| Enhancement of photosynthetic O2 evolution in Chlorella vulgaris under high light and increased CO2 concentration as a sign of acclimation to phosphate deficiency. | |
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MedLine Citation:
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PMID: 15191743 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The photosynthetic oxygen evolution of Chlorella vulgaris (Beijer.) cells taken from phosphate-deficient (-P) and control cultures was measured during 8 days of culture growth. Under inorganic carbon concentration (50 microM) in the measuring cell suspension and irradiance (150 micromol m(-2) s(-1)), the same as during culture growth, there were no marked differences in the photosynthetic O2 evolution rate between the -P cells and the controls. The much slower growth of -P cultures indicated that the utilization of absorbed photosynthetically active radiation (PAR) in the CO2 assimilation and biomass production were in -P cells less efficient than in the controls. Alga cells under the phosphorus stress utilized more of the absorbed PAR in the nitrate reduction than the control cells. However, under conditions of more efficient CO2 supply (inorganic carbon concentration 150 microM, introducing of exogenous carbonic anhydrase to the measuring cell suspension) and under increased irradiance (500 micromol m(-2) s(-1)), the photosynthetic O2 evolution in -P cells reached a higher rate than in the controls. The results suggest that in -P cells the restricted CO2 availability limits the total photosynthetic process. But under conditions more favorable for the CO2 uptake and under high irradiance, the -P cells may reveal a higher photosynthetic oxygen evolution rate than the controls. It is concluded that an increased potential activity of the photosynthetic light energy absorption and conversion in the C. vulgaris cells from -P cultures is a sign of acclimation to phosphorus stress by a sun-type like adaptation response of the photosynthetic apparatus. |
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Authors:
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Bozena Kozłowska-Szerenos; Izabela Bialuk; Stanisław Maleszewski |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Plant physiology and biochemistry : PPB / Société française de physiologie végétale Volume: 42 ISSN: 0981-9428 ISO Abbreviation: Plant Physiol. Biochem. Publication Date: 2004 May |
Date Detail:
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Created Date: 2004-06-11 Completed Date: 2004-08-26 Revised Date: 2005-11-17 |
Medline Journal Info:
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Nlm Unique ID: 9882449 Medline TA: Plant Physiol Biochem Country: France |
Other Details:
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Languages: eng Pagination: 403-9 Citation Subset: IM |
Copyright Information:
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Copyright 2004 Elsevier SAS |
Affiliation:
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Institute of Biology, The University of Białystok, Swierkowa 20B, 15-950 Białystok, Poland. bokoz@uwb.edu.pl |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Carbonic Anhydrases
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chemistry,
metabolism Chlorella / metabolism* Kinetics Nitrate Reductase Nitrate Reductases / chemistry, metabolism Nitrates / metabolism Oxygen / metabolism* Phosphates / metabolism* Phosphorus / metabolism Photosynthesis* Quaternary Ammonium Compounds / chemistry Temperature Time Factors |
| Chemical | |
Reg. No./Substance:
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0/Nitrates; 0/Phosphates; 0/Quaternary Ammonium Compounds; 7723-14-0/Phosphorus; 7782-44-7/Oxygen; EC 1.7.-/Nitrate Reductases; EC 1.7.99.4/Nitrate Reductase; EC 4.2.1.1/Carbonic Anhydrases |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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