Plant Physiol.
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Plant Physiology 57:799-801 (1976)
© 1976 American Society of Plant Biologists

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Articles

Photoreduction of Sulfur Dioxide by Spinach Leaves and Isolated Spinach Chloroplasts

John E. Silvius1, Charles H. Baer, Sherman Dodrill2 and Homer Patrick

a Departments of Biology and of Agricultural Bioichemistry, West Virginia University, Morgantown, West Virginia 26506

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.

1 Present address: Department of Agronomy, University of Illinois, Urbana, Ill. 61801.

2 Present address: Department of Biology, Bluefield State College, Bluefield, W. Va. 24701.






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ASPB Publications PLANT PHYSIOLOGY® THE PLANT CELL
Copyright © 1976 by the American Society of Plant Biologists