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

Cited 42 time in Web of Science Cited 46 time in Scopus
Authors
Lee, Hyo-Jun; Jung, Jae-Hoon; Llorca, Lucas Cortes; Kim, Sang-Gyu; Lee, Sangmin; Baldwin, Ian T.; Park, Chung-Mo
Issue Date
2014-11
Citation
Nature Communications, Vol.5
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 degrees 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.
ISSN
2041-1723
URI
https://hdl.handle.net/10371/172043
DOI
https://doi.org/10.1038/ncomms6473
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College of Natural Sciences (자연과학대학)Dept. of Chemistry (화학부)Journal Papers (저널논문_화학부)
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