title: Molecular phylogeny of horsetails (Equisetum) including chloroplast atpB sequences.
abstract: Equisetum is a genus of 15 extant species that are the sole surviving representatives of the class Sphenopsida. The generally accepted taxonomy of Equisetum recognizes two subgenera: Equisetum and Hippochaete. Two recent phylogenetical studies have independently questioned the monophyly of subgenus Equisetum. Here, I use original (atpB) and published (rbcL, trnL-trnF, rps4) sequence data to investigate the phylogeny of the genus. Analyses of atpB sequences give an unusual topology, with E. bogotense branching within Hippochaete. A Bayesian analysis based on all available sequences yields a tree with increased resolution, favoring the sister relationships of E. bogotense with subgenus Hippochaete.
authors.affiliation: Laboratoire Ecologie Systématique et Evolution, UMR 8079 CNRS-Université Paris-Sud, Bâtiment 362, Université Paris-Sud, 91405, Orsay Cedex, France. Jean-Michel.Guillon@u-psud.fr
authors.forename: Jean-Michel
authors.initials: JM
authors.lastname: Guillon
mesh_terms: D001483:Base Sequence; D002736:Chloroplasts / Q000235:genetics*; D017931:DNA Primers; D020829:Equisetum / Q000145:classification / Q000235:genetics*; D010802:Phylogeny; D010940:Plant Proteins / Q000235:genetics*
chemical_list: D017931:DNA Primers; D010940:Plant Proteins