Photosynthetic entrainment of the Arabidopsis thaliana circadian clock

Haydon, Michael J.; Mielczarek, Olga; Robertson, Fiona C.; Hubbard, Kevin M.; Webb, Alex A. R.

doi:10.1038/nature12603

Cited by 356 publications

(531 citation statements)

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“…We tested this because the prr7-11 mutation renders the oscillator insensitive to sugar signals that entrain the oscillator (Haydon et al, 2013), and the gi-11 mutation alters oscillator responses to long-term exposure to exogenous Suc (Dalchau et al, 2011). In all cases, gi-11 had longer hypocotyls than the wild type (Fig.…”

Section: Kin10 and Tps1 Are Required For Suc-induced Hypocotyl Elongamentioning

confidence: 99%

“…Because the circadian oscillator responds to exogenous and endogenous sugars (Dalchau et al, 2011;Haydon et al, 2013) and KIN10 overexpression can lengthen circadian period (Shin et al, 2017), we investigated whether Suc-induced increases in hypocotyl length under short photoperiods involve the circadian oscillator. First, we tested whether the circadian oscillator components CIRCADIAN CLOCK ASSOCI-ATED1 (CCA1), LATE ELONGATED HYPOCOTYL (LHY), and TIMING OF CAB2 EXPRESSION1 (TOC1) are required for Suc-induced hypocotyl elongation using the cca1-11 lhy-21 toc1-21 triple mutant (Ding et al, 2007).…”

Section: Kin10 and Tps1 Are Required For Suc-induced Hypocotyl Elongamentioning

confidence: 99%

“…We also investigated whether two proteins that confer sugar sensitivity to the circadian oscillator, GIGANTEA (GI) and PSEUDO-RESPONSE REGULA-TOR7 (PRR7; Dalchau et al, 2011;Haydon et al, 2013), contribute to Suc-induced hypocotyl elongation under short photoperiods. We tested this because the prr7-11 mutation renders the oscillator insensitive to sugar signals that entrain the oscillator (Haydon et al, 2013), and the gi-11 mutation alters oscillator responses to long-term exposure to exogenous Suc (Dalchau et al, 2011).…”

Section: Kin10 and Tps1 Are Required For Suc-induced Hypocotyl Elongamentioning

confidence: 99%

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The Energy-Signaling Hub SnRK1 Is Important for Sucrose-Induced Hypocotyl Elongation

et al. 2017

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Emerging seedlings respond to environmental conditions such as light and temperature to optimize their establishment. Seedlings grow initially through elongation of the hypocotyl, which is regulated by signaling pathways that integrate environmental information to regulate seedling development. The hypocotyls of Arabidopsis (Arabidopsis thaliana) also elongate in response to sucrose. Here, we investigated the role of cellular sugar-sensing mechanisms in the elongation of hypocotyls in response to Suc. We focused upon the role of SnRK1, which is a sugar-signaling hub that regulates metabolism and transcription in response to cellular energy status. We also investigated the role of TPS1, which synthesizes the signaling sugar trehalose-6-P that is proposed to regulate SnRK1 activity. Under light/dark cycles, we found that Suc-induced hypocotyl elongation did not occur in tps1 mutants and overexpressors of KIN10 (AKIN10/SnRK1.1), a catalytic subunit of SnRK1. We demonstrate that the magnitude of Suc-induced hypocotyl elongation depends on the day length and light intensity. We identified roles for auxin and gibberellin signaling in Suc-induced hypocotyl elongation under short photoperiods. We found that Suc-induced hypocotyl elongation under light/dark cycles does not involve another proposed sugar sensor, HEXOKINASE1, or the circadian oscillator. Our study identifies novel roles for KIN10 and TPS1 in mediating a signal that underlies Suc-induced hypocotyl elongation in light/dark cycles.

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Section: Kin10 and Tps1 Are Required For Suc-induced Hypocotyl Elongamentioning

confidence: 99%

Section: Kin10 and Tps1 Are Required For Suc-induced Hypocotyl Elongamentioning

confidence: 99%

Section: Kin10 and Tps1 Are Required For Suc-induced Hypocotyl Elongamentioning

confidence: 99%

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The Energy-Signaling Hub SnRK1 Is Important for Sucrose-Induced Hypocotyl Elongation

et al. 2017

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“…Recently, studies showed that the expression of the PRR7 gene, in addition to being regulated by light, also responds to the sugar levels originated from photosynthesis. Therefore, by dawn, with the beginning of the photosynthesis activity and the production of sugars, the expression of this transcription factor is induced (Haydon et al, 2013).…”

Section: Regulation Of the Circadian Clock In Plantsmentioning

confidence: 99%

Physiological and Genetic Bases of the Circadian Clock in Plants and Their Relationship with Herbicides Efficacy

Dalazen

Merotto

2016

Planta daninha

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-In order to adapt to daily environmental changes, especially in relation to light availability, many organisms, such as plants, developed a vital mechanism that controls time-dependent biological events: the circadian clock. The circadian clock is responsible for predicting the changes that occur in the period of approximately 24 hours, preparing the plants for the following phases of the cycle. Some of these adaptations can influence the response of weeds to the herbicide application. Thus, the objectives of this review are to describe the physiological and genetic mechanisms of the circadian clock in plants, as well as to demonstrate the relationship of this phenomenon with the effectiveness of herbicides for weed control. Relationships are described between the circadian clock and the time of application of herbicides, leaf angle and herbicide interception, as well as photosynthetic activity in response to the circadian clock and herbicide efficiency. Further, it is discussed the role of phytochrome B (phyB) in the sensitivity of plants to glyphosate herbicide. The greater understanding of the circadian clock in plants is essential to achieve greater efficiency of herbicides and hence greater control of weeds and higher crop yields.Keywords: time of herbicide application, weeds, photoreceptors, phytochromes. RESUMO -Para se adaptarem às variações ambientais diárias

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“…A recent report found that sugars repress the expression of the morning-expressed gene PSEUDORESPONSE REGULATOR 7 (PRR7) and activate the key component the central oscillator CCA1. 4 Similar to the high N condition, nitric oxide (NO) also causes the inhibition of floral transition through repressing circadian-clock output genes CO and GIGANTEA (GI). 5 In summary, N, C and NO may influence the circadian clock through the input pathway, the central oscillator pathway and the output pathway, respectively (Fig.…”

Section: Introductionmentioning

confidence: 99%