Molecular mechanisms at the core of the plant circadian oscillator

Nohales, María A.; Kay, Steve A.

doi:10.1038/nsmb.3327

Cited by 238 publications

(247 citation statements)

References 109 publications

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“…In higher plants, circadian clocks play crucial roles in regulating numerous biological processes, including gene expression, photosynthesis, water use, and flowering (Harmer, 2000;Nohales and Kay, 2016). An important characteristic of circadian clocks is their entrainment to environmental time cues (zeitgebers) such as changes in external light and temperature cycles (Nakamichi et al, 2004;Higashi et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal Analysis of Localized Circadian Arrhythmias in Plant Roots

Seki

Tanigaki

Yoshida

et al. 2018

Environmental Control in Biology

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The circadian system in plants is characterized by substantial cellular oscillations over an approximately 24-h period. Interactions between cellular oscillators trigger phase resets near the root meristem, resulting in localized regions of arrhythmic expression of the clock gene CCA1. The arrhythmicity of the circadian rhythm significantly impacts physiologic processes and growth; however, the exact nature of these arrhythmic regions remains unknown. In this study, we analyzed spatiotemporal patterns in CCA1 expression in arrhythmic regions using a nondestructive imaging technique. We found that formation of root arrhythmic regions involves the emergence of small spiral waves. Near the small spiral waves, the synchrony of cellular oscillations was low. Our findings provide experimental evidence that the arrhythmias are based on desynchronization of cellular oscillators and enhance our understanding of the role of circadian phenomena in root growth.

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Section: Introductionmentioning

confidence: 99%

Spatiotemporal Analysis of Localized Circadian Arrhythmias in Plant Roots

Seki

Tanigaki

Yoshida

et al. 2018

Environmental Control in Biology

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“…The Arabidopsis (Arabidopsis thaliana) oscillator consists of interlocking feedback loops (reviewed in Hsu and Harmer, 2014;Nohales and Kay, 2016). The first loop to be described comprises CIRCADIAN CLOCK ASSOCIATED1 (CCA1), LATE ELONGATED HYPOCOTYL (LHY), TIMING OF CAB EXPRESSION1 (TOC1; also known as PSEUDO-RESPONSE REGULATOR1 [PRR1]), and CCA1 HIKING EXPEDITION (CHE).…”

mentioning

confidence: 99%

CIRCADIAN CLOCK ASSOCIATED1 (CCA1) and the Circadian Control of Stomatal Aperture

et al. 2017

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The endogenous circadian (;24 h) system allows plants to anticipate and adapt to daily environmental changes. Stomatal aperture is one of the many processes under circadian control; stomatal opening and closing occurs under constant conditions, even in the absence of environmental cues. To understand the significance of circadian-mediated anticipation in stomatal opening, we have generated SGC (specifically guard cell) Arabidopsis (Arabidopsis thaliana) plants in which the oscillator gene CIRCADIAN CLOCK ASSOCIATED1 (CCA1) was overexpressed under the control of the guard-cell-specific promoter, GC1. The SGC plants showed a loss of ability to open stomata in anticipation of daily dark-to-light changes and of circadian-mediated stomatal opening in constant light. We observed that under fully watered and mild drought conditions, SGC plants outperform wild type with larger leaf area and biomass. To investigate the molecular basis for circadian control of guard cell aperture, we used large-scale qRT-PCR to compare circadian oscillator gene expression in guard cells compared with the "average" whole-leaf oscillator and examined gene expression and stomatal aperture in several lines of plants with misexpressed CCA1. Our results show that the guard cell oscillator is different from the average plant oscillator. Moreover, the differences in guard cell oscillator function may be important for the correct regulation of photoperiod pathway genes that have previously been reported to control stomatal aperture. We conclude by showing that CONSTANS and FLOWERING LOCUS T, components of the photoperiod pathway that regulate flowering time, also control stomatal aperture in a daylength-dependent manner.

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“…; McWatters et al . ; McClung ; Hsu & Harmer ; Nohales & Kay ). For plants, timing of the photosynthetic process to the light period is critical for maximum energy uptake and biomass production.…”

Section: Introductionmentioning

confidence: 99%

On the move through time – a historical review of plant clock research

Johansson

Köster

2018

Plant Biol J

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The circadian clock is an important regulator of growth and development that has evolved to help organisms to anticipate the predictably occurring events on the planet, such as light-dark transitions, and adapt growth and development to these. This review looks back in history on how knowledge about the endogenous biological clock has been acquired over the centuries, with a focus on discoveries in plants. Key findings at the physiological, genetic and molecular level are described and the role of the circadian clock in important molecular processes is reviewed.

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Molecular mechanisms at the core of the plant circadian oscillator

Cited by 238 publications

References 109 publications

Spatiotemporal Analysis of Localized Circadian Arrhythmias in Plant Roots

Spatiotemporal Analysis of Localized Circadian Arrhythmias in Plant Roots

CIRCADIAN CLOCK ASSOCIATED1 (CCA1) and the Circadian Control of Stomatal Aperture

On the move through time – a historical review of plant clock research

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