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

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 Inaba, Minami Matsui, Kentaro Ifuku, Tetsuo Kushiro, Tadao Asami and Takeshi Nakano ()
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Ryo Tachibana: Kyoto University, Kitashirakawa-Oiwake-cho
Susumu Abe: RIKEN
Momo Marugami: RIKEN
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
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

Nature Communications, 2024, vol. 15, issue 1, 1-20

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-023-44492-5

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