Abstract :
[en] The effect of high light intensity on the metabolism of Chlorella was studied. During the induction phase of the bleaching, photosynthesis is strongly inhibited, the endogenous respiration is increased, and the oxidative assimilation decreased. As shown by determining the level of inorganic phosphate within the cell, the phosphorylation rate is decreased very strongly. These effects are similar to those reported for the X-ray and u.v. radiations. It is therefore assumed that all types of radiations have the same primary action on metabolism, probably by forming radicals and subsequently peroxides. The bleaching of the green cells is a secondary effect, which takes place only if the stabilising chloroplast structure is partly destroyed as a result of the inhibition of metabolism.
Funding text :
One of the authors is greatly indebted to the "Institut pour l'Encouragement de la Recherche Scientifique appliquée à l'Industrie et à l'Agriculture", IRSIA, Belgium, for financial support. We are also indebted to the "Deutsche Forschungsgemeinschaft" for supplying equipment.
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