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BPG4 regulates chloroplast development and homeostasis by suppressing GLK transcription factors and involving light and brassinosteroid signaling

Author

Listed:
  • Ryo Tachibana

    (Kyoto University, Kitashirakawa-Oiwake-cho)

  • Susumu Abe

    (RIKEN
    Meiji University)

  • Momo Marugami

    (RIKEN
    Meiji University)

  • Ayumi Yamagami

    (Kyoto University, Kitashirakawa-Oiwake-cho)

  • Rino Akema

    (Kyoto University, Kitashirakawa-Oiwake-cho)

  • Takao Ohashi

    (Kyoto University, Kitashirakawa-Oiwake-cho)

  • Kaisei Nishida

    (Kyoto University, Kitashirakawa-Oiwake-cho)

  • Shohei Nosaki

    (Tsukuba University)

  • Takuya Miyakawa

    (Kyoto University, Kitashirakawa-Oiwake-cho)

  • Masaru Tanokura

    (University of Tokyo)

  • Jong-Myong Kim

    (RIKEN
    University of Tokyo
    Ac-Planta Inc.)

  • Motoaki Seki

    (RIKEN)

  • Takehito Inaba

    (University of Miyazaki)

  • Minami Matsui

    (RIKEN)

  • Kentaro Ifuku

    (Kyoto University)

  • Tetsuo Kushiro

    (Meiji University)

  • Tadao Asami

    (University of Tokyo)

  • Takeshi Nakano

    (Kyoto University, Kitashirakawa-Oiwake-cho
    RIKEN)

Abstract

Chloroplast development adapts to the environment for performing suitable photosynthesis. Brassinosteroids (BRs), plant steroid hormones, have crucial effects on not only plant growth but also chloroplast development. However, the detailed molecular mechanisms of BR signaling in chloroplast development remain unclear. Here, we identify a regulator of chloroplast development, BPG4, involved in light and BR signaling. BPG4 interacts with GOLDEN2-LIKE (GLK) transcription factors that promote the expression of photosynthesis-associated nuclear genes (PhANGs), and suppresses their activities, thereby causing a decrease in the amounts of chlorophylls and the size of light-harvesting complexes. BPG4 expression is induced by BR deficiency and light, and is regulated by the circadian rhythm. BPG4 deficiency causes increased reactive oxygen species (ROS) generation and damage to photosynthetic activity under excessive high-light conditions. Our findings suggest that BPG4 acts as a chloroplast homeostasis factor by fine-tuning the expression of PhANGs, optimizing chloroplast development, and avoiding ROS generation.

Suggested Citation

  • Ryo Tachibana & Susumu Abe & Momo Marugami & Ayumi Yamagami & Rino Akema & Takao Ohashi & Kaisei Nishida & Shohei Nosaki & Takuya Miyakawa & Masaru Tanokura & Jong-Myong Kim & Motoaki Seki & Takehito , 2024. "BPG4 regulates chloroplast development and homeostasis by suppressing GLK transcription factors and involving light and brassinosteroid signaling," Nature Communications, Nature, vol. 15(1), pages 1-20, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-023-44492-5
    DOI: 10.1038/s41467-023-44492-5
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    References listed on IDEAS

    as
    1. Yuki Kondo & Tasuku Ito & Hirofumi Nakagami & Yuki Hirakawa & Masato Saito & Takayuki Tamaki & Ken Shirasu & Hiroo Fukuda, 2014. "Plant GSK3 proteins regulate xylem cell differentiation downstream of TDIF–TDR signalling," Nature Communications, Nature, vol. 5(1), pages 1-11, May.
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