ISSN:
1432-072X
Keywords:
Cell cycle
;
Photosynthetic activity
;
Electron transport of photosystems
;
Fluorescence
;
Cytochrome-f photooxidation
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Activity of the photosynthetic apparatus of synchronized cultures was studied with the xanthophycean alga Bumilleriopsis filiformis, following the kinetics of fluorescence induction and photooxidation of cytochrome f (= cytochrome c-553) of intact cells. During the beginning of the cell-division phase, minimum cellular photosynthetic activity is observed and a maximum after its completion, which is accompanied by corresponding changes in Hill reaction activity and re-reduction of cytochrome f by photosystem II light. At minimum activity, the level of steady state fluorescence was higher than at the maximum. This is due, at least in part, to the diminished electron flow between the two photosystems seemingly caused by decreased photosystem I activity. This explanation was suported by the kinetics of cytochrome-f photooxidation. Thus, electron transport activity of both photosystems appears to vary during the cell cycle.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00429326
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