Phylogenomics of the hyperdiverse daisy tribes: Anthemideae, Astereae, Calenduleae, Gnaphalieae, and Senecioneae
Phylogenomics of the hyperdiverse daisy tribes: Anthemideae, Astereae, Calenduleae, Gnaphalieae, and Senecioneae
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DOI：
10.1111/jse.12698
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发表时间：
2020-12-14
影响因子：
3.7
通讯作者：
Mandel, Jennifer
中科院分区：
文献类型：
--
作者：
Watson, Linda E.;Siniscalchi, Carolina M.;Mandel, Jennifer
菊科占所有开花植物物种的10%，其中35%-40%属于五个密切相关的部落，总计超过10000种。这些族包括春黄菊族、紫菀族、金盏花族、鼠曲草族和千里光族，它们形成了紫菀亚科中两个巨大的分支之一。我们采用了一种基因组学方法来解决这五个部落之间的进化关系。我们通过HybSeq靶标富集和基因组略读对核和质体基因组进行了采样，并回收了74个质体基因和近1000个核基因座，称为保守的正向序列。我们在两个数据集中测试了相互矛盾的支持，并使用网络分析来评估网状结构的模式，以解释这个谱系的早期进化史，它经历了全基因组复制和快速辐射。我们发现在这两个数据集的一致性和相互冲突的支持，并记录了四个古老的杂交事件。由于这五个部落谱系的早期辐射时间，在始新世-渐新世灭绝事件（3400万年）之前不久，早期谱系可能已经丢失，模糊了他们早期进化历史的一些细节。
Asteraceae account for 10% of all flowering plant species, and 35%-40% of these are in five closely related tribes that total over 10 000 species. These tribes include Anthemideae, Astereae, Calenduleae, Gnaphalieae, and Senecioneae, which form one of two enormous clades within Subfamily Asteroideae. We took a phylogenomics approach to resolve evolutionary relationships among these five tribes. We sampled the nuclear and plastid genomes via HybSeq target enrichment and genome skimming, and recovered 74 plastid genes and nearly 1000 nuclear loci, known as Conserved Orthologous Sequences. We tested for conflicting support in both data sets and used network analyses to assess patterns of reticulation to explain the early evolutionary history of this lineage, which has experienced whole-genome duplications and rapid radiations. We found concordance and conflicting support in both data sets and documented four ancient hybridization events. Due to the timing of the early radiation of this five-tribe lineage, shortly before the Eocene-Oligocene extinction event (34 MYA), early lineages were likely lost, obscuring some details of their early evolutionary history.