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Plant and Cell Physiology, 1985, Vol. 26, No. 6 1195-1198
© 1985

Short Communication

Adaptation, Readaptation and Synthesis of Hydrogenases in Scenedesmus obliquus

Kolandaiswamy Francis1 and Horst Senger

Fachbereich Biologie/Botanik, Universität Marburg Lahnberge, D-3550 Marburg, BRD

Scenedesmus cells reach full hydrogen activity after 2.5 h of anaerobic adaptation. Exposure to oxygen inactivates the hydrogenase immediately. Readaptation occurs with the same kinetics as primary adaptation. The fast activation and reactivation as well as the insensibility to cycloheximide suggest that hydrogenase, inactive or activated, is present in the chloroplast all the time. The activation and even more the readaptation are sensitive to chloramphenicol. Thus, we propose that hydrogenase itself or an activating protein in the chloroplast have a rather fast turnover.

1 Present address: Pharathiar University, Dept. of Botany, Coimbatore, India.

(Received March 2, 1985; Accepted June 11, 1985)
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