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Voß, Ute and Wilson, Michael H. and Kenobi, Kim and Gould, Peter D. and Robertson, Fiona C. and Peer, Wendy A. and Lucas, Mikaël and Swarup, Kamal and Casimiro, Ilda and Holman, Tara J. and Wells, Darren M. and Péret, Benjamin and Goh, Tatsuaki and Fukaki, Hidehiro and Hodgman, T. Charlie and Laplaze, Laurent and Halliday, Karen J. and Ljung, Karin and Murphy, Angus S. and Hall, Anthony J. and Webb, Alex A. R. and Bennett, Malcolm J. (2015) The circadian clock rephases during lateral root organ initiation in Arabidopsis thaliana. Nature Communications, 6 . 7641/1-7641/9. ISSN 2041-1723

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.

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