Abstract
Chlorophyll fluorescence quenching was induced in the major light-harvesting complex of Photosystem II by low pH. Quenching was enhanced by the tertiary amine dibucaine and magnesium ions and inhibited by antimycin A, similar to their effects on nonphotochemical quenching in chloroplasts (Noctor et al. (1993) Biochim. Biophys. Acta 1183, 339–344). Quenching was associated with a change in aggregation state as monitored by sucrose gradient centrifugation. The xanthophyll cycle carotenoid violaxanthin strongly inhibited quenching whereas zeaxanthin has no effect on it, suggesting that the role of the xanthophyll cycle in the quenching of chlorophyll fluorescence in vivo is to control the organisation of the light harvesting system.
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Schedule a callMore From: Biochimica et Biophysica Acta (BBA) - Bioenergetics
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