Influence of Calcium on Formation and Reduction of Protochlorophyllide in the Pigment Mutant C-2A' of Scenedesmus obliquus |
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| Authors: | Kotzabasis, Kiriakos Miyachi, Shigetoh Senger, Horst |
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| Affiliation: | 1Fachbereich Biologie/Botanik, der Philipps Universit?t Marburg Lahnberge, 3550 Marburg, F.R.G.
2Institute of Applied Microbiology, University of Tokyo Bunkyo-Ku, Tokyo, JAPAN |
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| Abstract: | The levels of protochlorophyllide and protochlorophyll of pigmentmutant C-2A' of Scenedesmus obliquus grown in darkness dependupon the calcium concentration in the growth medium. In thepresence of calcium both the protochlorophyllide and protochlorophylllevels decrease upon irradiation whereas the amount of photoreducedchlorophyllide increases. In contrast to light-dependent protochlorophyllide reduction,the activity of light-independent protochlorophyllide reductionis higher in calcium free cultures compared to those grown inthe presence of calcium. It is discussed whether calcium actsdirectly on the activity of the protochlorophyllide oxidoreductaseor stabilizes the newly formed chlorophyllide. (Received September 1, 1989; Accepted February 19, 1990) |
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