Deciphering complex reticulate evolution of Asian Buddleja (Scrophulariaceae): insights into the taxonomy and speciation of polyploid taxa in the Sino-Himalayan region

doi:10.1093/aob/mcad022

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	Deciphering complex reticulate evolution of Asian Buddleja (Scrophulariaceae): insights into the taxonomy and speciation of polyploid taxa in the Sino-Himalayan region
	Yang,Fengmao; Ge,Jia; Guo,Yongjie; Olmstead,Richard; Sun,Weibang
	2023
发表期刊	ANNALS OF BOTANY
ISSN	1095-8290
摘要	Background and Aims Species of the genus Buddleja in Asia are mainly distributed in the Sino-Himalayan region and form a challenging taxonomic group, with extensive hybridization and polyploidization. A phylogenetic approach to unravelling the history of reticulation in this lineage will deepen our understanding of the speciation in biodiversity hotspots. Methods For this study, we obtained 80 accessions representing all the species in the Asian Buddleja clade, and the ploidy level of each taxon was determined by flow cytometry analyses. Whole plastid genomes, nuclear ribosomal DNA, single nucleotide polymorphisms and a large number of low-copy nuclear genes assembled from genome skimming data were used to investigate the reticulate evolutionary history of Asian Buddleja. Complex cytonuclear conflicts were detected through a comparison of plastid and species trees. Gene tree incongruence was also analysed to detect any reticulate events in the history of this lineage. Key Results Six hybridization events were detected, which are able to explain the cytonuclear conflict in Asian Buddleja. Furthermore, PhyloNet analysis combining species ploidy data indicated several allopolyploid speciation events. A strongly supported species tree inferred from a large number of low-copy nuclear genes not only corrected some earlier misinterpretations, but also indicated that there are many Asian Buddleja species that have been lumped mistakenly. Divergent time estimation shows two periods of rapid diversification (8-10 and 0-3 Mya) in the Asian Buddleja clade, which might coincide with the final uplift of the Hengduan Mountains and Quaternary climate fluctuations, respectively. Conclusions This study presents a well-supported phylogenetic backbone for the Asian Buddleja species, elucidates their complex and reticulate evolutionary history and suggests that tectonic activity, climate fluctuations, polyploidization and hybridization together promoted the diversification of this lineage.
关键词	Buddleja phylogenomics reticulate evolution polyploidy plastid genome low-copy nuclear gene HYBRIDIZATION ALIGNMENT DIVERSIFICATION ALLOPOLYPLOIDY PHYLOGENETICS FRAMEWORK NUCLEAR ROBUST FLOW
学科领域	Plant Sciences
DOI	10.1093/aob/mcad022
WOS记录号	WOS:000945929800001
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/74890
专题	中国科学院昆明植物研究所
推荐引用方式 GB/T 7714	Yang,Fengmao,Ge,Jia,Guo,Yongjie,et al. Deciphering complex reticulate evolution of Asian Buddleja (Scrophulariaceae): insights into the taxonomy and speciation of polyploid taxa in the Sino-Himalayan region[J]. ANNALS OF BOTANY,2023.
APA	Yang,Fengmao,Ge,Jia,Guo,Yongjie,Olmstead,Richard,&Sun,Weibang.(2023).Deciphering complex reticulate evolution of Asian Buddleja (Scrophulariaceae): insights into the taxonomy and speciation of polyploid taxa in the Sino-Himalayan region.ANNALS OF BOTANY.
MLA	Yang,Fengmao,et al."Deciphering complex reticulate evolution of Asian Buddleja (Scrophulariaceae): insights into the taxonomy and speciation of polyploid taxa in the Sino-Himalayan region".ANNALS OF BOTANY (2023).

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