Low Intralineage Divergence in Ceratozamia (Zamiaceae) Detected with Nuclear Ribosomal DNA ITS and Chloroplast DNA trnL-F Non-coding Region
Low Intralineage Divergence in Ceratozamia (Zamiaceae) Detected with Nuclear Ribosomal DNA ITS and Chloroplast DNA trnL-F Non-coding Region
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用核核糖体 DNA ITS 和叶绿体 DNA trnL-F 非编码区检测 Ceratozamia（Zamiaceae）的低谱系内分化
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
A. Vovides
中科院分区：
文献类型：
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作者：
D. González;A. Vovides
摘要Ceratozamia属植物约有16种，仅分布于墨西哥新火山山脉的南北两侧。系统发育关系进行了探讨Ceratozamia种，使用24个范例和7个假定的外群类群。我们研究了叶绿体和核基因组中两个非编码区在分子水平上的变异。虽然ITS和trnL-F非编码区的变化率被认为是适当的，以恢复在此分类水平上的变化，只有33个核苷酸位置的2081信息。尽管低水平的变化，分析表明，Ceratozamia是单系的，并确定Zamia姐妹组。Ceratozamia的分子系统发育揭示了三个主要分支，这使得地理解释。最基本的分支表明Ceratozamia在墨西哥东南部的一个可能的祖先地理区域。另一个含义是，该属内的物种形成似乎与更新世后植物群落的扩散有关，这些植物群落来自位于南太平洋的更新世热带避难所。e.墨西哥向北Eje Neovolcanico。通讯编辑：托马斯G. Lammers
Abstract The genus Ceratozamia comprises about 16 species with restricted distribution north and south of the Eje Neovolcanico in Mexico. Phylogenetic relationships were explored among species of Ceratozamia, using 24 exemplars and seven putative outgroup taxa. We examined variation at the molecular level in two non-coding regions from the chloroplast and nuclear genomes. Although the rate of change of the ITS and trnL-F non-coding regions is considered appropriate to recover variation at this taxonomic level, only 33 nucleotide positions were informative out of 2081. Despite low levels of variation, analyses showed that Ceratozamia is monophyletic and identified Zamia as sister group. The molecular phylogeny of Ceratozamia revealed three main clades, which allow for biogeographic interpretations. The most basal clade suggests a probable ancestral geographic area for Ceratozamia in Southeast Mexico. Another implication is that speciation within the genus appears to be associated with the post-Pleistocene spread of floristic communities from proposed Pleistocene tropical refugia located in S. E. Mexico towards north of the Eje Neovolcanico. Communicating Editor: Thomas G. Lammers
DOI：
10.1073/pnas.91.15.6795
发表时间：
1994-07-19
影响因子：
11.1
作者：
CLEGG, MT;GAUT, BS;MORTON, BR
通讯作者：
MORTON, BR