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THE PLANT CELL, Vol 5, Issue 4 465-475, Copyright © 1993 by American Society of Plant Biologists
A High-Resolution Gene Map of the Chloroplast Genome of the Red Alga Porphyra purpurea
M. Reith and J. Munholland
National Research Council of Canada, Institute for Marine Biosciences, 1411 Oxford Street, Halifax, Nova Scotia, B3H 3Z1 Canada
Extensive DNA sequencing of the chloroplast genome of the red alga Porphyra
purpurea has resulted in the detection of more than 125 genes. Fifty-eight
(approximately 46%) of these genes are not found on the chloroplast genomes
of land plants. These include genes encoding 17 photosynthetic proteins,
three tRNAs, and nine ribosomal proteins. In addition, nine genes encoding
proteins related to biosynthetic functions, six genes encoding proteins
involved in gene expression, and at least five genes encoding miscellaneous
proteins are among those not known to be located on land plant chloroplast
genomes. The increased coding capacity of the P. purpurea chloroplast
genome, along with other characteristics such as the absence of introns and
the conservation of ancestral operons, demonstrate the primitive nature of
the P. purpurea chloroplast genome. In addition, evidence for a
monophyletic origin of chloroplasts is suggested by the identification of
two groups of genes that are clustered in chloroplast genomes but not in
cyanobacteria.
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