Blue-light-controlled photoprotection in plants at the level of the photosynthetic antenna complex LHCII
| Autor: | Ignacy Gryczynski, Zygmunt Gryczynski, Malgorzata Gospodarek, Wojciech Grudzinski, Jacek Goc, Ewa Janik, Rafal Luchowski, Monika Zubik, Wiesław I. Gruszecki |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Chlorophyll
chemistry.chemical_classification Time Factors Quenching (fluorescence) Light Physiology Chemistry Chlorophyll A Light-Harvesting Protein Complexes Plant Science Photosynthesis Single-molecule experiment Photochemistry Fluorescence Fluorescence spectroscopy Microscopy Fluorescence Spinacia oleracea Xanthophyll Photoprotection Protein Multimerization Spectroscopy Agronomy and Crop Science |
| Zdroj: | Journal of Plant Physiology. 167:69-73 |
| ISSN: | 0176-1617 |
| DOI: | 10.1016/j.jplph.2009.07.012 |
| Popis: | Plants have developed several adaptive regulatory mechanisms, operating at all the organization levels, to optimize utilization of light energy and to protect themselves against over-excitation-related damage. We report activity of a previously unknown possible regulatory mechanism that operates at the molecular level of the major photosynthetic pigment-protein complexes of plants, LHCII. This mechanism is driven exclusively by blue light, operates in the trimeric but not in the monomeric complex, and results in singlet excitation quenching leading to thermal energy dissipation. The conclusions are based on single molecule fluorescence lifetime analysis, direct measurements of thermal energy dissipation by photo-thermal spectroscopy, and on fluorescence spectroscopy. Possible molecular mechanisms involved in the blue-light-induced photoprotective effect are discussed, including xanthophyll photo-isomerization and the thermo-optic effect. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect