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a Department of Botany, Bessey Hall, Iowa State University, Ames, Iowa 50011
Phylogenetic resolution is often low within groups of recently diverged taxa due to a paucity of phylogenetically informative characters. We tested the relative utility of seven noncoding cpDNA regions and a pair of homoeologous nuclear genes for resolving recent divergences, using tetraploid cottons (Gossypium) as a model system. The five tetraploid species of Gossypium are a monophyletic assemblage derived from an allopolyploidization event that probably occurred within the last 0.52 million years. Previous analysis of cpDNA restriction site data provided only partial resolution within this clade despite a large number of enzymes employed. We sequenced three cpDNA introns (rpl16, rpoC1, ndhA) and four cpDNA spacers (accD-psaI, trnL-trnF, trnT-trnL, atpB-rbcL) for a total of over 7 kb of sequence per taxon, yet obtained only four informative nucleotide substitutions (0.05%) resulting in incomplete phylogenetic resolution. In addition, we sequenced a 1.65-kb region of a homoeologous pair of nuclear-encoded alcohol dehydrogenase (Adh) genes. In contrast with the cpDNA sequence data, the Adh homoeologues yielded 25 informative characters (0.76%) and provided a robust and completely resolved topology that is concordant with previous cladistic and phenetic analyses. The enhanced resolution obtained using the nuclear genes reflects an approximately three- to sixfold increase in nucleotide substitution rate relative to the plastome spacers and introns.
Key Words: alcohol dehydrogenase Gossypium molecular phylogenetics noncoding chloroplast DNA polyploidy
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