The evening complex is central to the difference between the circadian clocks ofArabidopsis thalianashoots and roots
Open Access
- 1 July 2020
- journal article
- research article
- Published by Wiley in Physiologia Plantarum
- Vol. 169 (3), 442-451
- https://doi.org/10.1111/ppl.13108
Abstract
The circadian clock regulates the timing of many aspects of plant physiology, and this requires entrainment of the clock to the prevailing day:night cycle. Different plant cells and tissues can oscillate with different free-running periods, so coordination of timing across the plant is crucial. Previous work showed that a major difference between the clock in mature shoots and roots involves light inputs. The objective of this work was to define, inArabidopsis thaliana, the operation of the root clock in more detail, and in particular how it responds to light quality. Luciferase imaging was used to study the shoot and root clocks in several null mutants of clock components and in lines with aberrant expression of phytochromes. Mutations in each of the components of the evening complex (EARLY FLOWERING 3 and 4, and LUX ARRHYTHMO) were found to have specific effects on roots, by affecting either rhythmicity or period and its response to light quality. The data suggest that the evening complex is a key part of the light input mechanism that differs between shoots and roots and show that roots sense red light via phytochrome B.Funding Information
- Biotechnology and Biological Sciences Research Council (BB/K006835/1)
This publication has 43 references indexed in Scilit:
- A mobile ELF4 delivers circadian temperature information from shoots to rootsNature Plants, 2020
- Cryptochromes integrate green light signals into the circadian systemPlant, Cell & Environment, 2019
- The Circadian Clock Sets the Time of DNA Replication Licensing to Regulate Growth in ArabidopsisDevelopmental Cell, 2018
- The evening complex coordinates environmental and endogenous signals in ArabidopsisNature Plants, 2017
- Organ specificity in the plant circadian system is explained by different light inputs to the shoot and root clocksNew Phytologist, 2016
- Tissue-specific circadian clocks in plantsCurrent Opinion in Plant Biology, 2016
- BROTHER OF LUX ARRHYTHMO Is a Component of theArabidopsisCircadian ClockPlant Cell, 2011
- Global transcriptome analysis reveals circadian regulation of key pathways in plant growth and developmentGenome Biology, 2008
- A Complex Genetic Interaction BetweenArabidopsis thalianaTOC1 and CCA1/LHY in Driving the Circadian Clock and in Output RegulationGenetics, 2007
- Plant Circadian Clocks Increase Photosynthesis, Growth, Survival, and Competitive AdvantageScience, 2005