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Chlorophyll b degradation by chlorophyll b reductase under high-light conditions

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タイトル: Chlorophyll b degradation by chlorophyll b reductase under high-light conditions
著者: Sato, Rei 著作を一覧する
Ito, Hisashi 著作を一覧する
Tanaka, Ayumi 著作を一覧する
キーワード: Chlorophyll b reductase
Light-harvesting complex
High-light conditions
発行日: 2015年 4月21日
出版者: Springer
誌名: Photosynthesis research
巻: 126
号: 2
開始ページ: 249
終了ページ: 259
出版社 DOI: 10.1007/s11120-015-0145-6
抄録: The light-harvesting chlorophyll a/b binding protein complex of photosystem II (LHCII) is the main antenna complex of photosystem II (PSII). Plants change their LHCII content depending on the light environment. Under high-light conditions, the content of LHCII should decrease because over-excitation damages the photosystem. Chlorophyll b is indispensable for accumulating LHCII, and chlorophyll b degradation induces LHCII degradation. Chlorophyll b degradation is initiated by chlorophyll b reductase (CBR). In land plants, NON-YELLOW COLORING 1 (NYC1) and NYC1-Like (NOL) are isozymes of CBR. We analyzed these mutants to determine their functions under high-light conditions. During high-light treatment, the chlorophyll a/b ratio was stable in the wild-type (WT) and nol plants, and the LHCII content decreased in WT plants. The chlorophyll a/b ratio decreased in the nyc1 and nyc1/nol plants, and a substantial degree of LHCII was retained in nyc1/nol plants after the high-light treatment. These results demonstrate that NYC1 degrades the chlorophyll b on LHCII under high-light conditions, thus decreasing the LHCII content. After the high-light treatment, the maximum quantum efficiency of the PSII photochemistry was lower in nyc1 and nyc1/nol plants than in WT and nol plants. A larger light-harvesting system would damage PSII in nyc1 and nyc1/nol plants. The fluorescence spectroscopy of the leaves indicated that photosystem I was also damaged by the excess LHCII in nyc1/nol plants. These observations suggest that chlorophyll b degradation by NYC1 is the initial reaction for the optimization of the light-harvesting capacity under high-light conditions.
Rights: The final publication is available at Springer via​1007/​s11120-015-0145-6
資料タイプ: article (author version)
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 伊藤 寿


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