.1093/jxb/erx184.

FRUITFULL controls SAUR10 expression and regulates Arabidopsis growth and architecture.

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Laboratory of Molecular Biology, Wageningen University & Research, Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands.
Department of Biology, Institute of Biology, Humboldt University, Berlin, Germany.
Instituto de Biología Molecular y Celular de Plantas (IBMCP),Universidad Politécnica de Valencia (UPV)-Consejo Superior de Investigaciones Científicas (CSIC). Ciudad Politécnica de la Innovación (CPI), Ed. 8E C/ Ingeniero Fausto Elio s/n, 46022 Valencia, Spain.
Institute for Biochemistry and Biology, Potsdam University, Potsdam, Germany.
Laboratory of Molecular Biology and Business Unit Bioscience, Wageningen University & Research, 6708 PB Wageningen, The Netherlands.


MADS-domain transcription factors are well known for their roles in plant development and regulate sets of downstream genes that have been uncovered by high-throughput analyses. A considerable number of these targets are predicted to function in hormone responses or responses to environmental stimuli, suggesting that there is a close link between developmental and environmental regulators of plant growth and development. Here, we show that the Arabidopsis MADS-domain factor FRUITFULL (FUL) executes several functions in addition to its noted role in fruit development. Among the direct targets of FUL, we identified SMALL AUXIN UPREGULATED RNA 10 (SAUR10), a growth regulator that is highly induced by a combination of auxin and brassinosteroids and in response to reduced R:FR light. Interestingly, we discovered that SAUR10 is repressed by FUL in stems and inflorescence branches. SAUR10 is specifically expressed at the abaxial side of these branches and this localized activity is influenced by hormones, light conditions and by FUL, which has an effect on branch angle. Furthermore, we identified a number of other genes involved in hormone pathways and light signalling as direct targets of FUL in the stem, demonstrating a connection between developmentally and environmentally regulated growth programs.


Architecture; FRUITFULL; MADS-box transcription factor; SAUR; auxin; branching; growth; hormones; light response

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