Extended temperature optimum of photosynthetic reaction centers in Rhodobacterales
| Autor: | Karel Kopejtka, David Kaftan, H. Medová, Michal Koblížek, Vadim Selyanin |
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| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
Photosynthetic reaction centre aerobic anoxygenic phototrophs rhodobaca barguzinensis roseobacter variable fluorescence biology Phototroph Physiology Chemistry Primary charge separation 04 agricultural and veterinary sciences Plant Science Thermal management of electronic devices and systems Photosynthesis biology.organism_classification 01 natural sciences Electron transport chain lcsh:QK1-989 Rhodobacterales Membrane Chemical physics lcsh:Botany 040103 agronomy & agriculture 0401 agriculture forestry and fisheries 010606 plant biology & botany |
| Zdroj: | Photosynthetica, Vol 57, Iss 2, Pp 361-366 (2019) |
| ISSN: | 1573-9058 0300-3604 |
| DOI: | 10.32615/ps.2019.039 |
| Popis: | Temperature is one of the most important physical factors affecting microbial and biochemical processes. We investigated the performance of photosynthetic apparatus of marine photoheterotrophic bacterium Dinoroseobacter shibae under various temperatures. The primary photochemistry and electron transport was measured using variable infra-red fluorometry in the cells grown between 8-35°C. It was found that the photosynthetic electron transport had a broad temperature optimum between 25-50°C. Moreover, the primary charge separation stayed functional even after rising temperature up to 55°C. The same phenomenon was observed also in other phototrophic Rhodobacterales. The psychrotolerant bacterium Roseisalinus antarcticus reached its maximum electron transport rate at 48°C, 30°C above its growth temperature. We propose that the extended temperature stability may be crucial to maintain photosynthetic function under situation when photosynthetic membranes heat up above their ambient temperature due to the heat dissipation of the excess light energy. |
| Databáze: | OpenAIRE |
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