Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 57:939-940 (1976)
© 1976 American Society of Plant Biologists

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Articles

Light-induced De-epoxidation in Lettuce Chloroplasts

VI. De-epoxidation in Grana and in Stoma Lamellae 1,2

Dorothea Siefermann and Harry Y. Yamamoto

a Department of Food Science and Technology, University of Hawaii, Honolulu, Hawaii 96822

Grana and stroma lamellae fractions prepared from illuminated chloroplasts (Lactuca sativa L. var. Manoa) by French press treatment contained less violaxanthin and more zeaxanthin than the corresponding fractions from dark controls. In both fractions, only part of the total violaxanthin was de-epoxidized under illumination, and the ratio of de-epoxidized and unchanged violaxanthin was similar. This not only shows that the de-epoxidation system is present in both grana and stroma thylakoids but also that violaxanthin is heterogeneous in both membranes. The presence and similarity of the de-epoxidation system in grana and stroma lamellae suggest that the function of the violaxanthin cycle is linked to photosynthetic activities which are common to both types of membranes.

1 This work was supported in part by National Science Foundation Grant BS72-01820 (H.Y.Y.) and by a Research Fellowship (D. S.) from Deutsche Forschungsgemeinschaft. The preceding paper of this series, "Light-induced De-epoxidation of Violaxanthin in Lettuce Chloroplasts. V. Dehydroascorbate, a Link between Photosynthetic Electron Transport and De-epoxidation" by D. Siefermann and H. Y. Yamamoto appeared in the Proceedings of the Third International Congress on Photosynthesis Research, Rehovot, 1974.

2 Journal Series Publication No. 1849 of the Hawaii Agricultural Experiment Station.






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