title: Genome size, fluorochrome banding, and karyotype evolution in some Hypochoeris species.
abstract: Four South American and two European species of Hypochoeris (Asteraceae) were studied using fluorochrome banding, and genome size was determined by flow cytometry, in order to obtain information about microevolution in this genus and about its primary origin. Fluorochrome banding patterns showed GC-rich repeated sequences, particularly around the nucleolar organizer regions. Few differences appeared among the South American species. Nevertheless, determination of nuclear DNA content and base composition revealed significant differences among these species. The phylogenetic position of Hypochoeris robertia, which has the smallest DNA content, is discussed with regard to chromosome evolution in this genus.
authors.affiliation: Laboratoire d'Evolution et Systématique Végétales, Centre National de la Recherche Scientifique (Unité de Recherche Associée 1492), Université Paris XI, Orsay, France.
authors.forename: M
authors.initials: M
authors.lastname: Cerbah
authors.forename: J
authors.initials: J
authors.lastname: Coulaud
authors.forename: B
authors.initials: B
authors.lastname: Godelle
authors.forename: S
authors.initials: S
authors.lastname: Siljak-Yakovlev
mesh_terms: D005075:Biological Evolution; D002871:Chromosome Banding; D005456:Fluorescent Dyes; D018745:Genome, Plant; D017404:In Situ Hybridization, Fluorescence; D007621:Karyotyping; D008540:Meiosis; D010944:Plants / Q000235:genetics*; D013045:Species Specificity
chemical_list: D005456:Fluorescent Dyes