Abstract：
:Liverworts are well supported as the sister group to all other land plants (embryophytes) by molecular data. Observations strongly supporting this earliest dichotomy in embryophyte evolution are the strikingly different introns occurring in the mitochondrial DNAs of liverworts versus non-liverwort embryophytes (NLE), including the mosses. A final conclusion on the most basal lineages of mosses, for which genera such as Sphagnum and Takakia are the most likely candidates, is lacking. We have now investigated cox1i624, a mitochondrial group I intron conserved between the moss Physcomitrella patens and the liverwort Marchantia polymorpha. Focusing on a sampling of liverwort and moss genera, which had previously been identified as early branching taxa in their respective clades, we find that group I intron cox1i624 is universally conserved in all 33 mosses and 11 liverworts investigated. The group I intron core secondary structure is well conserved between the two ancient land plant clades. However, whereas dramatic size reductions are seen in the moss phylogeny, exactly the opposite is observed for liverworts. The cox1i624g1 locus was used for phylogenetic tree reconstruction also in combination with data sets of nad5i753g1 as well as chloroplast loci rbcL and rps4. The phylogenetic analyses revealed (i) very good support for the Treubiopsida as sister clade to all other liverworts, (ii) a sister group relationship of the nematodontous Tetraphidopsida and Polytrichopsida and (iii) two rivalling hypotheses about the basal-most moss genus with mitochondrial loci suggesting an isolated Takakia as sister to all other mosses and chloroplast loci indicating a Takakia-Sphagnum clade.
journal_name
J Mol Evoljournal_title
Journal of molecular evolutionauthors
Volkmar U,Knoop Vdoi
10.1007/s00239-010-9348-9subject
Has Abstractpub_date
2010-05-01 00:00:00pages
506-18issue
5eissn
0022-2844issn
1432-1432journal_volume
70pub_type
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journal_title：Journal of molecular evolution
pub_type： 杂志文章
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journal_title：Journal of molecular evolution
pub_type： 杂志文章
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journal_title：Journal of molecular evolution
pub_type： 杂志文章
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更新日期：1991-01-01 00:00:00
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journal_title：Journal of molecular evolution
pub_type： 信件
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更新日期：2013-06-01 00:00:00
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pub_type： 杂志文章
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更新日期：2015-08-01 00:00:00
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journal_title：Journal of molecular evolution
pub_type： 杂志文章
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更新日期：1990-04-01 00:00:00
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pub_type： 杂志文章
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更新日期：2016-05-01 00:00:00
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journal_title：Journal of molecular evolution
pub_type： 杂志文章
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更新日期：2007-03-01 00:00:00
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journal_title：Journal of molecular evolution
pub_type： 杂志文章
doi：10.1007/BF00170674
更新日期：1995-08-01 00:00:00
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journal_title：Journal of molecular evolution
pub_type： 杂志文章
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更新日期：2010-10-01 00:00:00
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更新日期：2014-12-01 00:00:00
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pub_type： 杂志文章
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更新日期：2010-06-01 00:00:00
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pub_type： 信件
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更新日期：1998-01-01 00:00:00
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更新日期：1993-05-01 00:00:00
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