古代侵入的回声在无花果的进化过程中突破了稳定的基因组血统
Elliot M Gardner1,2,3, Sam Bruun-Lund4, Matti Niissalo3
1International Center for Tropical Botany at the Kampong, Institute of Environment, Florida International University, Miami, FL 33133.
概括
无花果树的进化揭示了稳定的血统,偶尔会发生局部杂交,这是由授粉者共享驱动的. 尽管有杂交潜力,但强制性植物授粉者关系限制了不同无花果物种之间的广泛侵入.
科学领域:
- 进化生物学 进化生物学
- 植物系统学 植物系统学
- 人类基因组学是什么?
背景情况:
- 开花植物的进化传统上强调授粉者特异性作为关键的隔离机制.
- 最近的研究表明,侵入性杂交起到了作用,授粉者专业化并不总是完全的障碍.
- 无花果树 (Ficus) 和它们的专业黄蜂 (Agaonidae) 代表了研究编码多样化和潜在杂交的模型系统.
研究的目的:
- 在多样化的无花果树类 (摩拉属) 中研究内进和生殖隔离之间的相互作用.
- 为Ficus构建一个强大的基因组骨干,结合密集的分类型采样.
- 评估Ficus物种内内入的历史流行和驱动因素.
主要方法:
- 采用了密集的分类型采样,分析了520个Ficus物种.
- 利用了1751个遗传位点的族群基因组分析.
- 在整个Ficus历史中调查了家族遗传关系和内进模式.
主要成果:
- 为Ficus生成了一个完善的基因组骨干,支持更新的分类.
- 揭示了家族遗传学上在血统内稳定的进化,偶尔会出现局部侵入事件.
- 已识别的细胞质内侵入的实例在很大程度上受到随后的核基因组忠诚度的限制,通常由本地授粉者共享介导.
结论:
- 杂交是Ficus的一个重要的进化过程,通常是由授粉者共享促进的.
- 强制性的植物-授粉者关系起到重要的障碍作用,防止远距离的谱系之间广泛的内入侵.
- 菲克斯的进化历史表明,局部杂交不一定会导致整个类的持续内进.
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