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Titolo:
THE TEMPERATURE-DEPENDENCE OF THE REDOX STATE OF Q(A) AND SUSCEPTIBILITY OF PHOTOSYNTHESIS TO PHOTOINHIBITION
Autore:
OQUIST G; HURRY VM; HUNER NPA;
Indirizzi:
UMEA UNIV,DEPT PLANT PHYSIOL S-90187 UMEA SWEDEN UNIV WESTERN ONTARIO,DEPT PLANT SCI LONDON N6A 5B7 ONTARIO CANADA
Titolo Testata:
Plant physiology and biochemistry
fascicolo: 5, volume: 31, anno: 1993,
pagine: 683 - 691
SICI:
0981-9428(1993)31:5<683:TTOTRS>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHOTOSYSTEM-II; CHLOROPHYLL FLUORESCENCE; LEMNA-GIBBA; CHLOROPLAST-PROTEIN; ELECTRON-TRANSPORT; ANACYSTIS-NIDULANS; COLD-ACCLIMATION; WINTER RYE; SCOTS PINE; LIGHT;
Keywords:
CHLOROPHYLL FLUORESCENCE; COLD-HARDENING; PHOTOSYSTEM-II; LOW TEMPERATURE; CEREALS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
48
Recensione:
Indirizzi per estratti:
Citazione:
G. Oquist et al., "THE TEMPERATURE-DEPENDENCE OF THE REDOX STATE OF Q(A) AND SUSCEPTIBILITY OF PHOTOSYNTHESIS TO PHOTOINHIBITION", Plant physiology and biochemistry, 31(5), 1993, pp. 683-691

Abstract

The relationship between the redox state of primary, stable quinone acceptor of photosystem II (Q(A)) and the susceptibility of photosynthesis to photoinhibition at different temperatures was investigated. Non-hardened and cold-hardened seedlings of winter rye, and of winter andspring cultivars of wheat, were obtained by growth at either 20/16-degrees-C (day/night) or 5/5-degrees-C (day/night), respectively. A single, curvi-linear relationship was established between the steady-stateredox level Of Q(A) and the susceptibility of photosynthesis to short-term (8 h) photoinhibition at 5 or 25-degrees-C when spring and winter cultivars of rye and wheat, in non-hardened or cold-hardened states,were plotted together. Furthermore, irrespective of temperature (0 to25-degrees-C) or state of cold-hardiness, the susceptibility of photosynthesis to photoinhibition was controlled fully in winter rye by theredox state Of Q(A); e.g. similar susceptibilities to photoinhibitionwere obtained at 0, 5 and 25-degrees-C provided that the photon fluence rate at the different temperatures was adjusted to keep 50% of the photosystem II reaction centres in a closed state under steady-state illumination. Our results suggest that the primary reason plants becomeprone to photoinhibition at low temperatures is that the proportion of closed reaction centres increases due to the low temperature imposedconstraints on photosynthesis. Thus, we propose that low temperature sensitized photoinhibition results from low temperature inhibition of photosynthesis rather than from low temperature inhibition of the photosystem II repair cycle.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 12:56:24