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. 1976 Jun;57(6):939-40.
doi: 10.1104/pp.57.6.939.

Light-induced De-epoxidation in Lettuce Chloroplasts: VI. De-epoxidation in Grana and in Stoma Lamellae

D Siefermann  1 , H Y Yamamoto
Affiliations

Light-induced De-epoxidation in Lettuce Chloroplasts: VI. De-epoxidation in Grana and in Stoma Lamellae

D Siefermann et al. Plant Physiol. 1976 Jun.

Abstract

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.

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References

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    1. Plant Physiol. 1974 Sep;54(3):386-91 - PubMed
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