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Physiological and Genetic Dissection of Sucrose Inputs to the Arabidopsis thaliana Circadian System

1
Department of Plant Developmental Biology, Max-Planck Institute for Plant Breeding Research, D50829 Cologne, Germany
2
Department of Biology, University of York, York YO10 5DD, UK
3
Colegio de Postgraduados campus Campeche, Campeche CP 24450, Mexico
*
Author to whom correspondence should be addressed.
Genes 2019, 10(5), 334; https://doi.org/10.3390/genes10050334
Received: 1 March 2019 / Revised: 19 April 2019 / Accepted: 23 April 2019 / Published: 2 May 2019
(This article belongs to the Special Issue Genetic Regulation of Circadian Rhythm in Plants)
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Abstract

Circadian rhythms allow an organism to synchronize internal physiological responses to the external environment. Perception of external signals such as light and temperature are critical in the entrainment of the oscillator. However, sugar can also act as an entraining signal. In this work, we have confirmed that sucrose accelerates the circadian period, but this observed effect is dependent on the reporter gene used. This observed response was dependent on sucrose being available during free-running conditions. If sucrose was applied during entrainment, the circadian period was only temporally accelerated, if any effect was observed at all. We also found that sucrose acts to stabilize the robustness of the circadian period under red light or blue light, in addition to its previously described role in stabilizing the robustness of rhythms in the dark. Finally, we also found that CCA1 is required for both a short- and long-term response of the circadian oscillator to sucrose, while LHY acts to attenuate the effects of sucrose on circadian period. Together, this work highlights new pathways for how sucrose could be signaling to the oscillator and reveals further functional separation of CCA1 and LHY. View Full-Text
Keywords: circadian rhythm; sucrose; CCA1; LHY; pathway circadian rhythm; sucrose; CCA1; LHY; pathway
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Philippou, K.; Ronald, J.; Sánchez-Villarreal, A.; Davis, A.M.; Davis, S.J. Physiological and Genetic Dissection of Sucrose Inputs to the Arabidopsis thaliana Circadian System. Genes 2019, 10, 334.

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