Photoreduction of sulfur dioxide by spinach leaves and isolated spinach chloroplasts

Labeled sulfur dioxide was found to be extensively absorbed by spinach (Spinacea oleracea L.) leaves. Labeled sulfides detected in leaf blades following fumigations with sulfur dioxide in light indicated that photoreduction of sulfur dioxide had occurred. Measurable proportions of this labeled sulfu...

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Bibliographic Details
Published in:Plant physiology (Bethesda) 1976-05, Vol.57 (5), p.799-801
Main Authors: Silvius, J.E, Baer, C.H, Dodrill, S, Patrick, H
Format: Article
Language:English
Subjects:
Chloroplasts
Fumigation
Leaves
Photochemical reactions
Plants
Spinach
Sulfides
Sulfites
Sulfur
Sulfur dioxide
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Summary:Labeled sulfur dioxide was found to be extensively absorbed by spinach (Spinacea oleracea L.) leaves. Labeled sulfides detected in leaf blades following fumigations with sulfur dioxide in light indicated that photoreduction of sulfur dioxide had occurred. Measurable proportions of this labeled sulfur was localized within the chloroplast fraction. Suspensions of isolated chloroplasts supplied with labeled sulfur dioxide contained labeled sulfides following a 30-minute illumination period in water-cooled reaction vessels. With reference to recent studies of the chloroplast sulfur reduction pathway, probable points of entry for sulfur dioxide and the subsequent release of hydrogen sulfide are discussed.
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.57.5.799