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若林 憲一 所属 京都産業大学 生命科学部 産業生命科学科 職種 教授 |
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| 言語種別 | 英語 |
| 発行・発表の年月 | 2011/07 |
| 形態種別 | 研究論文 |
| 査読 | 査読あり |
| 標題 | Reduction-oxidation poise regulates the sign of phototaxis in Chlamydomonas reinhardtii |
| 執筆形態 | その他 |
| 掲載誌名 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA |
| 出版社・発行元 | NATL ACAD SCIENCES |
| 巻・号・頁 | 108(27),pp.11280-11284 |
| 担当区分 | 筆頭著者,責任著者 |
| 著者・共著者 | Ken-ichi Wakabayashi,Yuka Misawa,Shota Mochiji,Ritsu Kamiya |
| 概要 | In many phototrophic microorganisms and plants, chloroplasts change their positions relative to the incident light to achieve optimal photosynthesis. In the case of motile green algae, cells change their swimming direction by switching between positive and negative phototaxis, i.e., swimming toward or away from the light source, depending on environmental and internal conditions. However, little is known about the molecular signals that determine the phototactic direction. Using the green alga Chlamydomonas reinhardtii, we found that cellular reduction-oxidation (redox) poise plays a key role: Cells always exhibited positive phototaxis after treatment with reactive oxygen species (ROS) and always displayed negative phototaxis after treatment with ROS quenchers. The redox-dependent switching of the sign of phototaxis may contribute in turn to the maintenance of cellular redox homeostasis. |
| DOI | 10.1073/pnas.1100592108 |
| ISSN | 0027-8424 |
| NAID | 80021850759 |