Noncoding plastid trnT-trnF sequences reveal a well resolved phylogeny of basal angiosperms

被引:296
作者
Borsch, T
Hilu, KW
Quandt, D
Wilde, V
Neinhuis, C
Barthlott, W
机构
[1] Univ Bonn, Inst Bot, D-53115 Bonn, Germany
[2] Univ Bonn, Bot Garten, D-53115 Bonn, Germany
[3] Virginia Polytech Inst & State Univ, Dept Biol, Blacksburg, VA 24061 USA
[4] Forschungsinst Senckenberg, Frankfurt, Germany
关键词
angiosperms; chloroplast genome; group I intron; molecular evolution; noncoding DNA; phylogeny; secondary structure; trnT-trnF;
D O I
10.1046/j.1420-9101.2003.00577.x
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Recent contributions from DNA sequences have revolutionized our concept of systematic relationships in angiosperms. However, parts of the angiosperm tree remain unclear. Previous studies have been based on coding or rDNA regions of relatively conserved genes. A phylogeny for basal angiosperms based on noncoding, fast-evolving sequences of the chloroplast genome region trnT-trnF is presented. The recognition of simple direct repeats allowed a robust alignment. Mutational hot spots appear to be confined to certain sectors, as in two stem-loop regions of the trnL intron secondary structure. Our highly resolved and well-supported phylogeny depicts the New Caledonian Amborella as the sister to all other angiosperms, followed by Nymphaeaceae and an Austrobaileya -Illicium -Schisandra clade. Ceratophyllum is substantiated as a close relative of monocots, as is a monophyletic eumagnoliid clade consisting of Piperales plus Winterales sister to Laurales plus Magnoliales. Possible reasons for the striking congruence between the trnT-trnF based phylogeny and phylogenies generated from combined multi-gene, multi-genome data are discussed.
引用
收藏
页码:558 / 576
页数:19
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