Abstract:
: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.
journal_name
Mol Biol Evoljournal_title
Molecular biology and evolutionauthors
Gaut BS,Clark LG,Wendel JF,Muse SVdoi
10.1093/oxfordjournals.molbev.a025817subject
Has Abstractpub_date
1997-07-01 00:00:00pages
769-77issue
7eissn
0737-4038issn
1537-1719journal_volume
14pub_type
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