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Genes & Genomics

, Volume 40, Issue 10, pp 1063–1068 | Cite as

Dependence and independence of the root clock on the shoot clock in Arabidopsis

  • Hong Gil Lee
  • Pil Joon Seo
Research Article

Abstract

Temporal and spatial compartmentalization of biological processes is facilitated by tissue-specific uncoupled circadian clocks in plants. However, interactions among tissue-specific circadian clocks have not been well established. The primary objective of this study was to describe both organ-specific circadian behaviors and centralized actions of the root clock. We analyzed transcript accumulation of circadianly-oscillating genes in roots and shoots. Expression of many clock components was different in roots and shoots. In particular, evening-expressed clock components were highly expressed in roots and likely play important roles in oscillation of the root clock. Consistent with this, the root and shoot clocks responded differentially to circadian gene mutations. The root clock was even dampened in gi-2 mutant. Circadian clocks basically oscillate in an organ-specific manner in plants, but the root clock also requires shoot-derived signals for organism-level coordination of circadian activity.

Keywords

Arabidopsis Circadian clock GIGANTEA Organ specificity Root clock 

Abbreviations

CCA1

CIRCADIAN CLOCK-ASSOCIATED 1

ELF

EARLY FLOWERING

GI

GIGANTEA

LHY

LATE ELONGATED HYPOCOTYL

ND

Neutral-day conditions

TOC1

TIMING OF CAB EXPRESSION 1

ZT

Zeitgeber time

Notes

Acknowledgements

This work was supported by the Basic Science Research (NRF-2016R1D1A1B03931139) and Basic Research Laboratory (NRF-2017R1A4A1015620) programs provided by the National Research Foundation of Korea and by the Cooperative Research Program for Agriculture Science and Technology Development (PJ01261303) provided by the Rural Development Administration.

Compliance with ethical standards

Conflict of interest

We have no conflict of interest to declare.

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Copyright information

© The Genetics Society of Korea and Springer Nature B.V. 2018

Authors and Affiliations

  1. 1.Department of Biological SciencesSungkyunkwan UniversitySuwonRepublic of Korea

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