Molecular Phylogenetic Relationships Among Angiosperms: An Overview Based on rbcL and 18S rDNA Sequences

摘要: During only the past 4 years, two large data sets of DNA sequences have greatly clarified broad picture angiosperm relationships and evolution. By far more extensive these is that based on chloroplast gene rbcL, with representing 499 species seed plants [1]. More recently, a smaller set 223 angiosperms has been compiled for nuclear 18S ribosomal RNA [2]. The general structural features, rate evolution, phylogenetic utility both genes previously reviewed [3,4] are not discussed here. For first time, diversity sequenced gene. Visual inspection rbcL rDNA topologies suggests high degree overall concordance. Particularly noteworthy support provided by topology those nontraditional suggested trees. example, sequence analysis confirms rbcL-based inferences Droseraceae Nepenthaceae closely related to Caryophyllidae number members Rosidae Dilleniidae as their closest relatives Asteridae.