来自三个马卡罗尼西亚群岛的特有Artemisia物种的平行异遗传模式
Daniel Vitales1,2, Carmen Guerrero1, Teresa Garnatje1
1Institut Botànic de Barcelona (IBB), CSIC-Ajuntament de Barcelona, Passeig del Migdia s/n, 08038 Barcelona, Catalonia, Spain.
AoB PLANTS
|August 31, 2023
概括
马卡罗尼西亚的三个相关的岛屿植物物种 (Artemisia) 呈现出平行进化的现象. 它们的有限多样化与最近的相似的进化历史和共同的分散特征有关.
科学领域:
- 进化生物学 进化生物学
- 岛屿生物地理 岛屿生物地理
- 人类遗传学 是一个学科.
背景情况:
- 无基因物种化是岛屿生态系统中一个关键的进化过程,通常被适应辐射所掩盖.
- 马卡罗尼西亚地区的特有 *Artemisia* 种类 (*A. argentea*, *A. thuscula*, *A. gorgonum*) 提供了一个独特的模型来研究独立的异遗传物种化.
- 这些物种每种都局限于一个群岛 (马德拉,加拿大群岛,佛得角),促进了比较进化研究.
研究的目的:
- 在马卡罗尼西亚 *Artemisia* 内的三个独立的异遗传物种化事件中调查共同的进化模式.
- 为了解释这些特有岛屿血统观察到的有限的分类学多样化.
- 分析遗传和细胞遗传数据,揭示共享的进化历史.
主要方法:
- 从全面的岛屿采样中分析了塑和核DNA序列.
- 核DNA量 (基因组大小) 的量化,用于细胞遗传学比较.
- 时间校准的家族遗传重建和哈普型/遗传差异化分析.
主要成果:
- 遗传学分析表明,三种 *Artemisia* 血统的分歧在世时期迅速发生.
- 在这三个群岛中观察到相似的遗传多样性和明确的植物地理结构.
- 与其大陆亲属 (*A. arborescens*) 相比,本土物种表现出较小的基因组大小.
结论:
- 马卡罗尼西亚特有植物 *Artemisia* 的有限物种化可能是平行进化历史的结果.
- 种子分散,花粉运输和息地的共同特征也可能导致限制多样化.
- 最近,独立的进化轨迹解释了马德拉,加拿大群岛和佛得角的类似模式.
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