Molecular Biology and Evolution, Vol 9, 1061-1075, Copyright © 1992 by Society for Molecular Biology and Evolution
DP Pashley and LD Ke
A 2,256-bp sequence of the mitochondrial genome of a lepidopteran
(Spodoptera frugiperda) contains tRNAs for valine and leucine, the 16S
rRNA, and three-quarters of the ND-1 presumptive protein-coding gene. A
64-bp stretch of unknown function was located between the rRNA and leucine
tRNA. Sequence divergence in the 16S rRNA obtained from alignment with
published insect sequences is consistent with phylogenetic hypotheses, in
that Diptera and Lepidoptera are more closely related to each other (24%
sequence divergence) than either is to Hymenoptera (31%). Within the ND-1
gene, sequences for four additional Lepidoptera were generated for a 314-bp
region and contrasted with published sequences for the locust and
Drosophila. Sequence divergence in this region was consistent with accepted
phylogenetic relationships, but results of parsimony analyses were not.
Cladograms consistently recovered accepted higher level relationships
(monophyly of Lepidoptera), despite high homoplasy, but were unable to
resolve superfamily and family relationships within Lepidoptera, regardless
of the outgroup or character subset analyzed. Character analysis indicated
that homoplasy was decreased at higher levels when first- and second-codon
sites were used exclusively. At the lowest level (families), resolution was
enhanced by inclusion of third-codon sites. Inability of molecular data to
recover a well-established phylogeny may be rectified by additional
characters or taxa, but it is clear that homoplasy is sufficiently high to
caution against the acceptance of relationships generated with this
molecular region that are not extremely robust.
ORIGINAL ARTICLE
Sequence evolution in mitochondrial ribosomal and ND-1 genes in lepidoptera: implications for phylogenetic analyses [published erratum appears in Mol Biol Evol 1993 Jan;10(1):268]
Department of Entomology, Louisiana State University, Baton Rouge 70803.
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