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

Ute Voss, Michael Wilson, Kim Kenobi, Peter Gould, Fiona Robertson, Wendy Peer, Mikael Lucas, Kamal Swarup, Ilda Casimoro, Tara Holman, Darren Wells, Benjamin Peret, Tatsuaki Goh, Hidehiro Fukaki, Charlie Hodgman, Laurent Laplaze, Karen Halliday, Karin Ljung, Angus Murphy, Anthony Hall

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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.
Original languageEnglish
JournalNature Communications
Publication statusPublished - 06 Jul 2015


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