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FCA mediates thermal adaptation of stem growth by attenuating auxin action in Arabidopsis

Author

Listed:
  • Hyo-Jun Lee

    (Seoul National University)

  • Jae-Hoon Jung

    (Seoul National University)

  • Lucas Cortés Llorca

    (Max Planck Institute for Chemical Ecology)

  • Sang-Gyu Kim

    (Max Planck Institute for Chemical Ecology)

  • Sangmin Lee

    (Seoul National University)

  • Ian T. Baldwin

    (Max Planck Institute for Chemical Ecology)

  • Chung-Mo Park

    (Seoul National University
    Plant Genomics and Breeding Institute, Seoul National University)

Abstract

Global warming is predicted to profoundly affect plant distribution and crop yield in the near future. Higher ambient temperature can influence diverse aspects of plant growth and development. In Arabidopsis, the basic helix-loop-helix transcription factor PHYTOCHROME-INTERACTING FACTOR 4 (PIF4) regulates temperature-induced adaptive responses by modulating auxin biosynthesis. At high temperature, PIF4 directly activates expression of YUCCA8 (YUC8), a gene encoding an auxin biosynthetic enzyme, resulting in auxin accumulation. Here we demonstrate that the RNA-binding protein FCA attenuates PIF4 activity by inducing its dissociation from the YUC8 promoter at high temperature. At 28 °C, auxin content is elevated in FCA-deficient mutants that exhibit elongated stems but reduced in FCA-overexpressing plants that exhibit reduced stem growth. We propose that the FCA-mediated regulation of YUC8 expression tunes down PIF4-induced architectural changes to achieve thermal adaptation of stem growth at high ambient temperature.

Suggested Citation

  • Hyo-Jun Lee & Jae-Hoon Jung & Lucas Cortés Llorca & Sang-Gyu Kim & Sangmin Lee & Ian T. Baldwin & Chung-Mo Park, 2014. "FCA mediates thermal adaptation of stem growth by attenuating auxin action in Arabidopsis," Nature Communications, Nature, vol. 5(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms6473
    DOI: 10.1038/ncomms6473
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    Cited by:

    1. Maximilian O Press & Amy Lanctot & Christine Queitsch, 2016. "PIF4 and ELF3 Act Independently in Arabidopsis thaliana Thermoresponsive Flowering," PLOS ONE, Public Library of Science, vol. 11(8), pages 1-18, August.

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