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Plant and Cell Physiology, 1986, Vol. 27, No. 6 1127-1139
© 1986

Article

Changes in Molecular Organization of Thylakoid Membranes during the Cell Cycle of Scenedesmus obliquus1

Horst Senger and Karin Krupinska

Fachbereich Biologie/Bolanik, Philipps-Universilät Lahnberge, D-3550 Marburg, F.R.C.

Cultures of Scenedesmus obliquus, synchronized by a light-dark regime of 14 : 10 hours, show distinct changes in their photosynthetic activity with a maximum at the 8th h and a minimum at the 16th h after onset of illumination. The activity differences occur under limiting light-intensities as well as under saturating light-intensities, indicating at least two different factors regulating photosynthesis during the cell cycle.

Based on differences in the ratio of oligomeric to monomeric pigment-protein complexes between 8 and 16 h old cells, and Mg2+-induced effects on the fluorescence properties of chloroplast particles deriving from 8 and 16 h old cells, changes in the molecular organization of the photosynthetic apparatus are documented. These changes might regulate energy distribution within the photosynthetic apparatus during ontogenetic development and are supposed to be responsible for the differences in activity under limiting light-intensities.

By analysis of pure PS II-particles from cells with maximal and minimal photosynthetic activity it could be demonstrated that changes occurring in PS II proper account for the differences in photosynthetic capacity measured under saturing light. A model demonstrating the changes in the molecular organization of thylakoid membranes occurring during ontogenetic development of Scenedesmus obliquus is presented.

1 This paper is dedicated to the memory of Hiroshi Tamiya, a pioneer in the field of plant physiology and a fatherly friend.

(Received December 27, 1985; Accepted June 18, 1986)
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