期刊
MOLECULAR PHYLOGENETICS AND EVOLUTION
卷 54, 期 1, 页码 211-225出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ympev.2009.08.032
关键词
Molecular phylogeny; Lepisorus; Drymotaenium; Belvisia; Platygyria; Morphological character evolution; Chromosome numbers; Cytology
资金
- National Natural Science Foundation of China [30770166]
- Deutsche Forschungsgemeinschaft (DFG) [SCHN 785/2-2]
- DAAD-CAS
Phylogenetic relationships within the paleotropical genus Lepisorus (Polypodiaceae) were investigated using plastid DNA sequences from four regions: rbcL, rps4 and rps4-trnS IGS, trnL intron plus trnL-F IGS, rbcL-atpB IGS. Over 4000 nucleotides were sequenced for 77 specimens belonging to 54 species. Each cpDNA region was analyzed separately and combined into a single dataset. All phylogenetic analyses, maximum parsimony, maximum likelihood and Bayesian Inference of phylogeny, revealed the paraphyly of Lepisorus with the monotypic Drymotaenium miyoshianum and of the paleotropical genus Belvisia nested within the Lepisorus clade. Nine well-supported major clades were found. The phylogenetic results provided new evidence for the sectional classification of Lepisorus. The evolution of three morphological characters, clathrateness of rhizome scales, margin of rhizome scales and defoliated leaves, and the evolution of the karyotype, were reconstructed to identify lineage specific phenotypic character states or combination of characters. Unique character combinations, rather than synapomorphies, were found to be of systematic value in sectional delimitation. The variation of chromosome numbers is largely due to a single aneuploidy event instead of a stepwise reduction during the evolutionary history of this genus. (C) 2009 Elsevier Inc. All rights reserved.
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