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Front. Plant Sci. | doi: 10.3389/fpls.2018.00247

Circadian rhythms and redox state in plants: till stress do us part

  • 1University of Wyoming, United States

A growing body of evidence demonstrates a significant relationship between cellular redox state and circadian rhythms. Each day these two vital components of plant biology influence one another, dictating the pace for metabolism and physiology. Diverse environmental stressors can disrupt this condition and, although plant scientists have made significant progress in re-constructing functional networks of plant stress responses, stress impacts on the clock-redox crosstalk is poorly understood. Inter-connected phenomena such as redox state and metabolism, internal and external environments, cellular homeostasis and rhythms can impede predictive understanding of coordinated regulation of plant stress response. The integration of circadian clock effects into predictive network models is likely to increase final yield and better predict plant responses to stress. To achieve such integrated understanding, it is necessary to consider the internal clock not only as a gatekeeper of environmental responses but also as a target of stress syndromes. Using chlorophyll fluorescence as a reliable and high-throughput probe of stress coupled to functional genomics and metabolomics will provide insights on the crosstalk across a wide range of stress severity and duration, including potential insights into oxidative stress response and signaling. We suggest the efficiency of photosystem II in light conditions (Fv’/Fm’) to be the most dynamic of the fluorescence variables and therefore the most reliable parameter to follow the stress response from early sensing to mortality.

Keywords: circadian rhythms, ROS, redox state, Plant stress response, Chlorophyll a fluorescence

Received: 05 Dec 2017; Accepted: 12 Feb 2018.

Edited by:

Lam-Son Tran, RIKEN, Japan

Reviewed by:

MOSTAFA A. ABDELRAHMAN, Tohoku University, Japan
Jin A Kim, Rural Development Administration, South Korea  

Copyright: © 2018 Guadagno, Ewers and Weinig. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Dr. Carmela Rosaria Guadagno, University of Wyoming, Laramie, United States, cguadagn@uwyo.edu