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Nat Commun. 2015 Jul 6;6:7641. doi: 10.1038/ncomms8641.

The circadian clock rephases during lateral root organ initiation in Arabidopsis thaliana.

Author information

1
Centre for Plant Integrative Biology, School of Biosciences, University of Nottingham, Sutton Bonington Campus, Sutton Bonington, Nottingham LE12 5RD, UK.
2
Department of Comparative and Functional Genomics, Institute of Integrative Biology, University of Liverpool, Liverpool L69 7ZB, UK.
3
Department of Plant Sciences, University of Cambridge, Cambridge CB2 3EA, UK.
4
Department of Environmental Science &Technology, College of Agriculture &Natural Resources, University of Maryland, College Park, Maryland 20742, USA.
5
1] Centre for Plant Integrative Biology, School of Biosciences, University of Nottingham, Sutton Bonington Campus, Sutton Bonington, Nottingham LE12 5RD, UK [2] Institut de Recherche pour le Développement, UMR DIADE, Montpellier 34394, France.
6
Departamento Anatomía, Biología Celular Y Zoología, Facultad de Ciencias, Universidad de Extremadura, Badajoz 06006, Spain.
7
1] Centre for Plant Integrative Biology, School of Biosciences, University of Nottingham, Sutton Bonington Campus, Sutton Bonington, Nottingham LE12 5RD, UK [2] UMR 7265 CEA, CNRS, Université d'Aix-Marseille, Laboratoire de Biologie du Développement des Plantes, Saint-Paul-lez-Durance 13108, France.
8
1] Centre for Plant Integrative Biology, School of Biosciences, University of Nottingham, Sutton Bonington Campus, Sutton Bonington, Nottingham LE12 5RD, UK [2] Department of Biology, Graduate School of Science, Kobe University, Kobe 657-8501, Japan.
9
Department of Biology, Graduate School of Science, Kobe University, Kobe 657-8501, Japan.
10
Institut de Recherche pour le Développement, UMR DIADE, Montpellier 34394, France.
11
1] School of Biological Sciences, University of Edinburgh, Edinburgh EH9 3JH, UK [2] SynthSys, CH Waddington Building, University of Edinburgh, Edinburgh EH9 3JD, UK.
12
Umea Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, Umea SE-901 83, Sweden.
13
Department of Plant Science and Landscape Architecture, University of Maryland, Maryland 20742, USA.

Abstract

The endogenous circadian clock enables organisms to adapt their growth and development to environmental changes. Here we describe how the circadian clock is employed to coordinate responses to the key signal auxin during lateral root (LR) emergence. In the model plant, Arabidopsis thaliana, LRs originate from a group of stem cells deep within the root, necessitating that new organs emerge through overlying root tissues. We report that the circadian clock is rephased during LR development. Metabolite and transcript profiling revealed that the circadian clock controls the levels of auxin and auxin-related genes including the auxin response repressor IAA14 and auxin oxidase AtDAO2. Plants lacking or overexpressing core clock components exhibit LR emergence defects. We conclude that the circadian clock acts to gate auxin signalling during LR development to facilitate organ emergence.

PMID:
26144255
PMCID:
PMC4506504
DOI:
10.1038/ncomms8641
[Indexed for MEDLINE]
Free PMC Article

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