| Autor: |
Alfred R. Holzwarth, Matthias Rögner, Víctor Martínez-Junza, Silvia E. Braslavsky, Julia Sander, Malwina Szczepaniak |
| Rok vydání: |
2008 |
| Předmět: |
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| Zdroj: |
Photosynthesis. Energy from the Sun ISBN: 9781402067075 |
| DOI: |
10.1007/978-1-4020-6709-9_31 |
| Popis: |
Two ²-carotenes are located in the D1–D2 reaction center (RC) of photosystem II (PSII) in the X-ray structure (Loll et al. 2005). Despite the presence of these ²-carotenes and a high yield of reaction center (RC) triplet chlorophyll (Chl) production, no Chl triplet quenching by ²- carotene has been observed so far in the RC of PS II (see Telfer 2005 for a review). We have used nanosecond transient absorption spectroscopy to study the triplet kinetics and photoprotection in intact PS II cores with closed RC from T. elongatus. We report efficient photoprotection by 3Chl-to-Car quenching. We assign the 3Car to the D2 carotene, proposing a photoprotective role to the otherwise inactive branch of the RC |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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