在Archaeplastida中多细胞化的冷起源
Alexander M C Bowles1,2, Christopher J Williamson1, Tom A Williams2
1School of Geographical Sciences, University of Bristol, Bristol BS8 1SS, UK.
Genome biology and evolution
|February 9, 2024
概括
在冷时期的全球冰川可能刺激了Archaeplastida和第一个陆地植物的多细胞性进化. 这项研究为早期植物生命建立了新的进化时间表.
科学领域:
- 进化生物学 进化生物学
- 古生物学的古生物学
- 分子遗传学分子遗传学
背景情况:
- 低温时期 (720-635万年前) 出现了全球冰川,可能影响了早期生命的演化.
- 由于数据有限,Archaeplastida内部的进化时间表和关系,特别是关于多细胞性和陆地植物起源,仍然不太清楚.
研究的目的:
- 为了推断早期古塑体进化的时间校准的类型学.
- 调查冷时期冰川和多细胞和陆地植物的出现之间的时间关系.
主要方法:
- 使用修订后的分子数据集进行遗传学分析.
- 重新评估化石记录以确定进化时间表.
- 采用了家族遗传拓测试和分子时钟分析.
- 执行了细胞形态特征的祖先状态重建.
主要成果:
- 解决了深层的古原塑关系,确定了两个Viridiplantae的分类.
- 推断出Archaeplastida的起源是在古新生代晚期到中新生代早期 (1712-1387万年).
- 在Archaeplastida中显示出多细胞的独立起源,许多发生在冷时代.
- 确定多细胞罗多植物 (902-655万年前) 和冠状无水植物 (796-671万年前) 的出现日期.
结论:
- 阿基普拉斯蒂达 (Archaeplastida) 的进化时间树与冷时期保持一致.
- 这些发现支持了冷生物多细胞性假设和"雪球地球"事件在植物进化中的作用.
- 早期植物进化的时间与冷植物地球化假设在很大程度上兼容.
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