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Superoxide is promoted by sucrose and affects amplitude of circadian rhythms in the evening

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JournalProceedings of the National Academy of Sciences of the United States of America
DateAccepted/In press - 3 Feb 2021
DatePublished (current) - 9 Mar 2021
Issue number10
Volume118
Original languageEnglish

Abstract

Plants must coordinate photosynthetic metabolism with the daily environment and adapt rhythmic physiology and development to match carbon availability. Circadian clocks drive biological rhythms which adjust to environmental cues. Products of photosynthetic metabolism, including sugars and reactive oxygen species (ROS), are closely associated with the plant circadian clock, and sugars have been shown to provide metabolic feedback to the circadian oscillator. Here, we report a comprehensive sugar-regulated transcriptome of Arabidopsis and identify genes associated with redox and ROS processes as a prominent feature of the transcriptional response. We show that sucrose increases levels of superoxide (O2–), which is required for transcriptional and growth responses to sugar. We identify circadian rhythms of O2–-regulated transcripts which are phased around dusk and find that O2– is required for sucrose to promote expression of TIMING OF CAB1 (TOC1) in the evening. Our data reveal a role for O2– as a metabolic signal affecting transcriptional control of the circadian oscillator in Arabidopsis.

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© 2021 National Academy of Sciences. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details.

    Research areas

  • circadian, superoxide, sugar, redox, ROS

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