TOC1-PIF4 interaction mediates the circadian gating of thermoresponsive growth in Arabidopsis

Jia Ying Zhu, Eunkyoo Oh, Tina Wang, Zhi Yong Wang

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

Arabidopsis adapts to elevated temperature by promoting stem elongation and hyponastic growth through a temperature-responsive transcription factor PIF4. Here we show that the evening-expressed clock component TOC1 interacts with and inactivates PIF4, thereby suppressing thermoresponsive growth in the evening. We find that the expression of PIF4 target genes show circadian rhythms of thermosensitivity, with minimum responsiveness in the evening when TOC1 level is high. Loss of function of TOC1 and its close homologue PRR5 restores thermosensitivity in the evening, whereas TOC1 overexpression causes thermo insensitivity, demonstrating that TOC1 mediates the evening-specific inhibition of thermoresponses. We further show that PIF4 is required for thermoadaptation mediated by moderately elevated temperature. Our results demonstrate that the interaction between TOC1 and PIF4 mediates the circadian gating of thermoresponsive growth, which may serve to increase fitness by matching thermoresponsiveness with the day-night cycles of fluctuating temperature and light conditions.

Original languageEnglish
Article number13692
JournalNature communications
Volume7
DOIs
Publication statusPublished - 2016 Dec 14
Externally publishedYes

Fingerprint

evening
Arabidopsis
Temperature
Growth
interactions
circadian rhythms
Circadian Rhythm
fitness
temperature
Clocks
Elongation
Transcription Factors
stems
Genes
night
genes
clocks
elongation
Light
cycles

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Cite this

TOC1-PIF4 interaction mediates the circadian gating of thermoresponsive growth in Arabidopsis. / Zhu, Jia Ying; Oh, Eunkyoo; Wang, Tina; Wang, Zhi Yong.

In: Nature communications, Vol. 7, 13692, 14.12.2016.

Research output: Contribution to journalArticle

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