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Plant Physiology 79:231-236 (1985)
© 1985 American Society of Plant Biologists

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Articles

Chloroplast Protein Synthesis in the Chromophytic Alga Olisthodiscus luteus1,2

Cell Cycle Analysis

Michael E. Reith3 and Rose Ann Cattolico

Department of Botany KB-15, University of Washington, Seattle, Washington 98195

This study represents the first report on chloroplast protein synthesis during the synchronous cell growth of a chromophytic (chlorophyll a,c) plant. When the unicellular alga Olisthodiscus luteus is maintained on a 12-hour light:12-hour dark cycle, cell and chloroplast number double every 24 hours. A temporal separation between these two events occurs. Measurements of chloroplast and total cellular protein values suggest that polypeptide synthesis occurs mainly in the light portion of the cell cycle, and pulse chase studies demonstrate that chloroplast proteins made in the light are not degraded in the dark. Data support the following conclusions: (a) a similar complement of chloroplast DNA coded proteins is made at all phases of the light portion of the cell cycle, and (b) chloroplast protein synthesis is a light rather than a cell cycle mediated response.

3 Present address: Department of Botany, University of Toronto, Toronto, Ontario, Canada M5S-1A1.

1 This work was supported by a National Science Foundation Grant (PCM-8022653) to R. A. C. and a Predoctoral Research Service Award (GM 07270) from National Institutes of Health to M. E. R.

2 Dedicated to the memory of Professor Raymond E. Jones.




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T. Hariharan, P. J. Johnson, and R. Ann Cattolico
Purification and Characterization of Phosphoribulokinase from the Marine Chromophytic Alga Heterosigma carterae
Plant Physiology, May 1, 1998; 117(1): 321 - 329.
[Abstract] [Full Text]


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Copyright © 1985 by the American Society of Plant Biologists