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Iowa State University

Plant Sciences

Ecology, Evolution and Organismal Biology Publications

2004

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Use Of Nuclear Genes For Phylogeny Reconstruction In Plants, Randall L. Small, Richard Clark Cronn, Jonathan F. Wendel Jan 2004

Use Of Nuclear Genes For Phylogeny Reconstruction In Plants, Randall L. Small, Richard Clark Cronn, Jonathan F. Wendel

Ecology, Evolution and Organismal Biology Publications

Molecular data have had a profound impact on the field of plant systematics, and the application of DNA-sequence data to phylogenetic problems is now routine. The majority of data used in plant molecular phylogenetic studies derives from chloroplast DNA and nuclear rDNA, while the use of low-copy nuclear genes has not been widely adopted. This is due, at least in part, to the greater difficulty of isolating and characterising low-copy nuclear genes relative to chloroplast and rDNA sequences that are readily amplified with universal primers. The higher level of sequence variation characteristic of low-copy nuclear genes, however, often compensates for ...


Cryptic Trysts, Genomic Mergers, And Plant Speciation, Richard Clark Cronn, Jonathan F. Wendel Jan 2004

Cryptic Trysts, Genomic Mergers, And Plant Speciation, Richard Clark Cronn, Jonathan F. Wendel

Ecology, Evolution and Organismal Biology Publications

It has long been recognized that interspecific hybridization is common in plants, enhancing processes of diversification and speciation. With the widespread utilization of molecular tools, interspecific hybridization – as revealed through incongruence among two or more phylogenetic data sets – is now inferred to be even more prevalent than indicated by morphological and cytogenetic evidence. UsingGossypium as an example, we show how multiple molecular markers have implicated a high frequency of historical hybridization between lineages whose modern descendants are strongly isolated by geography and intrinsic genetic barriers. For example, transoceanic dispersal of propagules from Africa to the New World led to ...