期刊
BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS
卷 1837, 期 9, 页码 1484-1489出版社
ELSEVIER
DOI: 10.1016/j.bbabio.2014.04.009
关键词
Chlorophyll f; Energy transfer; Fluorescence; Photosynthesis
资金
- Ministry of Education of Japan [21570038, 22370017, 23370013]
- JST PRESTO
- Australian Research Council [DP12101360]
- Russian Science Foundation
- Australian Research Council Future Fellowship
- Australian Research Council
- Grants-in-Aid for Scientific Research [22370017, 23370013, 21570038] Funding Source: KAKEN
We examined energy transfer dynamics in the unique chlorophyll (Chi) f-containing cyanobacterium Halomicronema hongdechloris. The absorption band of Chl f appeared during cultivation of this organism under far-red light. The absorption maximum of Chl f in organic solvents occurs at a wavelength of approximately 40 nm longer than that of Chl a. In vivo, the cells display a new absorption band at approximately 730 nm at 298 K, which is at a significantly longer wavelength than that of Chl a. We primarily assigned this band to a long wavelength form of Chl a. The function of Chi f is currently unknown. We measured the fluorescence of cells using time-resolved fluorescence spectroscopy in the picosecond-to-nanosecond time range and found clear differences in fluorescence properties between the cells that contained Chl f and the cells that did not. After excitation, the fluorescence peaks of photosystem I and photosystem II appeared quickly but diminished immediately. A unique fluorescence peak located at 748 nm subsequently appeared in cells containing Chl f. This finding strongly suggests that the Chl f in this alga exists in photosystem I and II complexes and is located close to each molecule of Chi a. This article is part of a Special Issue entitled: Photosynthesis Research for Sustainability: Keys to Produce Clean Energy. (C) 2014 Elsevier B.V. All rights reserved.
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