Regulation of excitation energy in Nannochloropsis photosystem II

Recently, we isolated a complex consisting of photosystem II (PSII) and light-harvesting complexes (LHCs) from Nannochloropsis granulata (Umetani et al. Photosynth Res 136:49–61, 2017). This complex contained stress-related protein, Lhcx, as a major component of LHC (Protein ID is Naga_100173g12.1),...

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Bibliographic Details
Published in:Photosynthesis research 2019-03, Vol.139 (1-3), p.155-161
Main Authors: Yokono, Makio, Umetani, Ikumi, Takabayashi, Atushi, Akimoto, Seiji, Tanaka, Ayumi
Format: Article
Language:English
Subjects:
Analysis
Biochemistry
Biomedical and Life Sciences
Energy law
Fluorescence
Life Sciences
Nannochloropsis
Original Article
pH effects
Photosynthesis
Photosystem II
Plant Genetics and Genomics
Plant Physiology
Plant Sciences
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Summary:Recently, we isolated a complex consisting of photosystem II (PSII) and light-harvesting complexes (LHCs) from Nannochloropsis granulata (Umetani et al. Photosynth Res 136:49–61, 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 .
ISSN:0166-8595
1573-5079
DOI:10.1007/s11120-018-0510-3