Abstract Detail


Liu, Jing [1], Ren, Chen [2], Wen, Jun [3].

Phylogenomics of Aralia sect. Aralia (Araliaceae): insights into its species delimitations and diversification in eastern Asia.

Aralia sect. Aralia is a small lineage (14 spp.) of Araliaceae with a disjunct distribution between eastern Asia (11 spp.) and North America (3 spp.), and shows strong endemism in major biogeographic regions in eastern Asia. We herein employed sequences of 766 nuclear loci and the complete plastomes using targeted sequence capture and genome skimming to reconstruct the phylogeny of this section. Concatenation and coalescent methods were used to construct the nuclear phylogeny, and maximum likelihood and Bayesisan inference were used to infer plastome trees. Within Aralia sect. Aralia, different analytical strategies generated largely congruent topologies from the nuclear data, yet significant cytonuclear conflict was detected concerning the position of the three North American species. The section shows two intercontinental disjunctions with Aralia californica of western North America sister to the eastern Asian clade consisting of A. cordata and A. continentalis in the nuclear tree, and the eastern North American A. racemosa is strongly supported to be sister to A. bicrenata from southwestern North America, and the A. racemosa - A. bicrenata clade is sister to the eastern Asian clade consisting of A. glabra (Japan), A. fargesii (C China), and A. apioides and A. atropurpurea (the Hengduan Mountains). The results support the close biogeographic relationship between Japan and China, as showcased by the newly defined A. cordata that is disjunctly distributed in Japan, Taiwan, the Ulleung island of Korea, and in Central, Southwest and South China. Aralia continentalis is redefined with a narrower distribution in Northeast China, eastern Russia and peninsular Korea. 

1 - Sichuan Agricultural University, College of Life Science, Chengdu, Sichuan, 625014, China
2 - Such China Botanical Garden, Chinese Academy of Sciences, Guangzhou, Guangdong, 510650, China
3 - Smithsonian Institution, Botany, National Museum of Natural History, Washington, D.C., 20013-7012, USA

eastern Asian - North American disjunction.

Presentation Type: Oral Paper
Session: PHYL3, Phylogenomics III
Location: Virtual/Virtual
Date: Friday, July 31st, 2020
Time: 11:30 AM
Number: PHYL3007
Abstract ID:745
Candidate for Awards:None

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