Oxidation versus reductive detoxification of SO2 by chloroplasts

Oxidation versus reductive detoxification of SO2 by chloroplasts

Intact chloroplasts isolated from spinach (Spinacia oleracea L. cv Yates) both oxidized and reduced added sulfite in the light. Oxidation was fast only when endogenous superoxide dismutase was inhibited by cyanide. It was largely suppressed by scavengers of oxygen radicals. After addition of O-acety...

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Veröffentlicht in:Plant physiology (Bethesda) 1990-03, Vol.92 (3), p.846-849
Hauptverfasser: Ghisi, R. (University of Basilicata, Potenza, Italy), Dittrich, A.P.M, Heber, U
Format: Artikel
Sprache:eng
Schlagworte:
ACTIVIDAD ENZIMATICA
ACTIVITE ENZYMATIQUE
Biological and medical sciences
BIOSINTESIS
BIOSYNTHESE
Chloroplasts
CIANUROS
CISTEINA
Communications
CONTAMINACION DEL AIRE
CYANURE
CYSTEINE
DIOXIDO DE AZUFRE
DIOXYDE DE SOUFRE
Environmental and Stress Physiology
FITOTOXICIDAD
Fundamental and applied biological sciences. Psychology
INHIBIDORES DE ENZIMAS
INHIBITEUR D'ENZYME
LUMIERE
LUZ
Metabolism
Metabolism. Physicochemical requirements
OXIDACION
Oxidation
OXYDATION
Oxygen
Phosphates
PHYTOTOXICITE
Plant physiology and development
Plants
PLASTE
PLASTIDIOS
POLLUTION ATMOSPHERIQUE
REDUCCION
REDUCTION
Spinach
SPINACIA OLERACEA
Sulfates
Sulfites
Sulfur
Superoxides
SUPEROXIDO DISMUTASA
SUPEROXYDE DISMUTASE
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Zusammenfassung:Intact chloroplasts isolated from spinach (Spinacia oleracea L. cv Yates) both oxidized and reduced added sulfite in the light. Oxidation was fast only when endogenous superoxide dismutase was inhibited by cyanide. It was largely suppressed by scavengers of oxygen radicals. After addition of O-acetylserine, chloroplasts reduced sulfite to cysteine and exhibited sulfite-dependent oxygen evolution. Cysteine synthesis from sulfite was faster than from sulfate. The results are discussed in relation to species-specific differences in the phytotoxicity of SO2
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.92.3.846