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Titolo:
PREDICTING LIGHT ACCLIMATION IN CYANOBACTERIA FROM NONPHOTOCHEMICAL QUENCHING OF PHOTOSYSTEM-II FLUORESCENCE, WHICH REFLECTS STATE TRANSITIONS IN THESE ORGANISMS
Autore:
CAMPBELL D; OQUIST G;
Indirizzi:
MT ALLISON UNIV,DEPT BIOL SACKVILLE NB CANADA UMEA UNIV,DEPT PLANT PHYSIOL S-90187 UMEA SWEDEN
Titolo Testata:
Plant physiology
fascicolo: 4, volume: 111, anno: 1996,
pagine: 1293 - 1298
SICI:
0032-0889(1996)111:4<1293:PLAICF>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
EXCITATION-ENERGY DISTRIBUTION; RESPIRATORY ELECTRON FLOW; BLUE-GREEN-ALGAE; CHLOROPHYLL FLUORESCENCE; ANACYSTIS-NIDULANS; INORGANIC CARBON; SYNECHOCOCCUS; PHOTOSYNTHESIS; PROTEIN; OXYGEN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
40
Recensione:
Indirizzi per estratti:
Citazione:
D. Campbell e G. Oquist, "PREDICTING LIGHT ACCLIMATION IN CYANOBACTERIA FROM NONPHOTOCHEMICAL QUENCHING OF PHOTOSYSTEM-II FLUORESCENCE, WHICH REFLECTS STATE TRANSITIONS IN THESE ORGANISMS", Plant physiology, 111(4), 1996, pp. 1293-1298

Abstract

An important factor in photosynthetic ecophysiology is the light regime that a photobiont is acclimated to exploit. In a wide range of cyanobacteria and cyano-lichens, the easily measured fluorescence parameters, coefficient of nonphotochemical quenching of photosystem II variable fluorescence (q(N)) and nonphotochemical quenching, decline to a minimum near the acclimated growth light intensity. This characteristic pattern predicts the integrated light regime to which populations are acclimated, information that is particularly useful for cyanobacteria or cyano-lichens from habitats with highly variable light intensities.q(N) reflects processes that compete with photosystem II photochemistry for absorbed excitation energy. In cyanobacteria, we find no evidence for energy-dependent quenching mechanisms, which are the predominant components of q(N) in higher plants. Instead, in cyanobacteria, q(N)correlates closely with the excitation flow from the phycobilisome tophotosystem I, indicating that q(N) reflects the state transition mechanism for equilibration of excitation from the phycobilisome to the two photosystems.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 17:59:00