Adaptive evolution of rbcL in Conocephalum (Hepaticae, bryophytes)
Adaptive evolution of rbcL in Conocephalum (Hepaticae, bryophytes)
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DOI：
10.1016/j.gene.2008.11.020
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发表时间：
2009-07-15
期刊：
影响因子：
3.5
通讯作者：
Murakami, Noriaki
中科院分区：
文献类型：
--
作者：
Miwa, Hidetsugu;Odrzykoski, Ireneusz J.;Murakami, Noriaki
在分子水平上，非同义替换多于同义替换被认为是适应进化或正选择的重要指标。我们现在报告这样的情况下，rbcL序列在Conocephalum（肝科，苔藓植物）的隐种。这一发现可被视为该属内几种隐种（特别是F型和JN型）适应性进化的证据。苔藓植物是一种形态简单的小型陆地植物。因此，我们可以预期在每个形态物种中存在几个生物学上不同的单位或隐种。在我们之前的研究中，我们发现了三种rbcL类型的亚洲Conocephalum japonicum （Thunb.）。Grolle和他的同事还发现了强有力的证据，表明这三种类型是生殖隔离的隐种。此外，我们还研究了6个隐种C conicum (L) Dumort的rbcL序列变异。先前被同酶分析发现。结果，我们能够仅根据它们的rbcL序列来区分6个隐种。我们能够证明rbcL序列的变异也有助于寻找隐种。(C) 2008 Elsevier B.V.版权所有
An excess of nonsynonymous substitutions over synonymous ones has been regarded as an important indicator of adaptive evolution or positive selection at the molecular level. We now report such a case for rbcL sequences among cryptic species in Conocephalum (Hepaticae, Bryophytes). This finding can be regarded as evidence of adaptive evolution in several cryptic species (especially in F and JN types) within the genus.Bryophytes are small land plants with simple morphology. We can therefore expect the existence of several biologically distinct units or cryptic species within each morphological species. In our previous study, we found three rbcL types in Asian Conocephalum japonicum (Thunb.) Grolle and also found evidence strongly suggesting that the three types are reproductively isolated cryptic species. Additionally, we examined rbcL sequence variation in six cryptic species of C conicum (L) Dumort. previously recognized by allozyme analyses. As a result, we were able to discriminate the six cryptic species based only on their rbcL sequences. We were able to show that rbcL sequence variation is also useful in finding cryptic species of C conicum. (C) 2008 Elsevier B.V. All rights reserved.