Molecular Biology and Evolution, Vol 14, 455-460, Copyright © 1997 by Society for Molecular Biology and Evolution
A Eyre-Walker and BS Gaut
Synonymous substitution rates have been shown to vary among evolutionary
lineages of both nuclear and organellar genes across a broad range of
taxonomic groups. In animals, rate heterogeneity does not appear to be
correlated across nuclear and mitochondrial genes. In this paper, we
contrast substitution rates in two plant groups and show that grasses
evolve more rapidly than palms at synonymous sites in a mitochondrial, a
nuclear, and a plastid gene. Furthermore, we show that the relative rates
of synonymous substitution between grasses and palms are similar at the
three loci. The correlation in synonymous substitution rates across genes
is particularly striking because the three genes evolve at very different
absolute rates. In contrast, relative rates of nonsynonymous substitution
are not conserved among the three genes.
ORIGINAL ARTICLE
Correlated rates of synonymous site evolution across plant genomes
Center for Theoretical and Applied Genetics, Rutgers University, New Brunswick, New Jersey 08903, USA.
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