PRELIMINARY INFERENCES OF THE PHYLOGENY OF BRYOPHYTES FROM NUCLEAR-ENCODED RIBOSOMAL-RNA SEQUENCES

被引:60
作者
WATERS, DA
BUCHHEIM, MA
DEWEY, RA
CHAPMAN, RL
机构
[1] LOUISIANA STATE UNIV, DEPT BOT, BATON ROUGE, LA 70803 USA
[2] CENT OREGON COMMUNITY COLL, DIV SCI, BEND, OR 97701 USA
关键词
D O I
10.2307/2445160
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Ribosomal RNA sequences and cladistic analysis were used to infer a phylogeny for eight bryophyte taxa. Portions of the cytoplasmic large (26S-like) and small (18S-like) subunit ribosomal RNA genes were sequenced for three marchantioid liverworts (Asterella, Conocephalum, and Riccia), three mosses (Atrichum, Fissidens, and Plagiomnium), and two hornworts (Phaeoceros and Notothylas). Cladistic analysis of these data suggests that the homworts are the sister group to the mosses, the mosses and hornworts form a clade that is sister to the tracheophytes, and the liverworts form a clade sister to the other land plants. These results differ from previous cladistic analyses based on morphology, ultrastructure, and biochemistry, wherein the mosses alone are sister group to the tracheophytes. We conclude that cladistic analysis of molecular data can provide an independent data set for the study of bryophyte phylogeny, but the differences between the molecular and morphological results are a topic for further investigation.
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页码:459 / 466
页数:8
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