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最近形成的多杂种植物以较低的速度多样化.
Itay Mayrose1, Shing H Zhan, Carl J Rothfels
1Biodiversity Research Centre, University of British Columbia, Vancouver, BC V6T 1Z4, Canada. itaymay@post.tau.ac.il
Science (New York, N.Y.)
|August 20, 2011
概括
多重积分,或整个基因组复制,在植物中很常见,但它的进化影响仍在争论中. 这项研究量化地表明,多倍体有较低的物种化和更高的灭绝率,支持进化死胡同假说.
科学领域:
- 进化生物学是进化生物学.
- 植物科学 植物科学
- 基因组学就是基因组学.
背景情况:
- 多重积分 (整个基因组复制) 在植物中很常见,但其宏观进化后果仍在争论中.
- 存在着对比的观点:多倍体性是进化的死胡同,而不是成功的驱动力.
研究的目的:
- 为了研究多体化在血管植物的宏观进化影响.
- 量化评估多化对物种化和灭绝率的影响.
主要方法:
- 分析了各种血管植物中属的时间尺度.
- 利用基于概率的分析来比较多倍体和双倍体之间的比率.
- 推断了数百个多化事件.
主要成果:
- 与二倍体相比,多倍体通常表现出较低的物种化率.
- 多倍体动物表现出比双倍体动物更高的灭绝率.
- 定量证据支持了多倍体育的"进化死胡同"假设.
结论:
- 多体性在数量上与减少物种化和增加灭绝率有关.
- 二倍体动物通过多倍体形成物种的能力有助于它们更高的物种化率.
- 只有高度适应的多倍体血统才能获得长期的进化成功.
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