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rdf:type |
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lifeskim:mentions |
umls-concept:C0348080,
umls-concept:C0439148,
umls-concept:C0442805,
umls-concept:C0456205,
umls-concept:C0598079,
umls-concept:C0599132,
umls-concept:C0995552,
umls-concept:C1274040,
umls-concept:C1504318,
umls-concept:C1550605,
umls-concept:C1720901,
umls-concept:C1979891
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pubmed:issue |
3
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pubmed:dateCreated |
1994-8-4
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pubmed:abstractText |
The filamentous nitrogen-fixing cyanobacterium Anabaena variabilis ATCC 29413 is capable of heterotrophic growth in complete darkness. After 6 months of continuous dark growth, both the autotrophic and heterotrophic cultures were found to have the same doubling time of 14 h. On a cellular basis, the chlorophyll content remained the same and the phycobilin content showed an increase in the dark-grown cultures. Fluorescence emission spectra at 77 K of dark-grown cells indicated that the phycobilisomes are functionally associated with photosystem II (PSII). Moreover, upon transfer to light, the dark-grown cells readily evolved oxygen. Although photosystem I (PSI) and whole chain-mediated electron transfer rates were comparable in both types of cultures, the rate of PSII-mediated electron transfer was found to be 20% higher in dark-grown cells. The PSI to PSII ratio changed from 6:1 in autotrophic cultures to 4:1 in the dark-grown cells. These changes in the rate of PSII electron transfer and in the stoichiometry between the two photosystems under dark, heterotrophic growth conditions were brought about by a preferential increase in the number of PSII units while the number of PSI units remained unchanged. The advantages of using this organism in the selection of PSI-deficient mutants are discussed.
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pubmed:grant |
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pubmed:commentsCorrections |
http://linkedlifedata.com/resource/pubmed/commentcorrection/8022943-1458026,
http://linkedlifedata.com/resource/pubmed/commentcorrection/8022943-1618755,
http://linkedlifedata.com/resource/pubmed/commentcorrection/8022943-1658798,
http://linkedlifedata.com/resource/pubmed/commentcorrection/8022943-1717264,
http://linkedlifedata.com/resource/pubmed/commentcorrection/8022943-1900347,
http://linkedlifedata.com/resource/pubmed/commentcorrection/8022943-1902208,
http://linkedlifedata.com/resource/pubmed/commentcorrection/8022943-1904816,
http://linkedlifedata.com/resource/pubmed/commentcorrection/8022943-2108153,
http://linkedlifedata.com/resource/pubmed/commentcorrection/8022943-4629415,
http://linkedlifedata.com/resource/pubmed/commentcorrection/8022943-7934924,
http://linkedlifedata.com/resource/pubmed/commentcorrection/8022943-828021,
http://linkedlifedata.com/resource/pubmed/commentcorrection/8022943-828022,
http://linkedlifedata.com/resource/pubmed/commentcorrection/8022943-8425045
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pubmed:language |
eng
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pubmed:journal |
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pubmed:citationSubset |
IM
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pubmed:chemical |
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pubmed:status |
MEDLINE
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pubmed:month |
Nov
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pubmed:issn |
0032-0889
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pubmed:author |
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pubmed:issnType |
Print
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pubmed:volume |
103
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
971-7
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pubmed:dateRevised |
2009-11-18
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pubmed:meshHeading |
pubmed-meshheading:8022943-Anabaena,
pubmed-meshheading:8022943-Cell Division,
pubmed-meshheading:8022943-Darkness,
pubmed-meshheading:8022943-Diuron,
pubmed-meshheading:8022943-Electron Transport,
pubmed-meshheading:8022943-Kinetics,
pubmed-meshheading:8022943-Light,
pubmed-meshheading:8022943-Light-Harvesting Protein Complexes,
pubmed-meshheading:8022943-Membrane Proteins,
pubmed-meshheading:8022943-Photosynthesis,
pubmed-meshheading:8022943-Photosynthetic Reaction Center Complex Proteins,
pubmed-meshheading:8022943-Photosystem I Protein Complex,
pubmed-meshheading:8022943-Photosystem II Protein Complex,
pubmed-meshheading:8022943-Phycobilisomes,
pubmed-meshheading:8022943-Temperature
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pubmed:year |
1993
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pubmed:articleTitle |
Dark heterotrophic growth conditions result in an increase in the content of photosystem II units in the filamentous cyanobacterium Anabaena variabilis ATCC 29413.
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pubmed:affiliation |
Department of Biology, Washington University, St. Louis, Missouri 63130.
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pubmed:publicationType |
Journal Article,
Research Support, U.S. Gov't, P.H.S.
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