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Plant and Cell Physiology, 1990, Vol. 31, No. 4 419-422
© 1990

Article

Influence of Calcium on Formation and Reduction of Protochlorophyllide in the Pigment Mutant C-2A' of Scenedesmus obliquus

Kiriakos Kotzabasis1, Shigetoh Miyachi2 and Horst Senger1

1Fachbereich Biologie/Botanik, der Philipps Universität Marburg Lahnberge, 3550 Marburg, F.R.G.
2Institute of Applied Microbiology, University of Tokyo Bunkyo-Ku, Tokyo, JAPAN

The levels of protochlorophyllide and protochlorophyll of pigment mutant C-2A' of Scenedesmus obliquus grown in darkness depend upon the calcium concentration in the growth medium. In the presence of calcium both the protochlorophyllide and protochlorophyll levels decrease upon irradiation whereas the amount of photoreduced chlorophyllide increases.

In contrast to light-dependent protochlorophyllide reduction, the activity of light-independent protochlorophyllide reduction is higher in calcium free cultures compared to those grown in the presence of calcium. It is discussed whether calcium acts directly on the activity of the protochlorophyllide oxidoreductase or stabilizes the newly formed chlorophyllide.

(Received September 1, 1989; Accepted February 19, 1990)
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