Phototropin2 Contributes to the Chloroplast Avoidance Response at the Chloroplast-Plasma Membrane Interface
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- Ishishita, Kazuhiro
- 九州大学大学院生物資源環境科学府
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- Higa, Takeshi
- 大阪大学蛋白質研究所
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- 田中, 秀一
- 九州大学大学院生物資源環境科学府
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- 井上, 晋一郎
- 名古屋大学大学院理学研究科
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- Chung, Aeri
- 九州大学大学院生物資源環境科学府
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- 牛島, 智一
- 九州大学大学院農学研究院
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- 松下, 智直
- 九州大学大学院農学研究院
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- 木下, 俊則
- 名古屋大学大学院理学研究科
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- 中井, 正人
- 大阪大学蛋白質研究所
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- 和田, 正三
- 東京都立大学大学院理学研究科
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- 末次, 憲之
- 京都大学大学院生命科学研究科
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- 後藤, 栄治
- 九州大学大学院農学研究院
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Blue-light-induced chloroplast movements play an important role in maximizing light utilization for photosynthesis in plants. Under a weak light condition, chloroplasts accumulate to the cell surface to capture light efficiently (chloroplast accumulation response). Conversely, chloroplasts escape from strong light and move to the side wall to reduce photodamage (chloroplast avoidance response). The blue light receptor phototropin (phot) regulates these chloroplast movements and optimizes leaf photosynthesis by controlling other responses in addition to chloroplast movements. Seed plants such as Arabidopsis (Arabidopsis thaliana) have phot1 and phot2. They redundantly mediate phototropism, stomatal opening, leaf flattening, and the chloroplast accumulation response. However, the chloroplast avoidance response is induced by strong blue light and regulated primarily by phot2. Phots are localized mainly on the plasma membrane. However, a substantial amount of phot2 resides on the chloroplast outer envelope. Therefore, differentially localized phot2 might have different functions. To determine the functions of plasma membrane- and chloroplast envelope-localized phot2, we tethered it to these structures with their respective targeting signals. Plasma membrane-localized phot2 regulated phototropism, leaf flattening, stomatal opening, and chloroplast movements. Chloroplast envelope-localized phot2 failed to mediate phototropism, leaf flattening, and the chloroplast accumulation response but partially regulated the chloroplast avoidance response and stomatal opening. Based on the present and previous findings, we propose that phot2 localized at the interface between the plasma membrane and the chloroplasts is required for the chloroplast avoidance response and possibly for stomatal opening as well.
収録刊行物
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- lant Physiology
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lant Physiology 183 (1), 304-316, 2020-05
Oxford University Press
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詳細情報 詳細情報について
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- CRID
- 1050298532703812096
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- NII書誌ID
- AA00775335
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- ISSN
- 15322548
- 00320889
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- HANDLE
- 2324/4774192
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- 本文言語コード
- en
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- 資料種別
- journal article
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- データソース種別
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- IRDB