Distribution of excitation energy in photosynthesis: quantification of fluorescence yields from intact cyanobacteria
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Cited by (32)
State transitions in cyanobacteria studied with picosecond fluorescence at room temperature
2020, Biochimica et Biophysica Acta - BioenergeticsCitation Excerpt :A decrease of the absorption cross-section/functional antenna size of PSII in state II was ascribed earlier to migration of PBSs from PSII to PSI in the mobile antenna model [15–18]. The spillover model [20,50–52] on the other hand, ascribed quenching of PSII in state II to EET to PSI, whereas also a combination of both models was proposed [20,25]. All these models predict an increase of EET to PSI in state II at the expense of excitations in PSII.
State transitions in the cyanobacterium Synechococcus elongatus 7942 involve reversible quenching of the photosystem II core
2018, Biochimica et Biophysica Acta - BioenergeticsCitation Excerpt :In [8,28,29] 77 K steady-state spectra of Synechocystis PCC 6803 and Synechococcus 7002 (normalized either to PSI emission, PBS emission, or an internal fluorescent probe) showed that the ratio of PBS/PSI emission remained the same in state I and II, which is in agreement with our results (see Fig. 1). However, in [5,30] the 77 K spectra of Synechococcus PCC 7002 and Synechococcus PCC 6301 cells showed an increase of PSI emission in state II upon PBS or Chl a excitation. This is in disagreement with the results of [8,28,29] and our results that showed the PBS/PSI emission ratio does not differ in state I and II.
Diverse mechanisms for photoprotection in photosynthesis. Dynamic regulation of photosystem II excitation in response to rapid environmental change
2015, Biochimica et Biophysica Acta - BioenergeticsCitation Excerpt :In support of the role of PBS mobility in state transitions, the presence of high concentrations of phosphate, sucrose, glutaraldehyde, or betaine has been shown to lock-in the preexisting light state and inhibit PBS movement [229,231–233,243]. Mobile PBS finely explains the redistribution of phycobilin absorbed excitation energy during state transitions, yet it is unable to explain the changes in Chl absorbed excitation energy, thereby the necessity for inclusion of the spillover mechanism [235,244–247]. Both mobile PBS and spillover mechanisms are now believed to contribute to state transitions [160,161,187,229,235,248], with a greater magnitude of energy redistribution likely from mobile PBS under natural light conditions, since spillover might only occur during dark adaption [229].
Astaxanthin production by a highly photosensitive Haematococcus mutant
2012, Process BiochemistryCitation Excerpt :After heterotrophically precultured Haematococcus cells were cultivated under autotrophic conditions for 4 days, the vegetative cells were dark-adapted at 23 °C (optimal growth temperature) for 30 min and used for the next step. Chlorophyll fluorescence in Haematococcus cells was measured at 77 K using a FluoroMax-2 spectrofluorimeter (ISA Jobin Yvon-Spex, Edison, NJ, USA) as previously described [13]. All values were corrected by subtracting the background signal from a blank medium and were normalized to a 685 nm centered PSII peak.
Changes in cyclic and respiratory electron transport by the movement of phycobilisomes in the cyanobacterium Synechocystis sp. strain PCC 6803
2007, Biochimica et Biophysica Acta - BioenergeticsCitation Excerpt :The major models are the “mobile PBS” model, which involves physical movement of PBS to explain the energy transfer from PBS to PSI [33–35], and the “spillover” model to interpret energy exchange from PSII to PSI, assuming a closer approximation of the two photosystems [36–38]. Others are similar to the two basic models [39–41]. A previous study showed that “mobile PBS” and “spillover” exist simultaneously during light-induced state transitions in cyanobacteria [41].
Light-induced excitation energy redistribution in Spirulina platensis cells: "spillover" or "mobile PBSs"?
2004, Biochimica et Biophysica Acta - BioenergeticsCitation Excerpt :The “mobile phycobilisome (PBS)” model was proposed by suggesting a physical movement of PBSs, quite analogous to that of Chl a/b-containing organisms [14–16]. Besides, there are also some other models proposed to explain the experimental observations [8,17] but similar to the two basic models mentioned above. In fact, investigation on the state transition is not only for learning the energy regulation mechanism but also for probing the structural matches and functional associations of the three functional groups, PBS, PSII and PSI.
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