한빛사 논문
Hyunwoo Cho1,7, Hojin Ryu1,7, Sangchul Rho2, Kristine Hill3,4, Stephanie Smith3, Dominique Audenaert5,6, Joonghyuk Park1, Soeun Han1, Tom Beeckman5,6, Malcolm J. Bennett3,4, Daehee Hwang2, Ive De Smet3,5,6 and Ildoo Hwang1,8
1Department of Life Sciences, Pohang University of Science and Technology, Pohang 790-784, Korea. 2School of Interdisciplinary Bioscience and Bioengineering, Pohang University of Science and Technology, Pohang 790-784, Korea. 3Division of Plant and Crop Sciences, School of Biosciences University of Nottingham, Sutton Bonington Campus, Loughborough LE12 5RD, UK. 4Centre for Plant Integrative Biology, University of Nottingham, Sutton Bonington Campus, Loughborough LE12 5RD, UK. 5Integrative Plant Biology Division, Department of Plant Systems Biology, VIB, Technologiepark 927, Ghent 9052, Belgium. 6Department of Plant Biotechnology and Bioinformatics, Ghent University, Technologiepark 927, Ghent 9052, Belgium. 7These authors contributed equally to this work.
8Correspondence should be addressed to I.H.
Abstract
The phytohormone auxin is a key developmental signal in plants. So far, only auxin perception has been described to trigger the release of transcription factors termed AUXIN RESPONSE FACTORs (ARFs) from their AUXIN/INDOLE-3-ACETIC ACID (AUX/IAA) repressor proteins. Here, we show that phosphorylation of ARF7 and ARF19 by BRASSINOSTEROID-INSENSITIVE2 (BIN2) can also potentiate auxin signalling output during lateral root organogenesis. BIN2-mediated phosphorylation of ARF7 and ARF19 suppresses their interaction with AUX/IAAs, and subsequently enhances the transcriptional activity to their target genes LATERAL ORGAN BOUNDARIES-DOMAIN16 (LBD16) and LBD29. In this context, BIN2 is under the control of the TRACHEARY ELEMENT DIFFERENTIATION INHIBITORY FACTOR (TDIF)?TDIF RECEPTOR (TDR) module. TDIF-initiated TDR signalling directly acts on BIN2-mediated ARF phosphorylation, leading to the regulation of auxin signalling during lateral root development. In summary, this study delineates a TDIF?TDR?BIN2 signalling cascade that controls regulation of ARF and AUX/IAA interaction independent of auxin perception during lateral root development.
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