Plastid phylogenomics and insights into the inter-mountain dispersal of the Eastern African giant senecios (Dendrosenecio, Asteraceae).

Autor: Gichira AW; CAS Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China; Center of Conservation Biology, Core Botanic Gardens, Chinese Academy of Sciences, Wuhan 430074, China; University of Chinese Academy of Sciences, Beijing 100049, China; Sino‑Africa Joint Research Center, Chinese Academy of Sciences, Wuhan 430074, China., Chen L; Center of Conservation Biology, Core Botanic Gardens, Chinese Academy of Sciences, Wuhan 430074, China; Sino‑Africa Joint Research Center, Chinese Academy of Sciences, Wuhan 430074, China., Li Z; CAS Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China; Center of Conservation Biology, Core Botanic Gardens, Chinese Academy of Sciences, Wuhan 430074, China; University of Chinese Academy of Sciences, Beijing 100049, China., Hu G; Center of Conservation Biology, Core Botanic Gardens, Chinese Academy of Sciences, Wuhan 430074, China; Sino‑Africa Joint Research Center, Chinese Academy of Sciences, Wuhan 430074, China., Saina JK; CAS Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China; Center of Conservation Biology, Core Botanic Gardens, Chinese Academy of Sciences, Wuhan 430074, China; University of Chinese Academy of Sciences, Beijing 100049, China; Sino‑Africa Joint Research Center, Chinese Academy of Sciences, Wuhan 430074, China., Gituru RW; Sino‑Africa Joint Research Center, Chinese Academy of Sciences, Wuhan 430074, China; Department of Botany, Jomo Kenyatta University of Agriculture and Technology, 62000-00200 Nairobi, Kenya., Wang Q; Center of Conservation Biology, Core Botanic Gardens, Chinese Academy of Sciences, Wuhan 430074, China; Sino‑Africa Joint Research Center, Chinese Academy of Sciences, Wuhan 430074, China. Electronic address: qfwang@wbgcas.cn., Chen J; CAS Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China; Center of Conservation Biology, Core Botanic Gardens, Chinese Academy of Sciences, Wuhan 430074, China. Electronic address: jmchen@wbgcas.cn.
Jazyk: angličtina
Zdroj: Molecular phylogenetics and evolution [Mol Phylogenet Evol] 2021 Nov; Vol. 164, pp. 107271. Date of Electronic Publication: 2021 Jul 29.
DOI: 10.1016/j.ympev.2021.107271
Abstrakt: 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).
(Copyright © 2021 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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