主要的真菌血统来自的共生祖先
1Department of Botany, The Field Museum of Natural History, 1400 South Lake Shore Drive, Chicago, Illinois 60605, USA. flutzoni@fmnh.org
Nature
|June 22, 2001
概括
,共生性真菌协会,比以前认为的更早地进化. 尽管很少获得,但这种共生的多次损失导致了像Aspergillus这样的非形真菌.
科学领域:
- 菌类学 菌类学是指菌类学.
- 进化生物学 进化生物学
- 这种共生是共生.
背景情况:
- 虫是真菌和藻类/蓝藻之间的共生关系,对于真菌的碳水化合物获取至关重要.
- 在Ascomycota phylum中,真菌物种表现出化 (42%) 和非化 (58%) 形式的混合存在.
- 由于高多样性和分类分布,的多个独立起源被广泛假设.
研究的目的:
- 为了研究在阿斯科米科塔.在 lichenization的进化历史.
- 为了确定的进化时间和共生收益和损失的频率.
- 了解非形形成的真菌物种的遗传学起源.
主要方法:
- 对阿斯科米科塔的基因组学比较分析.
- 贝叶斯系遗传树采样方法.
- 特性演变的统计模型,包括遗传学不确定性.
主要成果:
- 在阿斯科米科塔的历史中,类比以前估计的更早地进化.
- lichenization 的收益是不常见的,但发生了多次独立的共生损失.
- 许多完全非状形成的真菌系,包括像Penicillium和Aspergillus这样的人类相关的属,都来自状形成的祖先.
结论:
- 石化化演变的特点是罕见的收益和频繁的损失.
- 了解这些进化动态是理解真菌多样性和重要真菌种群的起源的关键.
- 这项研究重新定义了阿斯科米科塔 (Ascomycota) 内的主要真菌系的进化轨迹.
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