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Plant Physiology 72:409-414 (1983)
© 1983 American Society of Plant Biologists

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Articles

Photosynthetic Unit Organization in a Red Alga 1

Relationships between Light-Harvesting Pigments and Reaction Centers

Thomas A. Kursar2 and Randall S. Alberte3

Department of Biophysics and Theoretical Biology, Barnes Laboratory, The University of Chicago, Chicago, Illinois 60637, Department of Biology, Barnes Laboratory, The University of Chicago, Chicago, Illinois 60637

The relative concentration of biliproteins, phycobilisomes, chlorophyll a, and reaction centers I and II are reported for Neoagardhiella bailyei, a macrophytic red alga collected in the field and compared with Anacystis nidulans, a cyanobacterium cultured in the laboratory. The ratios of chlorophyll to reaction center I, of chlorophyll to reaction center II, and the mass of phycobiliprotein per reaction center II are quite similar in Neoagardhiella and Anacystis, supporting the concept that the red algal chloroplast is derived from a cyanobacterial progenitor. The ratios of reaction center I to reaction center II are about 2.3 in both species. The Anacystis phycobilisome has about 40% of the mass of the Neoagardhiella phycobilisome, 4.9 and 14.9 x 106 daltons, respectively. The reaction center II/phycobilisome ratio is about 1.7 in Anacystis and 4.1 in Neoagardhiella. Phycobilisome size and physical restrictions on phycobilisome packing may be a major constraint on the reaction center II-phycobilisome association and the assembly of the photosynthetic membrane in both the red algae and cyanobacteria.

2 Present address: Department of Biology, University of Utah, Salt Lake City, UT 84112. Supported by National Institutes of Health Grant GM23944.

3 Supported by a Mellon Foundation Fellowship during a portion of the research period. To whom reprint requests should be addressed.

1 Supported by National Science Foundation Grant PCM 78-10535, and in part by the Louis Block Foundation, The University of Chicago.




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Copyright © 1983 by the American Society of Plant Biologists