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Daytime temperature is sensed by phytochrome B in Arabidopsis through a transcriptional activator HEMERA

Author

Listed:
  • Yongjian Qiu

    (University of California)

  • Meina Li

    (University of California
    Guangzhou University)

  • Ruth Jean-Ae Kim

    (University of California)

  • Carisha M. Moore

    (University of California)

  • Meng Chen

    (University of California)

Abstract

Ambient temperature sensing by phytochrome B (PHYB) in Arabidopsis is thought to operate mainly at night. Here we show that PHYB plays an equally critical role in temperature sensing during the daytime. In daytime thermosensing, PHYB signals primarily through the temperature-responsive transcriptional regulator PIF4, which requires the transcriptional activator HEMERA (HMR). HMR does not regulate PIF4 transcription, instead, it interacts directly with PIF4, to activate the thermoresponsive growth-relevant genes and promote warm-temperature-dependent PIF4 accumulation. A missense allele hmr-22, which carries a loss-of-function D516N mutation in HMR’s transcriptional activation domain, fails to induce the thermoresponsive genes and PIF4 accumulation. Both defects of hmr-22 could be rescued by expressing a HMR22 mutant protein fused with the transcriptional activation domain of VP16, suggesting a causal relationship between HMR-mediated activation of PIF4 target-genes and PIF4 accumulation. Together, this study reveals a daytime PHYB-mediated thermosensing mechanism, in which HMR acts as a necessary activator for PIF4-dependent induction of temperature-responsive genes and PIF4 accumulation.

Suggested Citation

  • Yongjian Qiu & Meina Li & Ruth Jean-Ae Kim & Carisha M. Moore & Meng Chen, 2019. "Daytime temperature is sensed by phytochrome B in Arabidopsis through a transcriptional activator HEMERA," Nature Communications, Nature, vol. 10(1), pages 1-13, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-018-08059-z
    DOI: 10.1038/s41467-018-08059-z
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    Cited by:

    1. Qing Sang & Lusheng Fan & Tianxiang Liu & Yongjian Qiu & Juan Du & Beixin Mo & Meng Chen & Xuemei Chen, 2023. "MicroRNA156 conditions auxin sensitivity to enable growth plasticity in response to environmental changes in Arabidopsis," Nature Communications, Nature, vol. 14(1), pages 1-14, December.
    2. Ruth Jean Ae Kim & De Fan & Jiangman He & Keunhwa Kim & Juan Du & Meng Chen, 2024. "Photobody formation spatially segregates two opposing phytochrome B signaling actions of PIF5 degradation and stabilization," Nature Communications, Nature, vol. 15(1), pages 1-14, December.
    3. Yogev Burko & Björn Christopher Willige & Adam Seluzicki & Ondřej Novák & Karin Ljung & Joanne Chory, 2022. "PIF7 is a master regulator of thermomorphogenesis in shade," Nature Communications, Nature, vol. 13(1), pages 1-14, December.
    4. Juan Du & Keunhwa Kim & Meng Chen, 2024. "Distinguishing individual photobodies using Oligopaints reveals thermo-sensitive and -insensitive phytochrome B condensation at distinct subnuclear locations," Nature Communications, Nature, vol. 15(1), pages 1-12, December.

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