4.7 Article

Circadian Redox Rhythm in Plant-Fungal Pathogen Interactions

Journal

ANTIOXIDANTS & REDOX SIGNALING
Volume 37, Issue 10-12, Pages 726-738

Publisher

MARY ANN LIEBERT, INC
DOI: 10.1089/ars.2021.0281

Keywords

circadian; transcriptional-translational feedback loop (TTFL); plant-fungus interaction; phytohormones; redox homeostasis; rice blast disease

Funding

  1. National NaturalScience Foundation of China [32022070]
  2. Key Realm R&D Program of Guangdong Province [2020B0202090001]
  3. China PostdoctoralScience Foundation [2020M682723]

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Circadian rhythm and ROS homeostasis are important factors in plant-fungus interactions, and understanding the interconnections between the circadian timekeeping machinery and ROS signaling is crucial for disease control strategies.
Significance: Circadian-controlled cellular growth, differentiation, and metabolism are mainly achieved by a classical transcriptional-translational feedback loop (TTFL), as revealed by investigations in animals, plants, and fungi.Recent Advances: Recently, reactive oxygen species (ROS) have been reported as part of a cellular network synchronizing nontranscriptional oscillators with established TTFL components, adding complexity to regulatory mechanisms of circadian rhythm. Both circadian rhythm and ROS homeostasis have a great impact on plant immunity as well as fungal pathogenicity, therefore interconnections of these two factors are implicit in plant-fungus interactions.Critical Issues: In this review, we aim to summarize the recent advances in circadian-controlled ROS homeostasis, or ROS-modulated circadian clock, in plant-fungus pathosystems, particularly using the rice (Oryza sativa) blast fungus (Magnaporthe oryzae) pathosystem as an example. Understanding of such bidirectional interaction between the circadian timekeeping machinery and ROS homeostasis/signaling would provide a theoretical basis for developing disease control strategies for important plants/crops.Future Directions: Questions remain unanswered about the detailed mechanisms underlying circadian regulation of redox homeostasis in M. oryzae, and the consequent fungal differentiation and death in a time-of-day manner. We believe that the rice-M. oryzae pathobiosystem would provide an excellent platform for investigating such issues in circadian-ROS interconnections in a plant-fungus interaction context.

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