A Functional Connection between the Circadian Clock and Hormonal Timing in Arabidopsis

Singh, Mridweeka; Más, Paloma Díaz

doi:10.3390/genes9120567

Cited by 28 publications

(29 citation statements)

References 131 publications

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“…The photoperiodic signal controlling seasonal growth dynamics in trees is perceived by the leaves (24). Plants are thereby able to "measure" time (daylength) by an internal time-keeping mechanism, the circadian clock (24,32). Therefore, the first mechanism introduced to explain how photoperiod perception by the foliage played this dominant role in wood formation in the tree stem is that the circadian clock differentially regulates systems of phytohormones, such as auxin (indole-acetic acid) and cytokinins (32,33).…”

Section: Discussionmentioning

confidence: 99%

“…Plants are thereby able to "measure" time (daylength) by an internal time-keeping mechanism, the circadian clock (24,32). Therefore, the first mechanism introduced to explain how photoperiod perception by the foliage played this dominant role in wood formation in the tree stem is that the circadian clock differentially regulates systems of phytohormones, such as auxin (indole-acetic acid) and cytokinins (32,33). These hormones are exported from source tissues (mainly apical meristems and actively growing leaves) and serve as mobile signals that regulate cambial cell division and xylem development (34,35).…”

Section: Discussionmentioning

confidence: 99%

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Photoperiod and temperature as dominant environmental drivers triggering secondary growth resumption in Northern Hemisphere conifers

Huang¹,

Ma²,

Rossi³

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

137

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Wood formation consumes around 15% of the anthropogenic CO2 emissions per year and plays a critical role in long-term sequestration of carbon on Earth. However, the exogenous factors driving wood formation onset and the underlying cellular mechanisms are still poorly understood and quantified, and this hampers an effective assessment of terrestrial forest productivity and carbon budget under global warming. Here, we used an extensive collection of unique datasets of weekly xylem tissue formation (wood formation) from 21 coniferous species across the Northern Hemisphere (latitudes 23 to 67°N) to present a quantitative demonstration that the onset of wood formation in Northern Hemisphere conifers is primarily driven by photoperiod and mean annual temperature (MAT), and only secondarily by spring forcing, winter chilling, and moisture availability. Photoperiod interacts with MAT and plays the dominant role in regulating the onset of secondary meristem growth, contrary to its as-yet-unquantified role in affecting the springtime phenology of primary meristems. The unique relationships between exogenous factors and wood formation could help to predict how forest ecosystems respond and adapt to climate warming and could provide a better understanding of the feedback occurring between vegetation and climate that is mediated by phenology. Our study quantifies the role of major environmental drivers for incorporation into state-of-the-art Earth system models (ESMs), thereby providing an improved assessment of long-term and high-resolution observations of biogeochemical cycles across terrestrial biomes.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Photoperiod and temperature as dominant environmental drivers triggering secondary growth resumption in Northern Hemisphere conifers

Huang¹,

Ma²,

Rossi³

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

137

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“…Various abiotic stresses, such as heat, cold, salinity, and dehydration, affect the circadian expression of stress-responsive genes (Covington et al, 2008;Singh and Mas, 2018). The expression of genes involved in biosynthesis of the phytohormone ABA and regulating drought stress response is under control of the circadian clock (Nambara and Marion-Poll, 2005;Agarwal and Jha, 2010;Basu et al, 2016;Adams et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

“…The circadian clocks of plants anticipate environmental cues and synchronize physiological responses to occur at the most optimal time of the day. The metabolic pathways of phytohormones are under circadian regulation (Covington et al, 2008;Michael et al, 2008;Grundy et al, 2015;Singh and Mas, 2018). The transcription of genes involved in the biosynthesis of auxin, salicylic acid (SA), jasmonic acid (JA), and ethylene, as well as a large proportion of genes responsive to various abiotic stresses are rhythmically regulated (Yang et al, 2004;Covington and Harmer, 2007;Cheng et al, 2013;Wasternack and Hause, 2013;Kazan, 2015).…”

mentioning

confidence: 99%

“…PSEUDO-RESPONSE REGULATOR 5 (PRR5) and TOC1 also contribute to oscillations in SA levels by binding to the promoters of SA biosynthesis-related genes (Huang et al, 2012;Nakamichi et al, 2012;Liu et al, 2013). ABA biosynthesis and many ABAresponsive genes are under circadian control (Mizuno and Yamashino, 2008;Singh and Mas, 2018). In most species analyzed, including Arabidopsis (Lee et al, 2006), the diurnal variations of ABA content reached a peak during daytime (Grundy et al, 2015;Adams et al, 2018).…”

mentioning

confidence: 99%

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The GIGANTEA-ENHANCED EM LEVEL Complex Enhances Drought Tolerance via Regulation of Abscisic Acid Synthesis

et al. 2020

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Drought is one of the most critical environmental stresses limiting plant growth and crop productivity. The synthesis and signaling of abscisic acid (ABA), a key phytohormone in the drought stress response, is under photoperiodic control. GIGANTEA (GI), a key regulator of photoperiod-dependent flowering and the circadian rhythm, is also involved in the signaling pathways for various abiotic stresses. In this study, we isolated ENHANCED EM LEVEL (EEL)/basic Leu zipper 12, a transcription factor involved in ABA signal responses, as a GI interactor in Arabidopsis (Arabidopsis thaliana). The diurnal expression of 9-CIS-EPOXYCAROTENOID DIOXYGENASE 3 (NCED3), a rate-limiting ABA biosynthetic enzyme, was reduced in the eel, gi-1, and eel gi-1 mutants under normal growth conditions. Chromatin immunoprecipitation and electrophoretic mobility shift assays revealed that EEL and GI bind directly to the ABA-responsive element motif in the NCED3 promoter. Furthermore, the eel, gi-1, and eel gi-1 mutants were hypersensitive to drought stress due to uncontrolled water loss. The transcript of NCED3, endogenous ABA levels, and stomatal closure were all reduced in the eel, gi-1, and eel gi-1 mutants under drought stress. Our results suggest that the EEL-GI complex positively regulates diurnal ABA synthesis by affecting the expression of NCED3, and contributes to the drought tolerance of Arabidopsis.

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Environment-mediated mutagenetic interference on genetic stabilization and circadian rhythm in plants

Nidhi

Kumar

Pathania

et al. 2022

Cell. Mol. Life Sci.

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A Functional Connection between the Circadian Clock and Hormonal Timing in Arabidopsis

Cited by 28 publications

References 131 publications

Photoperiod and temperature as dominant environmental drivers triggering secondary growth resumption in Northern Hemisphere conifers

Photoperiod and temperature as dominant environmental drivers triggering secondary growth resumption in Northern Hemisphere conifers

The GIGANTEA-ENHANCED EM LEVEL Complex Enhances Drought Tolerance via Regulation of Abscisic Acid Synthesis

Environment-mediated mutagenetic interference on genetic stabilization and circadian rhythm in plants

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