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- W1538321419 startingPage "1209" @default.
- W1538321419 abstract "Photochemical activity, measured as energy storage of photosystems I (PSI) and II (PSII) together and individually, is studied in sugar maple (Acer saccharum Marsh.) leaves in the spectral range between 400 and 700 nm in state 1 and state 2. Total photochemical activity remains the same in both state 1 and state 2 between 580 and 700 nm, but it is lower in state 2 between 400 and 580 nm. Both PSI and PSII activities change significantly during the state transition due to the migration of light-harvesting chlorophyll a/b protein complex of PSII (LHCII). In the action spectra of PSI and PSII, peak positions vary depending on the association or dissociation of LHCII, except for the peak at 470 nm in the PSII spectrum. PSII activity is about 3 times higher than or equal to PSI in state 1 or state 2, respectively, over most of the spectrum except in the blue and far-red regions. At 470 nm, PSII activity is 8 or 1.6 times higher than PSI in state 1 or state 2, respectively. The amplitude of LHCII coupling-induced change is the same in both PSI and PSII between 580 and 700 nm, but it is less in PSI than in PSII between 400 and 580 nm, which explains the lower photochemical activity of the leaf in state 2 than in state 1. This may be due to a decrease in energy transfer efficiency of carotenoids to chlorophylls in LHCII when it is associated with PSI." @default.
- W1538321419 created "2016-06-24" @default.
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- W1538321419 date "1994-04-01" @default.
- W1538321419 modified "2023-10-18" @default.
- W1538321419 title "Action Spectra of Photosystems I and II in State 1 and State 2 in Intact Sugar Maple Leaves" @default.
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- W1538321419 doi "https://doi.org/10.1104/pp.104.4.1209" @default.
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