Adaptation of light-harvesting and energy-transfer processes of a diatom Chaetoceros gracilis to different light qualities.
Photosynth Res
; 146(1-3): 87-93, 2020 Dec.
Article
em En
| MEDLINE
| ID: mdl-31970552
ABSTRACT
Diatoms are a major group of microalgae in marine and freshwater environments. To utilize the light energy in blue to green region, diatoms possess unique antenna pigment-protein complexes, fucoxanthin chlorophyll a/c-binding proteins (FCPs). Depending on light qualities and quantities, diatoms form FCPs with different energies normal-type and red-shifted FCPs. In the present study, we examined changes in light-harvesting and energy-transfer processes of a diatom Chaetoceros gracilis cells grown using white- and single-colored light-emitting diodes (LEDs), by means of time-resolved fluorescence spectroscopy. The blue LED, which is harvested by FCPs, modified energy transfer involving CP47, and suppressed energy transfer to PSI. Under the red-LED conditions, which is absorbed by both FCPs and PSs, energy transfer to PSI was enhanced, and the red-shifted FCP appeared. The red-shifted FCP was also recognized under the green- and yellow-LEDs, suggesting that lack of the shorter-wavelength light induces the red-shifted FCP. Functions of the red-shifted FCPs are discussed.
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Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Diatomáceas
/
Transferência de Energia
Idioma:
En
Ano de publicação:
2020
Tipo de documento:
Article
País de afiliação:
Japão