한빛사 논문
Abstract
Hyo-Jun Lee1, Jae-Hoon Jung1, Lucas Corte´s Llorca2, Sang-Gyu Kim2, Sangmin Lee1, Ian T. Baldwin2 & Chung-Mo Park1,3
1 Department of Chemistry, Seoul National University, Seoul 151-742, Korea. 2 Department of Molecular Ecology, Max Planck Institute for Chemical Ecology, 07745 Jena, Germany. 3 Plant Genomics and Breeding Institute, Seoul National University, Seoul 151-742, Korea.
Correspondence to: Chung-Mo Park
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 PHYTOCHROMEINTERACTING 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℃, auxin content is elevated in FCA-deficient mutants that exhibit elongated stems but reduced in FCAoverexpressing 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.
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