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101. PHOTOASSIMILATION OF GLUCOSE BY CHLORELLA IN MONOCHROMATIC LIGHT AND THE INHIBITION BY DCMU AND ANTIMYCIN A.

Author

TECHNISCHE HOCHSCHULE MUNICH (WEST GERMANY) INSTITUT FUER ANGEWANDTE BOTANIK, Kandler,O., TECHNISCHE HOCHSCHULE MUNICH (WEST GERMANY) INSTITUT FUER ANGEWANDTE BOTANIK, and Kandler,O.

Abstract

It was investigated whether monochromatic light beyond 700 millimicrons can bring about light dependent glucose uptake in the absence of O2 and CO2. The effects of DCMU and antimycin A on photoassimilation of glucose were studied. Glucose assimilation proceeds at a high rate even beyond 700 millimicrons. It is inhibited only about 30% by DCMU at a concentration where photosynthesis is completely inhibited. Antimucin A inhibits to 70% where photosynthesis is hardly effected. These results are strong evidence for the existance of cyclic photophosphorylation in vivo. (Author)

Published
1965

102. STUDIES ON THE CHANGE OF THE CONCENTRATIONS OF INTERMEDIATES DURING PHOTOSYNTHESIS OF CHLORELLA AND ISOLATED CHLOROPLASTS.

Author

TECHNISCHE HOCHSCHULE MUNICH (WEST GERMANY), Kandler,O., TECHNISCHE HOCHSCHULE MUNICH (WEST GERMANY), and Kandler,O.

Abstract

The chages in the concentrations of intermediates and the distribution of C(14) after photosynthesis in C(14)02 by Chlorella and isolated chloroplasts was measured under different conditions of photosynthesis and under the effect of metabolic inhibitors. The following results were obtained. (1) The changes in the concentrations of intermediates in Chlorella during the transition from light to dark and vice versa are independent of CO2, but dependent on anaerobiosis. (2) In Chlorella photosynthesis is inhibited even by a concentration of monoiodoacetic acid which is 100 times lower than that inhibiting respiration. The beginning of inhibition is indicated by an accumulation of labeled PGA. (3) When Chlorella is illuminated in the presence of KCN, the radioactive PGA formed during a preceding period of photosynthesis in C(14)02, is still reduced to sugar without a change in the total quantity of PGA in the cell. (4) Arsenate and DNP do not lead to an accumulation of PGA, but do inhibit the formation of RuDP. (5) The distribution of radioactivity on the paper chromatograms showed that ATP and ADP are the first labeled compounds under the two conditions. (Author)

Published
1963

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