目标序列捕获提供了Lasiopetaleae (Malvaceae) 部落的通用界限和杂交
Benjamin M Anderson1, Todd G B McLay2, Carolyn F Wilkins1
1Western Australian Herbarium, Biodiversity and Conservation Science, Department of Biodiversity, Conservation and Attractions, Bentley 6983 WA, Australia.
Molecular phylogenetics and evolution
|August 24, 2025
概括
遗传学分析显示,Lasiopetaleae部落中的当前属性是偏生态的,它们之间发生杂交. 分类学修订可能涉及扩展现有的属或建立新的属.
科学领域:
- 植物学
- 植物系统学
- 分子遗传学
背景情况:
- 科 (Malvaceae亚系Byttnerioideae) 包含主要在澳大利亚发现的九个属.
- 之前的遗传学研究在解决该部落内部的关系方面遇到了挑战,特别是与Lasiopetalum相关的属.
- 历史上的分类不稳定性,以及频繁的物种重新分类,使得通用界限的理解变得复杂.
研究的目的:
- 澄清基因界限并确定与Lasiopetalum结盟的基因系在Lasiopetaleae部落.
- 使用先进的基因组技术,研究属内和属间的杂交情况.
- 根据新的遗传学证据,为Lasiopetaleae部落提出分类学修订.
主要方法:
- 在Guichenotia,Lasiopetalum,Lysiosepalum和Thomasia中为8个属的144个样本生成的目标序列捕获数据.
- 使用HybPiper和SECAPR组装388个核位点,然后进行连接和凝聚性基因分析.
- 使用HybPhaser调查潜在的杂交并分析异位.
主要成果:
- 研究组中的当前属属是类遗传的,表明非单一的进化血统.
- 在检查的两种属之间都发现了杂交的证据.
- 脊柱关系的低基因一致性表明基因树估计错误,分类不稳定性和不完整的血统排序.
结论:
- 尽管存在遗传学上的分歧和杂交,但仍能识别出形态上可识别的基因组分类.
- 分类学修订是必要的,潜在的解决方案包括现有属的实质性扩展或新属的建立.
- 解决类属性可能涉及将大约108种类纳入几个扩展的属或恢复/识别新属.
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