期刊
MOLECULAR PHYLOGENETICS AND EVOLUTION
卷 164, 期 -, 页码 -出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ympev.2021.107271
关键词
Biogeography; Chloroplast genome; Dendrosenecio; Divergence time; Giant senecios; Niche model
资金
- Sino-Africa Joint Research Center [Y323771W07, SAJC201322]
- National Natural Science Foundation of China [31670226]
- International Partnership Program of Chinese Academy of Sciences [151853KYSB20190027]
- CAS-TWAS President's Fellowship Program
This study analyzed the phylogeny of giant senecios using whole chloroplast genome sequences and estimated their ancestral areas and predicted suitable habitats. Results suggest a recent divergence time and rapid radiation of the plant group from Northern Tanzania to Kenyan and Ugandan mountains within the past one million years.
Giant senecios (Dendrosenecio, Asteraceae), endemic to the tropical mountains of Eastern Africa, are one of the most conspicuous alpine plant groups in the world. Although the group has received substantial attention from researchers, its infrageneric relationships are contentious, and the speciation history remains poorly understood. In this study, whole chloroplast genome sequences of 46 individuals were used to reconstruct the phylogeny of giant senecios using Maximum Likelihood and Bayesian Inference methods. The divergence times of this emblematic group were estimated using fossil-based calibrations. Additionally, the ancestral areas were inferred, and ecological niche modeling was used to predict their suitable habitats. Phylogenetic analyses yielded two robustly supported clades. One clade included taxa sampled from Tanzania, while the other clade included species from other regions. Giant senecios likely originated from the North of Tanzania approximately 2.3 million years ago (highest posterior density 95%; 0.77-4.40), then rapidly radiated into the Kenyan and Ugandan mountains within the last one million years. The potential routes of dispersal have been proposed based on the inferred ancestral areas, estimated time, and predicted past suitable niches. Plio-Pleistocene climate oscillations and orogeny instigated early divergence of the genus. Whereas in situ radiation of giant senecios was chiefly driven by multiple long-distance dispersal events followed by episodes of vicariance, and allopatric speciation (geographic and/or altitudinal).
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据