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Discordance of chloroplast and nuclear ribosomal DNA data in Osmorhiza (Apiaceae)
Author(s) -
Yoo KiOug,
Lowry Porter P.,
Wen Jun
Publication year - 2002
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.3732/ajb.89.6.966
Subject(s) - biology , ndhf , chloroplast dna , intergenic region , ribosomal dna , phylogenetic tree , monophyly , botany , ribosomal rna , evolutionary biology , genetics , gene , genome , clade
Phylogenetic studies were conducted to evaluate interspecific relationships in Osmorhiza (Apiaceae: Apioideae) using sequences of the ITS regions of nuclear ribosomal DNA, the chloroplast ndhF gene, and two noncoding regions ( trnL intron, and trnL [UAA] 3′ exon‐ trnF [GAA] intergenic spacer). All data sets suggest the monophyly of the New World taxa and showed that Osmorhiza aristata from Asia is relatively divergent from other members of the genus, even though it is morphologically similar to the eastern North American O. claytonii and O. longistylis . The ITS and chloroplast DNA trees differ in the relationships among the New World taxa, especially the phylogenetic position of O. occidentalis , O. glabrata , and O. depauperata . The lack of congruence between the two data sets may be a result of hybridization or introgression. Although there is high discordance between nrITS and two chloroplast DNA data sets, the latter two show similar topologies.