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Titolo:
FORMATION OF LONG-WAVELENGTH CHLOROPHYLLIDE (CHLIDE695) IS REQUIRED FOR THE ASSEMBLY OF PHOTOSYSTEM-II IN ETIOLATED BARLEY LEAVES
Autore:
FRANCK F; EULLAFFROY P; POPOVIC R;
Indirizzi:
UNIV QUEBEC,DEPT CHEM,SUCCURSALE CTR VILLE MONTREAL PQ H3C 3P8 CANADA UNIV QUEBEC,DEPT CHEM MONTREAL PQ H3C 3P8 CANADA UNIV LIEGE,LAB PHOTOBIOL,DEPT BOT B22 B-4000 LIEGE BELGIUM
Titolo Testata:
Photosynthesis research
fascicolo: 2, volume: 51, anno: 1997,
pagine: 107 - 118
SICI:
0166-8595(1997)51:2<107:FOLC(I>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
PROLAMELLAR BODIES; A-APOPROTEINS; LIGHT; PROTOCHLOROPHYLLIDE; ETIOPLASTS; PROTHYLAKOIDS; ACCUMULATION; CHLOROPLASTS; SYNTHETASE; APPEARANCE;
Keywords:
CHLOROPHYLLIDE; ETIOPLASTS; FLUORESCENCE SPECTROSCOPY; PHOTOSYSTEM II ASSEMBLY; PROTOCHLOROPHYLLIDE; VARIABLE FLUORESCENCE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
36
Recensione:
Indirizzi per estratti:
Citazione:
F. Franck et al., "FORMATION OF LONG-WAVELENGTH CHLOROPHYLLIDE (CHLIDE695) IS REQUIRED FOR THE ASSEMBLY OF PHOTOSYSTEM-II IN ETIOLATED BARLEY LEAVES", Photosynthesis research, 51(2), 1997, pp. 107-118

Abstract

Chlorophyll(ide) spectroscopic properties and Photosystem II assembly, monitored by 77 K variable fluorescence, were studied in etiolated barley leaves as a function of the extent of protochlorophyllide photoreduction by a single millisecond light flash of different intensities. Variable fluorescence, measured 2 hours after the flash, was only detected when the extent of phototransformation was higher than a threshold value of 0.4. Its development paralleled the formation of a chlorophyll emission component at 685 nm, which itself derived from long-wavelength chlorophyllide with an emission maximum at 695 nm. At low flashintensities, short-wavelength chlorophyllide forms preferentially accumulated and no Photosystem II fluorescence was detected after 2 hours. Chlorophyllide esterification was independent of the extent of phototransformation. These results suggested that the formation of long-wavelength chlorophyllide was essential for further assembly of Photosystem II. This interpretation was strengthened by the observed inhibitionof both long-wavelength chlorophyllide formation and of variable fluorescence development in leaves treated with 6-aminolevulinic acid or in untreated leaves subjected to repeated flashes of low intensity.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/09/20 alle ore 13:13:55