Contrasting nuclear-plastidial phylogenetic patterns in the recently diverged Iberian Phlomis crinita and P-lychnitis lineages (Lamiaceae)
Contrasting nuclear-plastidial phylogenetic patterns in the recently diverged Iberian Phlomis crinita and P-lychnitis lineages (Lamiaceae)
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DOI：
10.2307/25065483
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发表时间：
2005-11-01
期刊：
影响因子：
3.4
通讯作者：
Feliner, GN
中科院分区：
文献类型：
--
作者：
Albaladejo, RG;Aguilar, JF;Feliner, GN
系统和进化的关系在二倍体西地中海糙苏crinita/剪秋罗复杂仍然存在争议，显然是由于杂交和基因渗入。本研究探讨了核核糖体DNA（ITS区）和三个非编码质体DNA区域（trnH-psbA，trnT-trnL和atpB-rbcL）在这个复杂的序列变异模式，目的是澄清是否杂交，渐渗或谱系排序导致最近的多样化是主要负责知之甚少的关系。从核和叶绿体标记恢复的信息被发现是强烈的不一致。推断核ITS核糖体类型的系统发育分析是一致的，与以前的形态和分类结果区分两个姐妹谱系，P crinita S. L。和P. lychnitis。此外，在ITS序列中检测到的大量的加性多态性表明，复杂的祖先的变异性和基因流的本地模式的共享。与此相反，叶绿体单倍型变异的模式是地理而不是分类，这可能是由低突变率结合频繁的种间杂交的情况。为了整合明显不一致的质体和核的证据，我们认为谱系分选和水平转移都参与其中。即使精确定位的情况下，由于这两种现象是困难的，现有的数据提供了两个姐妹谱系的杂交事件可以确定，尽管遗传的祖先多态性的证据。
Systematic and evolutionary relationships within the diploid Western Mediterranean Phlomis crinita/lychnitis complex remain controversial apparently due to hybridization and introgression. This study examines patterns of sequence variation in the nuclear ribosomal DNA (ITS region) and three non-coding plastid DNA regions (trnH-psbA, trnT-trnL and atpB-rbcL) in this complex in an aim to clarify whether hybridization, introgression or lineage sorting resulting from recent diversification is mainly responsible for poorly understood relationships. Information recovered from nuclear and chloroplast markers was found to be strongly incongruent. Phylogenetic analysis of inferred nuclear ITS ribotypes is consistent with previous morphometric and taxonomic results in distinguishing two sister lineages, P crinita s.l. and P. lychnitis. In addition, the high number of additive polymorphisms detected in ITS sequences suggests the sharing of ancestral variability and local patterns of gene flow within the complex. In contrast, the pattern of chloroplast haplotype variation is geographic rather than taxonomic, which might be caused by low mutation rates combined with frequent instances of interspecific hybridization. To integrate the apparently discordant plastid and nuclear evidence, we suggest that both lineage sorting and horizontal transfer have been involved. Even though pinpointing cases due to either phenomenon is difficult, the available data provide evidence of two sister lineages where hybridization events can be identified despite the inheritance of ancestral polymorphisms.