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Are mitochondrial genes useful for the analysis of monocot relationships?

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A phylogenetic analysis of monocots and related dicots was conducted, using a four-gene matrix consisting of two genes from the plastid genome (matK and rbcL) and two from the mitochondrial genome (atpA/atp1 and cob). The taxon sample includes 101 monocots and 36 dicots, and all four genes were sampled for all 137 taxa. Jackknife support was assessed for clades resolved by the four-gene analysis, and compared to support for the same clades by each of the four three-gene subset matrices, in order to quantify the degree to which each gene contributed to or detracted from support for each clade. Instances of positively and negatively correlated support for clades by genes of the same and different genomes were observed. In particular, the placement of Acorus within a clade that also includes Tofieldiaceae, Araceae, and Alismatales s.s., as opposed to its frequent placement as sister of all other monocots, is supported by atpA and matK. The results indicate that genes from the mitochondrial genome provide a unique test of relationships that have been inferred with plastid-encoded genes.


Document Type: Research Article

Affiliations: 1: L. H. Bailey Hortorium and Department of Plant Biology, Cornell University, Ithaca, New York 14853, U.S.A. 2: Botanical Garden and Museum, Natural History Museum of Denmark, Sølvgade 83, Opg. S, DK-1307 Copenhagen K, Denmark 3: Institute of Systematic Botany, New York Botanical Garden, Bronx, New York 10458, U.S.A. 4: Department of Biology, Millersville University, Millersville, Pennsylvania 17551, U.S.A. 5: Department of Biology, Colorado State University, Fort Collins, Colorado 80523, U.S.A. 6: Harvard University Herbaria, Harvard University, Cambridge, Massachusetts 02138, U.S.A. 7: Department of Plant and Microbial Biology, University of California, Berkeley, California 94720, U.S.A.

Publication date: 2006-11-01

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