55 (4) • November 2006: 857–870 Davis & al. • Mitochondrial genes for monocot phylogeny Are mitochondrial genes useful for the analysis of monocot relationships? Jerrold I. Davis1, Gitte Petersen2, Ole Seberg2, Dennis W. Stevenson3, Christopher R. Hardy4, Mark P. Simmons5, Fabian A. Michelangeli3, Douglas H. Goldman6, Lisa M. Campbell3, Chelsea D. Specht7 & James I. Cohen1 1 L. H. Bailey Hortorium and Department of Plant Biology, Cornell University, Ithaca, New York 14853, U.S.A.
[email protected] (author for correspondence). 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. 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.