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Titolo:
CHANGES IN PHOTOSYSTEM STOICHIOMETRY IN RESPONSE TO ENVIRONMENTAL-CONDITIONS FOR CELL-GROWTH OBSERVED WITH THE CYANOPHYTE SYNECHOCYSTIS PCC-6714
Autore:
MURAKAMI A; KIM SJ; FUJITA Y;
Indirizzi:
NATL INST BASIC BIOL,DEPT CELL BIOL OKAZAKI AICHI 444 JAPAN
Titolo Testata:
Plant and Cell Physiology
fascicolo: 4, volume: 38, anno: 1997,
pagine: 392 - 397
SICI:
0032-0781(1997)38:4<392:CIPSIR>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
CYANOBACTERIAL PHOTOSYNTHETIC SYSTEM; ELECTRON-TRANSPORT COMPOSITION; ANACYSTIS-NIDULANS; CYTOCHROME-OXIDASE; REDOX STATE; LIGHT REGIME; STEADY-STATE; II LIGHT; PCC-6714; COMPLEX;
Keywords:
CYT C OXIDASE; ENVIRONMENTAL STRESS; PHOTOSYSTEM STOICHIOMETRY; SYNECHOCYSTIS PCC6714; THYLAKOIDS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
26
Recensione:
Indirizzi per estratti:
Citazione:
A. Murakami et al., "CHANGES IN PHOTOSYSTEM STOICHIOMETRY IN RESPONSE TO ENVIRONMENTAL-CONDITIONS FOR CELL-GROWTH OBSERVED WITH THE CYANOPHYTE SYNECHOCYSTIS PCC-6714", Plant and Cell Physiology, 38(4), 1997, pp. 392-397

Abstract

Changes in photosystem stoichiometry in response to shift of environments for cell growth other than light regime were studied with the cyanophyte Synechocystis PCC 6714 in relation to the change induced by light-quality shift. Following two environment-shifts were examined: theshift of molecular form of inorganic carbon source for photosynthesisfrom CO2 to HCO3- (CO2 stress) and the increase in salinity of the medium with NaCl (0.5 M) (Na+ stress). Both CO2 and Na+ stresses inducedthe increase in PSI abundance resulting in a higher PSI/PSII stoichiometry. CO2 stress was found to elevate simultaneously Cyt c oxidase activity (V-max). The feature was the same as that caused by light-quality shift from preferential excitation of PSI to PSII (light stress) though the enhancement by either stress was smaller than that by light stress. Under our experimental conditions, PSI/PSII stoichiometry appeared to increase at a fairly constant rate to the basal level even whenthe basal level had been differently determined by the light-quality. Enhancing rates for PSI/PSII stoichiometry and for Cyt c oxidase activity were also similar to each other. Since the two stresses affect the thylakoid electron transport similarly to the shift of light-quality, we interpreted our results as follows: three environmental stresses,CO2, Na+, and light stresses, cause changes in electron turnover capacity of PSI and Cyt c oxidase under a similar, probably a common, mechanism for monitoring redox state of thylakoid electron transport system.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/09/20 alle ore 12:50:16