Molecular Biology and Evolution, Vol 14, 769-777, Copyright © 1997 by Society for Molecular Biology and Evolution
BS Gaut, LG Clark, JF Wendel and SV Muse
We examine rate heterogeneity among evolutionary lineages of the grass
family at two plasmid loci, ndhF and rbcL, and we introduce a method to
determine whether patterns of rate heterogeneity are correlated between
loci. We show both that rates of synonymous evolution are heterogeneous
among grass lineages and that are heterogeneity is correlated between loci
at synonymous sites. At nonsynonymous sites, the pattern of rate
heterogeneity is not correlated between loci, primarily due to an aberrant
pattern of rate heterogeneity at nonsynonymous sites of rbcL. We compare
patterns of synonymous rate heterogeneity to predictors based on the
generation time effect and the speciation rate hypotheses. Although there
is some evidence for generation time effects, neither generation time
effects nor speciation rates appear to be sufficient to explain patterns of
rate heterogeneity in the grass plastid sequences.
ORIGINAL ARTICLE
Comparisons of the molecular evolutionary process at rbcL and ndhF in the grass family (Poaceae)
Department of Plant Sciences, Rutgers University, New Brunswick, New Jersey 08903, USA. gaut@ahab.rutgers.edu
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