Abstract：
:Living organisms have to adjust to their surrounding in order to survive in stressful conditions. We study this mechanism in one of most primitive creatures - photosynthetic green sulfur bacteria. These bacteria absorb photons very efficiently using the chlorosome antenna complexes and perform photosynthesis in extreme low-light environments. How the chlorosomes in green sulfur bacteria are acclimated to the stressful light conditions, for instance, if the spectrum of light is not optimal for absorption, is unknown. Studying Chlorobaculum tepidum cultures with far-red to near-infrared light-emitting diodes, we found that these bacteria react to changes in energy flow by regulating the amount of light-absorbing pigments and the size of the chlorosomes. Surprisingly, our results indicate that the bacteria can survive in near-infrared lights capturing low-frequency photons by the intermediate units of the light-harvesting complex. The latter strategy may be used by the species recently found near hydrothermal vents in the Pacific Ocean.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Saikin SK,Khin Y,Huh J,Hannout M,Wang Y,Zare F,Aspuru-Guzik A,Tang JKdoi
10.1038/srep05057subject
Has Abstractpub_date
2014-05-27 00:00:00pages
5057issn
2045-2322pii
srep05057journal_volume
4pub_type
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