Document Detail

Chromatic variation of the abundance of PSII complexes observed with the red alga Prophyridium cruentum.
MedLine Citation:
PMID:  11726709     Owner:  NLM     Status:  MEDLINE    
Chromatic regulation of photosystem stoichiometry in cyanophytes, green algae and probably vascular plants is achieved by regulation of the abundance of PSI in response to thylakoid electron transport state at least under our experimental conditions [cf. Fujita (1997) Photosyn. Res. 53: 83]. However, variation of not only PSI but also PSII, in reverse of each other, is characteristic of the stoichiometry regulation in red algae and some of marine cyanophytes. Our previous study with the red alga Porphyridium cruentum has revealed that PSII is inactivated by 50% upon a light shift from the light absorbed by Chl a, PSI light, to that mainly absorbed by phycobilisomes (PBS), PSII light [Fujita (1999) Plant Cell Physiol. 40: 924]. To evaluate the contribution of the photoinactivation to the chromatic variation of PSII, variation of the abundance of PSI, PSII and PBS, together with the fluorescence parameter and the activity of PSII, was followed after a light shift from PSI light to PSII light. Upon a light shift to PSII light, PSII, determined as Cyt b(559) per PBS, decreased rapidly, following the photoinactivation, down to the level a half of that before the light shift, and remained constant. Since the increase in PBS was not significant during this period, a rapid decrease of PSII/PBS led us to tentatively conclude that the degradation of PSII is a main cause for variation of the abundance of PSII. Photoinactivation of PSII, and also decrease in Cyt b(559), was accelerated, but only slightly, by the addition of chloramphenicol (CAP) at a moderate concentration while CAP at the same concentration significantly suppressed the increment of PSI determined as P700. A selective effect of CAP supports the above conclusion.
Y Fujita
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Plant & cell physiology     Volume:  42     ISSN:  0032-0781     ISO Abbreviation:  Plant Cell Physiol.     Publication Date:  2001 Nov 
Date Detail:
Created Date:  2001-11-29     Completed Date:  2002-05-23     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9430925     Medline TA:  Plant Cell Physiol     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  1239-44     Citation Subset:  IM    
Department of Marine Bioscience, Fukui Prefectural University, Obama, Fukui, 917-0003 Japan.
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MeSH Terms
Algae, Red / metabolism*,  radiation effects
Chloramphenicol / pharmacology
Chlorophyll / metabolism,  radiation effects
Cytochrome b Group / metabolism*
Cytochromes / metabolism
Cytochromes f
Light-Harvesting Protein Complexes
Photosynthetic Reaction Center Complex Proteins / metabolism*,  radiation effects
Proteins / metabolism*,  radiation effects
Reg. No./Substance:
0/Cytochrome b Group; 0/Cytochromes; 0/Light-Harvesting Protein Complexes; 0/Photosynthetic Reaction Center Complex Proteins; 0/Phycobilisomes; 0/Proteins; 1406-65-1/Chlorophyll; 479-61-8/chlorophyll a; 53321-11-2/chlorophyll P 700; 56-75-7/Chloramphenicol; 9035-46-5/Cytochromes f

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