PMID: 16637496Apr 28, 2006Paper

Cryptic interspecific introgression and genetic differentiation within Gossypium aridum (Malvaceae) and its relatives

Evolution; International Journal of Organic Evolution
Inés Alvarez, J F Wendel

Abstract

Interspecific gene flow is increasingly recognized as an important evolutionary phenomenon in plants. A surprising observation is that historical introgression is often inferred between species that presently have geographic and reproductive barriers that would appear to prohibit the inferred sexual exchange. A striking example concerns Gossypium aridum (subsection Erioxylum); previous analyses have shown that populations from Colima (southwestern Mexico) have a chloroplast genome (cpDNA) similar to that of a different taxonomic subsection (Integrifolia) that presently is confined to Baja California and the Galapagos Islands, whereas other G. aridum populations share a cpDNA lineage with each other and with other species in subsection Erioxylum. To evaluate further the possibility that this cpDNA evidence reflects introgression as opposed to some other evolutionary process, as well as to explore patterns of genetic diversity and similarity in both subsections, we conducted amplified fragment-length polymorphism (AFLP) analysis using 50 populations representing all seven species in the two subsections. Genetic diversity is high in G. aridum, and is strongly correlated with geography, as are similarities among the five species in...Continue Reading

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Citations

Nov 29, 2014·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Lori L HinzeRichard G Percy
Sep 14, 2007·Molecular Ecology·Christopher J DixonGerald M Schneeweiss

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