Abstract
A microscope for imaging of chlorophyll fluorescence kinetics was equipped with a chamber that allows the growth of an immobilised population of algae and their study under well-defined conditions. Single cells of the chlorococcal alga Scenedesmus quadricauda were grown and recorded for periods of whole cell cycles (up to 48 h) displaying a normal course of cell development. Heterogeneity in fluorescence yield among individual coenobia in the population and among different cells in one coenobium were analysed. Differences were observed both in the shape of Kautsky transients and in the modulation of fluorescence parameter values during the progress of the cell cycle. The extent of heterogeneity in fluorescence parameters was cell cycle dependent – in some phases of the cycle, the population was almost homogeneous, while distinct heterogeneity was observed, in particular between the protoplast division and the release of the daughter coenobia. The heterogeneity was not random but reflected developmental processes.
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Abbreviations
- AI:
-
actinic irradiance
- CC:
-
cell cycle
- Fm and \( F_{\rm m}^{\,\prime} \):
-
maximum fluorescence yield in the dark adapted state and in the light adapted state, respectively
- F0 and \( F_{0}^{\,\prime} \):
-
minimum fluorescence yield in the dark adapted and the light adapted state, respectively
- ΦP:
-
effective quantum yield of PS II photochemistry in the light adapted state
- ΦPS II:
-
effective quantum yield of photochemical energy conversion in Photosystem II
- Fq:
-
difference between the maximal and actual fluorescence in the light adapted state, often labelled ΔF
- F t :
-
actual fluorescence at time t
- Fv and \( F_{\rm v}^{\,\prime} \):
-
the yield of variable fluorescence in the dark adapted and the light adapted state, respectively
- FY:
-
fluorescence yield
- MGC:
-
measuring growth chamber
- NPQ:
-
non- photochemical quenching, used in the text as a non-specific name of the phenomenon
- PS I:
-
Photosystem I
- PS II:
-
Photosystem II
- q NP :
-
non-photochemical quenching, calculated quantity, normalised to Fm
- q P :
-
fraction of the PS II RCs actually open in the light adapted state
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Šetlíková, E., Šetlík, I., Küpper, H. et al. The photosynthesis of individual algal cells during the cell cycle of Scenedesmus quadricauda studied by chlorophyll fluorescence kinetic microscopy. Photosynth Res 84, 113–120 (2005). https://doi.org/10.1007/s11120-005-0479-6
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DOI: https://doi.org/10.1007/s11120-005-0479-6