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RCB initiates Arabidopsis thermomorphogenesis by stabilizing the thermoregulator PIF4 in the daytime

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  • Yongjian Qiu

    (University of California
    University of Mississippi)

  • Elise K. Pasoreck

    (University of California)

  • Chan Yul Yoo

    (University of California)

  • Jiangman He

    (University of California)

  • He Wang

    (University of California)

  • Abhishesh Bajracharya

    (University of Mississippi)

  • Meina Li

    (University of California)

  • Haley D. Larsen

    (University of California)

  • Stacey Cheung

    (University of California)

  • Meng Chen

    (University of California)

Abstract

Daytime warm temperature elicits thermomorphogenesis in Arabidopsis by stabilizing the central thermoregulator PHYTOCHROME INTERACTING transcription FACTOR 4 (PIF4), whose degradation is otherwise promoted by the photoreceptor and thermosensor phytochrome B. PIF4 stabilization in the light requires a transcriptional activator, HEMERA (HMR), and is abrogated when HMR’s transactivation activity is impaired in hmr-22. Here, we report the identification of a hmr-22 suppressor mutant, rcb-101, which surprisingly carries an A275V mutation in REGULATOR OF CHLOROPLAST BIOGENESIS (RCB). rcb-101/hmr-22 restores thermoresponsive PIF4 accumulation and reverts the defects of hmr-22 in chloroplast biogenesis and photomorphogenesis. Strikingly, similar to hmr, the null rcb-10 mutant impedes PIF4 accumulation and thereby loses the warm-temperature response. rcb-101 rescues hmr-22 in an allele-specific manner. Consistently, RCB interacts directly with HMR. Together, these results unveil RCB as a novel temperature signaling component that functions collaboratively with HMR to initiate thermomorphogenesis by selectively stabilizing PIF4 in the daytime.

Suggested Citation

  • Yongjian Qiu & Elise K. Pasoreck & Chan Yul Yoo & Jiangman He & He Wang & Abhishesh Bajracharya & Meina Li & Haley D. Larsen & Stacey Cheung & Meng Chen, 2021. "RCB initiates Arabidopsis thermomorphogenesis by stabilizing the thermoregulator PIF4 in the daytime," Nature Communications, Nature, vol. 12(1), pages 1-13, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-22313-x
    DOI: 10.1038/s41467-021-22313-x
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