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The Utility of atpB Gene Sequences in Resolving Phylogenetic Relationships: Comparison with rbcL and 18S Ribosomal DNA Sequences in the Lardizabalaceae

Sara B. Hoot, Alastair Culham and Peter R. Crane
Annals of the Missouri Botanical Garden
Vol. 82, No. 2 (1995), pp. 194-207
DOI: 10.2307/2399877
Stable URL: http://www.jstor.org/stable/2399877
Page Count: 14
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The Utility of atpB Gene Sequences in Resolving Phylogenetic Relationships: Comparison with rbcL and 18S Ribosomal DNA Sequences in the Lardizabalaceae
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Abstract

The chloroplast gene atpB was sequenced for seven genera of the Lardizabalaceae and three outgroup taxa to assess its utility as a source of phylogenetic information. The resulting phylogenetic tree was compared with trees based on 18S nuclear ribosomal DNA and rbcL (chloroplast DNA) sequences, as well as a combination of all data (atpB, 18S, and rbcL) for the same taxa. Sequence divergence values, statistics related to patterns of character transformation, and indices measuring homoplasy and branch support were also compared. The topology of the trees derived from atpB, 18S, and a combination of all three sequence data sets were largely congruent. All phylogenies, with the exception of the tree derived from rbcL data, supported the monophyly of the Lardizabalaceae. All indicators of nucleotide substitution rate suggest that rbcL is the least conserved, atpB is intermediate, and 18S is the most conserved of the three genes sequenced. Measures of homoplasy also indicate that the rbcL tree is less strongly supported than those based on atpB, 18S, or a combination of atpB, 18S, and rbcL sequence data.

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