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Genes 2018, 9(12), 628; https://doi.org/10.3390/genes9120628

PIF-Mediated Sucrose Regulation of the Circadian Oscillator is Light Quality and Temperature Dependent

1
Department of Plant and Environmental Sciences, Institute for Life Sciences, Edmond J. Safra Campus, Givat Ram, Hebrew University, Jerusalem, 91904 Israel
2
Department of Molecular Biosciences and The Institute for Cellular and Molecular Biology, The University of Texas at Austin, Austin, TX 78712, USA
*
Author to whom correspondence should be addressed.
Received: 19 October 2018 / Revised: 26 November 2018 / Accepted: 10 December 2018 / Published: 13 December 2018
(This article belongs to the Special Issue Genetic Regulation of Circadian Rhythm in Plants)
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Abstract

Studies are increasingly showing that metabolic and circadian (~24 h) pathways are strongly interconnected, with the circadian system regulating the metabolic state of the cell, and metabolic products feeding back to entrain the oscillator. In plants, probably the most significant impact of the circadian system on metabolism is in its reciprocal regulation of photosynthesis; however, the pathways by which this occurs are still poorly understood. We have previously shown that members of the basic helix-loop-helix (bHLH) transcription factor PHYTOCHROME INTERACTING FACTOR (PIF) family are involved in the photosynthate entrainment of the circadian oscillator. In this paper, using Arabidopsis mutants and overexpression lines, we examine how temperature and light quality affect PIF-mediated sucrose signaling to the oscillator and examine the contributions of individual PIF members. Our results also show that the quality of light is important for PIF signaling, with red and blue lights having the opposite effects, and that temperature affects PIF-mediated sucrose signaling. We propose the light sensitivity of PIF-mediated sucrose entrainment of the oscillator may be important in enabling plants to distinguish between sucrose produced de novo from photosynthesis during the day and the sucrose products of starch degradation at the end of the night. View Full-Text
Keywords: circadian rhythms; sucrose signal; PIFs; red/blue ratio; temperature circadian rhythms; sucrose signal; PIFs; red/blue ratio; temperature
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Shor, E.; Potavskaya, R.; Kurtz, A.; Paik, I.; Huq, E.; Green, R. PIF-Mediated Sucrose Regulation of the Circadian Oscillator is Light Quality and Temperature Dependent. Genes 2018, 9, 628.

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