Effects of aging on chlorophyll fluorescence and photosystem II electron transport in isolated chloroplasts
- 1 December 1975
- journal article
- Published by Canadian Science Publishing in Canadian Journal of Botany
- Vol. 53 (23) , 2842-2845
- https://doi.org/10.1139/b75-312
Abstract
The correlation between emission of energy and photochemical activity in isolated chloroplasts during aging was investigated. It was shown that aging hinders the intensity of chlorophyll-a fluorescence with a concomitant decrease of the photosystem II activity. In view of the parallelism between the action of exogenous fatty acids, especially C18-unsaturated acids, and the effects of aging, it is suggested that the thylakoid transformation during aging could result partly from conformational changes of the membrane polypeptides due to the presence of free fatty acids in the neighborhood of the protein molecules. It is possible that such a mechanism of fatty acid action may alter the fluorescence characteristics of chlorophyll as well as the tunneling of electrons in the photosynthetic membrane.Keywords
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