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Plant and Cell Physiology, 1979, Vol. 20, No. 4 775-779
© 1979

Article

Ageing of chloroplasts in vitro I. Quantitative analysis of the degradation of pigments, proteins and nucleic acids

P. K. Panigrahi and U. C. Biswal1

Department of Botany, Berhampur University Berhampur-760007, Orissa, India School of Life Sciences, Sambalpur University Orissa, India

1Request for reprints

Patterns of the degradation of various photosynthetic pigments, proteins and nucleic acids have been studied during the ageing of isolated chloroplasts in the light and dark. Ageing causes degradation of chlorophylls and carotenoids, but the rate of degradation of both pigments was faster during light than during dark ageing. Carotenoids are degraded much faster than chlorophylls both in the light and dark. The relatively greater degradation of carotenoids than chlorophylls in the dark suggests the involvement of some mechanism other than the photodestruction of carotenoids during ageing. The rate of decline for the DNA content is appreciably slower than that of RNA and chloroplast-protein, but the degradation of latter two macromolecules is less than that of the chlorophylls and carotenoids.

(Received October 30, 1978; )
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