Molecular Biology and Evolution, Vol 1, 291-301, Copyright © 1984 by Society for Molecular Biology and Evolution
SE Curtis and MT Clegg
Comparative data on the evolution of chloroplast genes are reviewed. The
chloroplast genome has maintained a similar structural organization over
most plant taxa so far examined. Comparisons of nucleotide sequence
divergence among chloroplast genes reveals marked similarity across the
plant kingdom and beyond to the cyanobacteria (blue-green algae). Estimates
of rates of nucleotide substitution indicate a synonymous rate of 1.1 x
10(-9) substitutions per site per year. Noncoding regions also appear to be
constrained in their evolution, although addition/deletion events are
common. There have also been evolutionary changes in the distribution of
introns in chloroplast encoded genes. Relative to mammalian mitochondrial
DNA, the chloroplast genome evolves at a conservative rate.
ORIGINAL ARTICLE
Molecular evolution of chloroplast DNA sequences
Department of Genetics, North Carolina State University, Raleigh 27650.
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