scholarly journals Relationship between the Quantum Efficiencies of Photosystems I and II in Pea Leaves

1989 ◽  
Vol 90 (3) ◽  
pp. 1029-1034 ◽  
Author(s):  
Jeremy Harbinson ◽  
Bernard Genty ◽  
Neil R. Baker
Keyword(s):  
Photosystems I And Ii

Magnetic field dependence of13C photo-CIDNP MAS NMR in plant photosystems I and II

2007 ◽  
Vol 31 (1-2) ◽  
pp. 193-204 ◽  
Author(s):  
E. Roy ◽  
A. Diller ◽  
Alia ◽  
P. Gast ◽  
H. J. van Gorkom ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Field Dependence ◽  
Magnetic Field Dependence ◽  
Mas Nmr ◽  
Photosystems I And Ii

Variety in excitation energy transfer processes from phycobilisomes to photosystems I and II

2017 ◽  
Vol 133 (1-3) ◽  
pp. 235-243 ◽  
Author(s):  
Yoshifumi Ueno ◽  
Shimpei Aikawa ◽  
Kyosuke Niwa ◽  
Tomoko Abe ◽  
Akio Murakami ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Excitation Energy ◽  
Excitation Energy Transfer ◽  
Transfer Processes ◽  
Photosystems I And Ii

Structure of the maize photosystem I supercomplex with light-harvesting complexes I and II

Science ◽  
2018 ◽  
Vol 360 (6393) ◽  
pp. 1109-1113 ◽  
Author(s):  
Xiaowei Pan ◽  
Jun Ma ◽  
Xiaodong Su ◽  
Peng Cao ◽  
Wenrui Chang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Energy Transfer ◽  
Complex I ◽  
Light Harvesting ◽  
Light Conditions ◽  
Light Harvesting Complexes ◽  
Light Harvesting Complex ◽  
Cryo Electron Microscopy ◽  
Photosystems I And Ii ◽  
Light Harvesting Complex Ii

Plants regulate photosynthetic light harvesting to maintain balanced energy flux into photosystems I and II (PSI and PSII). Under light conditions favoring PSII excitation, the PSII antenna, light-harvesting complex II (LHCII), is phosphorylated and forms a supercomplex with PSI core and the PSI antenna, light-harvesting complex I (LHCI). Both LHCI and LHCII then transfer excitation energy to the PSI core. We report the structure of maize PSI-LHCI-LHCII solved by cryo–electron microscopy, revealing the recognition site between LHCII and PSI. The PSI subunits PsaN and PsaO are observed at the PSI-LHCI interface and the PSI-LHCII interface, respectively. Each subunit relays excitation to PSI core through a pair of chlorophyll molecules, thus revealing previously unseen paths for energy transfer between the antennas and the PSI core.

scholarly journals Blue light reduces photosynthetic efficiency of cyanobacteria through an imbalance between photosystems I and II

2018 ◽  
Vol 138 (2) ◽  
pp. 177-189 ◽  
Author(s):  
Veerle M. Luimstra ◽  
J. Merijn Schuurmans ◽  
Antonie M. Verschoor ◽  
Klaas J. Hellingwerf ◽  
Jef Huisman ◽  
...  
Keyword(s):  
Blue Light ◽  
Photosynthetic Efficiency ◽  
Photosystems I And Ii

Laser-induced Chlorophyll Fluorescence Ratio in Certain Plants Exhibiting Leaf Heliotropism

1997 ◽  
Vol 24 (2) ◽  
pp. 159 ◽  
Author(s):  
M. V. Sailaja ◽  
Y. Chandrasekhar ◽  
D. Narayana Rao ◽  
V. S. Rama Das
Keyword(s):  
Chlorophyll Fluorescence ◽  
Oryza Sativa L ◽  
Ricinus Communis ◽  
Hibiscus Cannabinus ◽  
Midday Depression ◽  
Photosystems I And Ii ◽  
Solar Tracking ◽  
Cleome Gynandra ◽  
Ricinus Communis L ◽  
Use Efficiency

Laser-induced F685/F720 chlorophyll fluorescence of intact leaves in solar tracking plants from Euphorbiaceae (Ricinus communis L.), Amaranthaceae (Amaranthus gangeticus L., Amaranthus viridis L.), Malvaceae (Hibiscus cannabinus L., Althaea rosea L.), Fabaceae (Dolichos lablab L.) Capparadaceae (Cleome gynandra L.) exhibited remarkable diurnal constancy in contrast to those of compass plants from Poaceae (Oryza sativa L.) and Amaranthaceae (Telanthera ficoides Moq.) with fixed leaf orientation. The F685/F720 ratio remained constant in both the diaheliotropic and paraheliotropic plants, but it decreased during midday in compass plants. The acquired spectra were analysed in terms of Gaussian parameters to determine the relative intensity of contribution of various bands; the data suggested a decrease in both the F685 and the F720 bands at 1230 h in compass plants while they remained unaltered in reorienting leaves. The typical midday depression in F685/F720 ratio observed in compass plants may be due to down-regulation of both photosystems, I and II. This unique behaviour of diurnal constancy in laser-induced F685/F720 suggests that the leaves of diaheliotropic plants maximise light-use efficiency throughout the day and avoid the hazard of midday depression of photosynthesis.

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