Relative rates of nucleotide substitution at the rbcL locus of monocotyledonous plants

We subjected 35 rbcL nucleotide sequences from monocotyledonous taxa to maximum likelihood relative rate tests and estimated relative differences in rates of nucleotide substitution between groups of sequences without relying on knowledge of divergence times between taxa. Rate tests revealed that th...

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Bibliographic Details
Published in:Journal of molecular evolution 1992-10, Vol.35 (4), p.292-303
Main Authors: Gaut, B.S, Muse, S.V, Clark, W.D, Clegg, M.T
Format: Article
Language:English
Subjects:
Arecaceae
Biochemistry & Molecular Biology
Biological and medical sciences
Biological evolution
Evolutionary Biology
Fundamental and applied biological sciences. Psychology
Genes, Plant
Genetics & Heredity
Genetics of eukaryotes. Biological and molecular evolution
Life Sciences & Biomedicine
Liliopsida
loci
Mathematics
Mutation - genetics
nucleotide sequences
Phylogeny
Plants - classification
Plants - enzymology
Plants - genetics
Polymerase Chain Reaction
Ribulose-Bisphosphate Carboxylase - genetics
Science & Technology
Zea mays
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Summary:We subjected 35 rbcL nucleotide sequences from monocotyledonous taxa to maximum likelihood relative rate tests and estimated relative differences in rates of nucleotide substitution between groups of sequences without relying on knowledge of divergence times between taxa. Rate tests revealed that there is a hierarchy of substitution rate at the rbcL locus within the monocots. Among the taxa analyzed the grasses have the most rapid substitution rate; they are followed in rate by the Orchidales, the Liliales, the Bromeliales, and the Arecales. The overall substitution rate for the rbcL locus of grasses is over 5 times the substitution rate in the rbcL of the palms. The substitution rate at the third codon positions in the rbcL of the grasses is over 8 times the third position rate in the palms. The pattern of rate variation is consistent with the generation-time-effect hypothesis. Heterogenous rates of substitution have important implications for phylogenetic reconstruction.
ISSN:0022-2844
1432-1432
DOI:10.1007/bf00161167