Phylogenetic relationships of Corylus species (Betulaceae) based on nuclear ribosomal DNA ITS region and chloroplast matK gene sequences
Phylogenetic relationships of Corylus species (Betulaceae) based on nuclear ribosomal DNA ITS region and chloroplast matK gene sequences
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DOI：
10.2307/2666730
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发表时间：
2000-10-01
影响因子：
1
通讯作者：
Mehlenbacher, SA
中科院分区：
文献类型：
--
作者：
Erdogan, V;Mehlenbacher, SA
利用核糖体DNA内转录间隔区和叶绿体matK基因序列，研究了栎属(桦科)12种29个基因型的系统发育关系。这两种基因给出了不同的结果。Corylus的ITS区只有22个信息性字符。然而，栎属中的几个分支已被解析：灌木种C.avellana、C.Maxima、C.americana和C.Heterophylla；另一组灌木种C.cornuta、C.calfornica和C.sieboldiana；以及乔木C.colurna、C.chinensis和C.jacquemontii，形成一个副形态组。栎属形成了栎属分支的最底部的分支。严格的一致性树与种间杂交关系和形态分类的结果一致。MatK序列仅产生10个信息性字符。严格共识树上出现了两个簇，一个是亚洲和欧洲物种，另一个是北美物种。然而，这种基于matK序列的分类与目前公认的分类不一致，信息特征的缺乏排除了从matK数据中进行更确定的推断。
The phylogenetic relationships of 29 genotypes representing 12 species of the genus Corylus (Betulaceae) were investigated using sequences of the internal transcribed spacer regions of the nuclear ribosomal DNA and the chloroplast matK gene. The two genes gave different results. The ITS region in Corylus yielded only 22 informative characters. Nevertheless, several clades in Corylus were resolved: the shrub species C. avellana, C. maxima, C. americana, and C. heterophylla; another group of shrub species C. cornuta, C. californica, and C. sieboldiana; and the tree species C. colurna, C. chinensis, and C. jacquemontii which formed a paraphyletic group. Corylus ferox formed the basal-most branch of the Corylus clades. The strict consensus tree was congruent with the results of interspecific hybridization relationships and morphological classification. The matK sequence yielded only 10 informative characters. Two clusters appeared on the strict consensus tree, one with Asian and European species, and the other with North American species. However, this classification based on matK sequences was not in agreement with currently accepted taxonomic classification, and the paucity of informative characters precludes more definitive inferences from the matK data.