Regulation of excitation energy in Nannochloropsis photosystem II.
Photosynth Res
; 139(1-3): 155-161, 2019 Mar.
Article
em En
| MEDLINE
| ID: mdl-29704164
ABSTRACT
Recently, we isolated a complex consisting of photosystem II (PSII) and light-harvesting complexes (LHCs) from Nannochloropsis granulata (Umetani et al. Photosynth Res 13649-61, 2017). This complex contained stress-related protein, Lhcx, as a major component of LHC (Protein ID is Naga_100173g12.1), suggesting that non-photochemical quenching activities may be taking place in the PSII-LHC complex. In this study, we examined the energy transfer dynamics in the isolated LHCs and PSII-LHC complexes, and found substantial quenching capacity. In addition, the LHCs contained low-energy chlorophylls with fluorescence maxima at approximately 710 nm, which may enhance the quenching efficiency in the PSII-LHC. Delayed fluorescence analysis suggested that there was an approximately 50% reduction in energy trapping at the PSII reaction center in the PSII-LHC supercomplex under low-pH condition compared to neutral pH condition. Enhanced quenching may confer a survival advantage in the shallow-water habitat of Nannochloropsis.
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Bases de dados:
MEDLINE
Assunto principal:
Complexo de Proteína do Fotossistema II
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Estramenópilas
Idioma:
En
Revista:
Photosynth Res
Assunto da revista:
METABOLISMO
Ano de publicação:
2019
Tipo de documento:
Article
País de afiliação:
Japão