The internal transcribed spacer 2 region of the nuclear ribosomal DNA and the phylogeny of the moss family Hylocomiaceae

被引:3
|
作者
Chaing, TY [1 ]
Schaal, BA
机构
[1] Natl Cheng Kung Univ, Dept Biol, Tainan 701, Taiwan
[2] Washington Univ, Dept Biol, St Louis, MO 63130 USA
关键词
Hylocomiaceae; internal transcribed region 2; molecular evolution; phylogeny; relative rate test;
D O I
10.1007/BF00986338
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Nucleotide variation of the internal transcribed spacer 2 region of nuclear ribosomal DNA was used to estimate the phylogeny of the moss family Hylocomiaceae. Both parsimony and neighbour-joining analyses support the monophyly of this family, as well as all seven of the genera within the family. Rhytidium? appears as the basal taxon and a North American clade comprising Rhytidiopsis and Thelia is indicated. The analyses suggest that Hylocomium s.l., a polyphyletic genus, should be divided into three separate genera. The rate of nucleotide substitutions of the ITS-2 region in the Hylocomiaceae is consistent with the hypothesis of a molecular clock based on a relative rate tests. A nearly constant rate of 6.42 x 10(-10) substitutions per site and per year is postulated for the family, a rate close to that of the Winteraceae and slower than that of Lopezia.
引用
收藏
页码:127 / 137
页数:11
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