Molecular Biology and Evolution, Vol 16, 491-501, Copyright © 1999 by Society for Molecular Biology and Evolution
RL Small, JA Ryburn and JF Wendel
Levels of genetic diversity within and among populations and species are
shaped by both external (population-level) and internal (genomic and genic)
evolutionary forces. To address the effect of internal pressures, we
estimated nucleotide diversity for a pair of homoeologous Adh loci in an
allotetraploid species, Gossypium hirsutum. These data represent the first
such estimates for a pair of homoeologous nuclear loci in plants. Estimates
of nucleotide diversity for AdhA in Gossypium are lower than those for any
plant nuclear gene yet described. This low diversity appears to reflect
primarily a history of repeated, severe genetic bottlenecks associated with
both speciation and recent domestication, supplemented by an unusually slow
nucleotide substitution rate and an autogamous breeding system. While not
statistically supportable, the sum of the observations also suggest
differential evolutionary dynamics at each of the homoeologous loci.
ORIGINAL ARTICLE
Low levels of nucleotide diversity at homoeologous Adh loci in allotetraploid cotton (Gossypium L.)
Department of Botany, Iowa State University, Ames 50011, USA.
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