Phylogenetic congruence and discordance among one morphological and three molecular data sets from Pontederiaceae

被引:92
作者
Graham, SW
Kohn, JR
Morton, BR
Eckenwalder, JE
Barrett, SCH
机构
[1] Univ Washington, Dept Bot, Seattle, WA 98195 USA
[2] Univ Calif San Diego, Dept Biol, La Jolla, CA 92093 USA
[3] Columbia Univ Barnard Coll, Dept Biol Sci, New York, NY 10027 USA
[4] Univ Toronto, Dept Bot, Toronto, ON M5S 3B2, Canada
关键词
chloroplast DNA; congruence tests; incongruence; morphology; ndhF; noise; Pontederiaceae; rbcL;
D O I
10.1080/106351598260572
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
A morphological data set and three sources of data from the chloroplast genome (two genes and a restriction site survey) were used to reconstruct the phylogenetic history of the pickerel-weed family Pontederiaceae. The chloroplast data converged towards a single tree, presumably the true chloroplast phylogeny of the family. Unrooted trees estimated from each of the three chloroplast data sets were identical or extremely similar in shape to each other and mostly robustly supported. There was no evidence of significant heterogeneity among the data sets, and the few topological differences seen among unrooted trees from each chloroplast data set are probably artifacts of sampling error on short branches. Despite well-documented differences in rates of evolution for different characters in individual data sets, equally weighted parsimony permits accurate reconstructions of chloroplast relationships in Pontederiaceae. A separate morphology-based data set yielded trees that were very different from the chloroplast trees. Although there was substantial support from the morphological evidence for several major clades supported by chloroplast trees, most of the conflicting phylogenetic structure on the morphology trees was not robust. Nonetheless, several statistical tests of incongruence indicate significant heterogeneity between molecules and morphology. The source of this apparent incongruence appears to be a low ratio of phylogenetic signal to noise in the morphological data.
引用
收藏
页码:545 / 567
页数:23
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