A Hierarchical Multi-oscillator Network Orchestrates the Arabidopsis Circadian System

Takahashi, Nobuhiro; Hirata, Yoshito; Aihara, Kazuyuki; Más, Paloma Díaz

doi:10.1016/j.cell.2015.12.002

Cited by 21 publications

(56 citation statements)

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“…The photosynthetic tissues above ground are likely to generate large carbohydrate fluxes, influencing transport and storage below ground (in the dark). The circadian clock does run in the roots, but requires signaling from the shoot and can be promoted by sucrose (Takahashi et al 2015). This is consistent with the observed influence of sugar on clock oscillations in both dark and light grown seedlings, and that daily sugar pulses from photosynthesis can set and maintain the clock (Haydon et al 2013).…”

Section: Dark Signaling In Plants 2495supporting

confidence: 83%

Dancing in the dark: darkness as a signal in plants

Seluzicki

Burko

Chory

2017

Plant Cell & Environment

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Daily cycles of light and dark provide an organizing principle and temporal constraints under which life on Earth evolved. While light is often the focus of plant studies, it is only half the story. Plants continuously adjust to their surroundings, taking both dawn and dusk as cues to organize their growth, development and metabolism to appropriate times of day. In this review, we examine the effects of darkness on plant physiology and growth. We describe the similarities and differences between seedlings grown in the dark versus those grown in light–dark cycles, and the evolution of etiolated growth. We discuss the integration of the circadian clock into other processes, looking carefully at the points of contact between clock genes and growth-promoting gene-regulatory networks in temporal gating of growth. We also examine daily starch accumulation and degradation, and the possible contribution of dark-specific metabolic controls in regulating energy and growth. Examining these studies together reveals a complex and continuous balancing act, with many signals, dark included, contributing information and guiding the plant through its life cycle. The extraordinary interconnection between light and dark is manifest during cycles of day and night and during seedling emergence above versus below the soil surface.

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Section: Dark Signaling In Plants 2495supporting

confidence: 83%

Dancing in the dark: darkness as a signal in plants

Seluzicki

Burko

Chory

2017

Plant Cell & Environment

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“…The circadian oscillators of higher plant perform their function independently in individual tissue or organ, and tissuespecific clocks coordinate with each other, showing asymmetric coupling in Arabidopsis (Thain et al, 2000;Wenden et al, 2012;Endo et al, 2014;Takahashi et al, 2015). The clock in the shoot apex plays a dominant role in a long-distance pattern of synchronization between organs, but the circadian function in root has not been well studied.…”

Section: Discussionmentioning

confidence: 99%

“…Similar to mammals, core oscillators of different organs also have variations in clock precision, and circadian coupling are necessary for the synchronization in whole individual (James et al, 2008;Wenden et al, 2012;Endo et al, 2014;Takahashi et al, 2015). Here, we examined the endogenous oscillation of GmLCL and GmPRR transcript accumulation in unifoliate leaves and roots ( Figure S3-4).…”

Section: Robust Circadian Expression Of Clock Genes In Soybean Hairmentioning

confidence: 99%

“…Studies of plant circadian clocks have largely focused on the hierarchical multi-oscillator network in Arabidopsis thaliana, which comprises multiple feedback loops (Takahashi et al, 2015). The earlymorning expressed Myb transcription factors CIRCADIAN CLOCK-ASSOCIATED 1 (CCA1) and LONG ELONGATED HYPOCOTYL (LHY), via their recruitment of DEETIOLATED1 (DET1), negatively regulate the expression of evening-phased clock genes such as TIMING OF CAB EXPRESSION 1 (TOC1, also known as PRR1), PSEUDO-RESPONSE REGULATOR 5 (PRR5), LUX ARRHYTHMO (LUX), EARLY FLOWERING 4 (ELF4), EARLY FLOWERING 3 (ELF3), and GIGANTEA (GI) (Alabadí et al, 2001;Hazen et al, 2005;Pruneda-Paz et al, 2009;Kamioka et al, 2016).…”

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confidence: 99%

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Light‐ and temperature‐entrainable circadian clock in soybean development

Wang

et al. 2019

Plant Cell & Environment

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In plants, the spatiotemporal expression of circadian oscillators provides adaptive advantages in diverse species. However, the molecular basis of circadian clock in soybean is not known. In this study, we used soybean hairy roots expression system to monitor endogenous circadian rhythms and the sensitivity of circadian clock to environmental stimuli. We discovered in experiments with constant light and temperature conditions that the promoters of clock genes GmLCLb2 and GmPRR9b1 drive a self‐sustained, robust oscillation of about 24‐h in soybean hairy roots. Moreover, we demonstrate that circadian clock is entrainable by ambient light/dark or temperature cycles. Specifically, we show that light and cold temperature pulses can induce phase shifts of circadian rhythm, and we found that the magnitude and direction of phase responses depends on the specific time of these two zeitgeber stimuli. We obtained a quadruple mutant lacking the soybean gene GmLCLa1, LCLa2, LCLb1, and LCLb2 using CRISPR, and found that loss‐of‐function of these four GmLCL orthologs leads to an extreme short‐period circadian rhythm and late‐flowering phenotype in transgenic soybean. Our study establishes that the morning‐phased GmLCLs genes act constitutively to maintain circadian rhythmicity and demonstrates that their absence delays the transition from vegetative growth to reproductive development.

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“…The vascular cell clocks showed robust oscillations without environmental cues and were able to affect circadian clock regulation in adjacent tissues (Endo et al 2014). Other studies have suggested that the shoot apex cell clocks are highly synchronised and able to influence the root cell clocks (Takahashi et al 2015). A recent report also suggest that light signals travelling from shoots to roots can synchronise the clocks in the different tissues (Nimmo 2018).…”

Section: Setup Of the Clock On A Whole Plant Levelmentioning

confidence: 97%

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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A Hierarchical Multi-oscillator Network Orchestrates the Arabidopsis Circadian System

Cited by 21 publications

References 0 publications

Dancing in the dark: darkness as a signal in plants

Dancing in the dark: darkness as a signal in plants

Light‐ and temperature‐entrainable circadian clock in soybean development

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

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