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United States Department of Agriculture

Agricultural Research Service

Title: Genome Relationships among Polyploid Poa Pratensis and Other Poa Species Infrerred from Phylogenetic Anlaysis of Nuclear and Chloroplast DNA Sequences

Authors
item Patterson, J - UTAH STATE UNIV.
item Larson, Steven
item Johnson, P - UTAH STATE UNIV.

Submitted to: Genome
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: July 8, 2004
Publication Date: February 1, 2005
Citation: Patterson, J.T., Larson, S.R., Johnson, P.G. 2005. Genome relationships among polyploid poa pratensis and other poa species infrerred from phylogenetic anlaysis of nuclear and chloroplast dna sequences. Genome.

Interpretive Summary: The genus Poa comprises around 500 species that occur throughout the world, including the widely grown Kentucky bluegrass (P. pratensis L.). Hybridization and polyploidization have played a prominent role in the evolution of this complex genus, but limited information is available regarding genome relationships in Poa. Thus, we amplified, cloned, and compared DNA sequences of two nuclear genes (CDO504 and thioredoxin-like protein) and two chloroplast genome loci (ndhF and trnT-trnF) from twenty-two Poa species. Four distinct classes of sequences corresponding to four putative homoeologous loci from each nuclear gene were found with polyploid P. pratensis. Nuclear sequences from fifteen other Poa species were found to group with at least one P. pratensis homoeolog, whereas six species displayed sequences not present in P. pratensis. The nuclear genome phylogenies presented show the first evidence of diverse and related genomes in the genus Poa.

Technical Abstract: The genus Poa comprises around 500 species that occur throughout the world, including the widely grown Kentucky bluegrass (P. pratensis L.). Hybridization and polyploidization have played a prominent role in the evolution of this complex genus, but limited information is available regarding genome relationships in Poa. Thus, we amplified, cloned, and compared DNA sequences of two nuclear genes (CDO504 and thioredoxin-like protein) and two chloroplast genome loci (ndhF and trnT-trnF) from twenty-two Poa species. Four distinct classes of sequences corresponding to four putative homoeologous loci from each nuclear gene were found within polyploid P. pratensis. Nuclear sequences from fifteen other Poa species were found to group with at least one P. pratensis homoeolog, whereas six species displayed sequences not present in P. pratensis. The nuclear genome phylogenies presented show the first evidence of diverse and related genomes in the genus Poa.

Last Modified: 8/21/2014
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