潘达努斯塑体解码:当气候反映形态学和遗传学关系时
John M A Wojahn1, Martin W Callmander2, Sven Buerki1
1Department of Biological Sciences, Boise State University, 1910 University Drive, Boise, 83725, ID, USA.
American journal of botany
|January 31, 2025
概括
潘达努斯的分类学揭示了两个分类和四个分类,只有科罗纳塔亚属是单ophyletic. 叶子储水组织是与气候适应和该属的进化有关的关键特征.
科学领域:
- 植物学 植物学
- 进化生物学 进化生物学
- 人类遗传学 是一个学科.
背景情况:
- 潘达努斯 (Pandanaceae) 是古热带单一植物的一种多样化属.
- 以往使用有限DNA区域的遗传学研究对于Pandanus subgenera的单属没有得出结论.
- 遗传学分支的低支持阻碍了详细的进化研究.
研究的目的:
- 使用全面的基因组数据测试Pandanus亚属的单.
- 为了在Pandanus群体中识别形态上的协同形态 (共享的衍生性质).
- 研究叶子解剖学,特别是储水组织与气候差异化之间的关系.
- 为了重建Pandanus属的时空进化历史.
主要方法:
- 基因组脱皮被用来测序50种潘达努斯物种,重建它们的塑体.
- 用分区的RAxML和BEAST分析推断了家族遗传树,以测试亚基类单和执行祖先状态重建.
- 西莫代拉-哈塞加瓦测试被用于单类的测试.
- 随机森林被用来比较整个家族遗传学群的气候和土壤条件.
- 分析了当前形态,气候利基和过去气候事件之间的相关性.
主要成果:
- 遗传学分析在Pandanus中确定了两个主要类和四个子类.
- 只有科罗纳塔亚属被发现是单体的.
- 在三个亚分类中,确定了形态上的协同形态,特别是在支柱状结构中.
- 过度缩和过度形成的储水组织被确定为II类的synapomorphy,与季节性气候和排水良好的土壤有关.
- 克莱德分化发生在早期的米奥森,与东南亚季风相吻合,而子克莱德在米奥森热量最大时分离.
结论:
- 目前Pandanus的亚属分类需要根据遗传学发现进行修订.
- 过度缩和过度形成的储水组织的进化是Pandanus适应的一个关键因素.
- 这一关键特征很可能通过使水力压力下的光合作用能够解释观察到的气候和生物地理模式.
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