| Title: | Reversible down-regulation of photosystems I and II leads to fast photosynthesis recovery after long-term drought in Jatropha curcas |
| Authors: | Sapeta, Helena Browse this author |
| Yokono, Makio Browse this author |
| Takabayashi, Atsushi Browse this author |
| Ueno, Yoshifumi Browse this author |
| Cordeiro, Andre M. Browse this author |
| Hara, Toshihiko Browse this author |
| Tanaka, Ayumi Browse this author |
| Akimoto, Seiji Browse this author |
| Oliveira, M. Margarida Browse this author |
| Tanaka, Ryouichi Browse this author →KAKEN DB |
| Keywords: | Drought |
| photoprotection |
| photosynthesis |
| photosystem I and II |
| thylakoid membrane |
| zeaxanthin |
| Issue Date: | 21-Oct-2022 |
| Publisher: | Oxford University Press |
| Journal Title: | Journal of Experimental Botany |
| Volume: | 74 |
| Issue: | 1 |
| Start Page: | 336 |
| End Page: | 351 |
| Publisher DOI: | 10.1093/jxb/erac423 |
| Abstract: | Jatropha curcas is a drought-tolerant plant that maintains its photosynthetic pigments under prolonged drought, and quickly regains its photosynthetic capacity when water is available. It has been reported that drought stress leads to increased thermal dissipation in PSII, but that of PSI has been barely investigated, perhaps due to technical limitations in measuring the PSI absolute quantum yield. In this study, we combined biochemical analysis and spectroscopic measurements using an integrating sphere, and verified that the quantum yields of both photosystems are temporarily down-regulated under drought. We found that the decrease in the quantum yield of PSII was accompanied by a decrease in the core complexes of PSII while light-harvesting complexes are maintained under drought. In addition, in drought-treated plants, we observed a decrease in the absolute quantum yield of PSI as compared with the well-watered control, while the amount of PSI did not change, indicating that non-photochemical quenching occurs in PSI. The down-regulation of both photosystems was quickly lifted in a few days upon re-watering. Our results indicate, that in J. curcas under drought, the down-regulation of both PSII and PSI quantum yield protects the photosynthetic machinery from uncontrolled photodamage. |
| Rights: | This is a pre-copyedited, author-produced version of an article accepted for publication in Journal of Experimental Botany following peer review. The version of record is available online at: https://doi.org/10.1093/jxb/erac423 |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/90584 |
| Appears in Collections: | 低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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