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

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  • Jia-Ying Zhu

    (Carnegie Institution for Science)

  • Eunkyoo Oh

    (Carnegie Institution for Science
    Chonnam National University)

  • Tina Wang

    (Carnegie Institution for Science)

  • Zhi-Yong Wang

    (Carnegie Institution for Science)

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.

Suggested Citation

  • Jia-Ying Zhu & Eunkyoo Oh & Tina Wang & Zhi-Yong Wang, 2016. "TOC1–PIF4 interaction mediates the circadian gating of thermoresponsive growth in Arabidopsis," Nature Communications, Nature, vol. 7(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms13692
    DOI: 10.1038/ncomms13692
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    Cited by:

    1. Yuqing He & Yingjun Yu & Xiling Wang & Yumei Qin & Chen Su & Lei Wang, 2022. "Aschoff’s rule on circadian rhythms orchestrated by blue light sensor CRY2 and clock component PRR9," Nature Communications, Nature, vol. 13(1), pages 1-15, December.

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