Article (Scientific journals)
Changes in nitrogen source modify distribution of excitation energy in the cyanobacterium Phormidium laminosum
deAlda, JAGO; Tapia, M. I.; Franck, Fabrice et al.
1996In Physiologia Plantarum, 97 (1), p. 69-78
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Keywords :
fluorescence; nitrogen metabolism; Phormidium laminosum; photosynthesis; state transitions
Abstract :
[en] In an attempt to clarify the interactions between the available nitrogen source and the photosystems in cyanobacteria, O-2 exchange and fluorescence emission were monitored in spheroplasts and intact cells of the non N-2-fixing cyanobacterium Phormidium laminosum (strain OH-1-p.Cl-1) growing on different nitrogen sources or in the absence of nitrogen. Short-term (time scale of seconds to minutes), NH4+ addition to NO3--growing or N-starved cells and, to a minor extent, NO3- addition to N-starved cells, induced state 2 transitions both in light and dark. Long term (time scale of days), the fluorescence yield of PSI relative to that of PSII at 77 K was higher in NO3-- than in NH4-+ growing cells, and even higher in N-starved cells. In the dark, the plastoquinone pool was more reduced in NH4-+ than in NO3--growing cells. Both PSII and PSI activities and the degree of linking between both photosystems were affected in the long term, so that non-cyclic electron transport decreased in parallel to the ferredoxin requirement to assimilate each nitrogen source. Results indicate that nitrogen metabolism exerts short- and long-term control over the photosynthetic apparatus, which acclimates to the energy requirement of the available nitrogen source.
Disciplines :
Phytobiology (plant sciences, forestry, mycology...)
Author, co-author :
deAlda, JAGO
Tapia, M. I.
Franck, Fabrice ;  Université de Liège - ULiège > Biochimie végétale
Llama, M. J.
Serra, J. L.
Language :
English
Title :
Changes in nitrogen source modify distribution of excitation energy in the cyanobacterium Phormidium laminosum
Publication date :
1996
Journal title :
Physiologia Plantarum
ISSN :
0031-9317
eISSN :
1399-3054
Publisher :
Blackwell Publishing, Copenhagen, Denmark
Volume :
97
Issue :
1
Pages :
69-78
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 17 May 2010

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