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Plant Physiology 88:961-964 (1988)
© 1988 American Society of Plant Biologists

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Metabolism and Enzymology

Characterization of Elemental Sulfur in Isolated Intact Spinach Chloroplasts

Jacques Joyard, Eric Forest, Elizabeth Blée and Roland Douce

Laboratoire Mixte CNRS/Rhône-Poulenc, UM n° 41, Rhône-Poulenc Agrochimie, 14-20 rue Pierre Baizet, 69263 Lyon-Cédex 09, France, Départment de Chimie Appliquée et d'Etudes Analytiques, Section de Recherches et Contrôles Analytiques, Centre d'Etudes Nucléaires de Grenoble, 85 X, 38041 Grenoble-Cédex, France, Laboratoire d'Enzymologie Moléculaire et Cellulaire, UA CNRS 1182, Institut de Botanique, 28 rue Goethe, 67083 Strasbourg-Cédex, France

Incubation of intact spinach (Spinacia oleracea L.) chloroplasts in the presence of 35SO42– resulted in the light-dependent formation of a chloroform-soluble sulfur-containing compound distinct from sulfolipid. We have identified this compound as the most stable form (S8) of elemental sulfur (S0, valence state for S = O) by mass spectrometry. It is possible that elemental sulfur (S0) was formed by oxidation of bound sulfide, i.e. after the photoreduction of sulfate to sulfide by intact chloroplasts, and released as S8 under the experimental conditions used for analysis.




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Copyright © 1988 by the American Society of Plant Biologists