双胞胎物种的原生和进化网络表明,Tethys海岸的Ephedra早期辐射
相关实验视频
Updated: Jul 13, 2025
07:37
Resurrection of Dormant Daphnia magna: Protocol and Applications
Published on: January 19, 2018
18.4K
Qiong Yu1,2,3, Fu-Sheng Yang1,2,3, Ya-Xing Chen1
1State Key Laboratory of Plant Diversity and Specialty Crops, Institute of Botany, the Chinese Academy of Sciences, Beijing, 100093, China.
Journal of integrative plant biology
|October 14, 2023
概括
由于其庞大的基因组和多倍体,重建Ephedra属的原型是具有挑战性的. 这项研究揭示了复杂的网状细胞进化和普遍的全聚类物种,表明古代起源和特定的分散模式.
科学领域:
- 植物学和进化生物学
- 人类遗传学和生物地理学
- 基因组学和物种化研究
背景情况:
- 运动精子属Ephedra因其庞大的基因组大小和多重多的流行而对遗传学重建提出了重大挑战.
- 了解Ephedra的进化历史和生物地理模式对于理解干旱和半干旱环境中的植物进化至关重要.
研究的目的:
- 使用转录组数据重建Ephedra的一种强大的物种类型.
- 为了研究复杂的进化网络,包括基因流和全聚类物种化,在属内.
- 推断Ephedra的起源和生物地理历史,特别是南美物种.
主要方法:
- 使用转录组数据对19个双胞胎Ephedra物种进行了家族遗传学分析.
- 纳入50个双倍体和多倍体物种,分析了4个低复制核和9个塑基因.
- 重建单基因树来评估基因冲突和基因流动.
主要成果:
- 双胞胎分化表明地中海物种首先分离,然后分裂成美国 (A类),E. rhytidosperma和亚洲 (B类) 类.
- 单基因树表明早期的辐射和基因流动,其中E. rhytidosperma显示了模两可的基因分布.
- 在包括南美物种在内的深度和近期分歧中观察到有网状物种的进化,而全聚类物种化很普遍.
结论:
- 埃菲德拉可能起源于白纪晚期的泰提斯海岸.
- 复杂的网状进化和普遍的全聚化挑战了传统的遗传学方法,但却揭示了该属的进化动态.
- 南美洲的Ephedra物种很可能起源于从北美单一的分散事件.
相关概念视频
01:23Phylogeny
44.2K
Phylogeny is concerned with the evolutionary diversification of organisms or groups of organisms. A group of organisms with a name is called a taxon (singular). Taxa (plural) can span different levels of the evolutionary hierarchy. For instance, the group containing all birds is a taxon (comprising the class Aves), and the group of all species of daisies (the genus Bellis) is a taxon. Phylogenies can likewise include just one genus (i.e., depict species relationships) or span an entire kingdom.
44.2K
01:31Formation of Species
39.3K
Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.
39.3K
01:22Role of Ephrin-Eph Signalling in Intestinal Stem Cell Renewal
2.2K
Erythropoietin-producing hepatocellular carcinoma receptor (Eph) and its ligand, Eph receptor-interacting protein (Ephrin) were first discovered in the human carcinoma cell line, hence the name. Ephrin-Eph interaction guides cells to reach their appropriate location in adult tissues. They also play an essential role in the immune system by helping in immune cell migration, adhesion, and activation. Based on their structure and function, Eph is divided into two classes — EphA and EphB.
2.2K
03:21Phylogenetic Trees
45.4K
Phylogenetic trees come in many forms. It matters in which sequence the organisms are arranged from the bottom to the top of the tree, but the branches can rotate at their nodes without altering the information. The lines connecting individual nodes can be straight, angled, or even curved.
45.4K
02:35What is Evolutionary History?
36.5K
Scientists record evolutionary history by analyzing fossil, morphological, and genetic data. The fossil record documents the history of life on Earth and provides evidence for evolution. However, both fossil and living organisms offer evidence that outlines Earth’s evolutionary history.
36.5K
01:07Speciation Rates
21.2K
Overview
21.2K