Providing a phylogenetic framework for trait-based analyses in brown algae: Phylogenomic tree inferred from 32 nuclear protein-coding sequences
Providing a phylogenetic framework for trait-based analyses in brown algae: Phylogenomic tree inferred from 32 nuclear protein-coding sequences
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DOI：
10.1016/j.ympev.2022.107408
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发表时间：
2022-01-20
影响因子：
4.1
通讯作者：
Kawai，Hiroshi
中科院分区：
文献类型：
--
作者：
Akita，Shingo;Vieira，Christophe;Kawai，Hiroshi
在生物复杂性进化的研究中，需要一个可靠的系统发育框架。基于分子证据，人们做出了许多尝试来解决褐藻（褐藻纲）高等类群（即序间）之间的系统发育关系，但大多数关系仍不清楚。基于小型多基因数据（包括叶绿体、线粒体和核序列）的分析得出了不确定的、有时甚至是矛盾的结果。为了解决这个问题，我们分析了属于 8 个目的 39 种褐藻的 32 个核蛋白编码序列。由此产生的基于核的系统发育树几乎为所研究的分类单元内的系统发育关系提供了完全支持，几乎没有例外。这些关系在很大程度上证实了基于核、叶绿体和线粒体序列的系统发育树，除了具有弱引导支持的球菌目的放置之外。我们的研究表明，核蛋白编码序列为最终解决褐藻纲之间的系统发育关系提供了重要支持，并且可能是通过增加分类单元采样来完全解决序间关系的有效方法。
In the study of the evolution of biological complexity, a reliable phylogenetic framework is needed. Many attempts have been made to resolve phylogenetic relationships between higher groups (i.e., interordinal) of brown algae (Phaeophyceae) based on molecular evidence, but most of these relationships remain unclear. Analyses based on small multi-gene data (including chloroplast, mitochondrial and nuclear sequences) have yielded inconclusive and sometimes contradictory results. To address this problem, we have analyzed 32 nuclear protein-coding sequences in 39 Phaeophycean species belonging to eight orders. The resulting nuclear-based phylogenomic trees provide virtually full support for the phylogenetic relationships within the studied taxa, with few exceptions. The relationships largely confirm phylogenetic trees based on nuclear, chloroplast and mitochondrial sequences, except for the placement of the Sphacelariales with weak bootstrap support. Our study indicates that nuclear protein-coding sequences provide significant support to conclusively resolve phylogenetic relationships among Phaeophyceae, and may be a powerful approach to fully resolve interordinal relationships with increased taxon sampling.