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© 1974 Oxford University Press

RESEARCH-ARTICLE

Studies on Chloroplast Degradation in vivo

III. THE EFFECT OF MAGNESIUM ON ELECTRON TRANSPORT AND PHOSPHORYLATIQN IN PLASTIDS ISOLATED FROM YOUNG AND AGEING COTYLEDONS

GÖTZ HARNISCHFEGER

Lehrstuhl für Biochemie der Pflanze 3400 Göttingen, Untere Karspüle 2

The magnesium dependence of NADP-reduction, oxygen evolution and concomitant ATP-formation was studied as a function of the age of the Cucurbita cotyledons from which the chloroplasts were isolated. Whereas NADP-reduction under alkaline assay conditions always exhibits a stimulation upon addition of Mg++, measurements in an acidic medium show an age-dependent reversal to inhibition. The data for oxygen evolution are more complex in nature, due to participation of consecutive reactions. The Mg++ concentration for optimal ATP formation decreases with the age of the cotyledonary material. The results are discussed from the viewpoint of a possible control of essential photosynthetic functions in vivo by magnesium.


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