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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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| 発行・発表の年月 | 2021/07 |
| 形態種別 | 研究論文 |
| 査読 | 査読あり |
| 標題 | Characterization of Chlamydomonas reinhardtii Mutants That Exhibit Strong Positive Phototaxis |
| 執筆形態 | その他 |
| 掲載誌名 | Plants |
| 出版社・発行元 | MDPI AG |
| 巻・号・頁 | 10(7),1483-1483頁 |
| 担当区分 | 責任著者 |
| 著者・共著者 | Jun Morishita,Ryutaro Tokutsu,Jun Minagawa,Toru Hisabori,Ken-ichi Wakabayashi |
| 概要 | The most motile phototrophic organisms exhibit photo-induced behavioral responses (photobehavior) to inhabit better light conditions for photosynthesis. The unicellular green alga Chlamydomonas reinhardtii is an excellent model organism to study photobehavior. Several years ago, we found that C. reinhardtii cells reverse their phototactic signs (i.e., positive and negative phototaxis) depending on the amount of reactive oxygen species (ROS) accumulated in the cell. However, its molecular mechanism is unclear. In this study, we isolated seven mutants showing positive phototaxis, even after the induction of negative phototaxis (ap1~7: always positive) to understand the ROS-dependent regulatory mechanism for the phototactic sign. We found no common feature in the mutants regarding their growth, high-light tolerance, and photosynthetic phenotypes. Interestingly, five of them grew faster than the wild type. These data suggest that the ROS-dependent regulation of the phototactic sign is not a single pathway and is affected by various cellular factors. Additionally, the isolation and analyses of mutants with defects in phototactic-sign regulation may provide clues for their application to the efficient cultivation of algae. |
| DOI | 10.3390/plants10071483 |
| ISSN | /2223-7747 |
| PermalinkURL | https://www.mdpi.com/2223-7747/10/7/1483/pdf |