Molecular Biology and Evolution, Vol 16, 354-362, Copyright © 1999 by Society for Molecular Biology and Evolution
JJ Doyle, JL Doyle and AH Brown
Variation at the single-copy nuclear locus histone H3-D was surveyed in the
diploid B-genome group of Glycine subgenus Glycine (Leguminosae:
Papilionoideae), which comprises three named Australian species and a
number of distinct but as yet not formally recognized taxa. A total of 23
alleles was identified in the 44 accessions surveyed. Only one individual
was clearly heterozygous, which is not surprising given the largely
autogamous breeding system of subgenus Glycine. Alleles differed by as many
as 19 nucleotide substitutions, nearly all in the three introns; length
variation was minimal. Phylogenetic analysis identified two shortest allele
trees with very little homoplasy, suggesting that recombination has been
rare. Both topological and data set incongruence were statistically
significant between histone H3-D allele trees and trees inferred from
chloroplast DNA haplotypes previously described from these same accessions.
Whereas the distribution of H3-D alleles agrees well with morphologically
based taxonomic groupings, chloroplast DNA haplotype polymorphisms
transgress species boundaries, suggesting that the chloroplast genome is
not tracking taxic relationships. Divergences among chloroplast DNA
haplotypes involved in such transgressive patterns appear to be more recent
than speciation events, suggesting hybridization rather than lineage
sorting.
ORIGINAL ARTICLE
Incongruence in the diploid B-genome species complex of Glycine (Leguminosae) revisited: histone H3-D alleles versus chloroplast haplotypes
L. H. Bailey Hortorium, Cornell University, Ithaca, New York 14853, USA. jjd5@cornell.edu
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