Plastome phylogeny and early diversification of Brassicaceae

BMC Genomics

Research Article

Marcus A. Koch¹  Jianquan Liu²  Kangshan Mao²  Xinyi Guo²  Xiaojuan Wang²  Tao Ma²  Lei Zhang²  Dan Zhang²  Quanjun Hu²  Guoqian Hao³  Ihsan A. Al-Shehbaz⁴ 

[1] Department of Biodiversity and Plant Systematics, Im Neuenheimer Feld 345, Centre for Organismal Studies (COS) Heidelberg, Heidelberg University, 69120, Heidelberg, Germany;MOE Key Laboratory of Bio-Resources and Eco-Environment, College of Life Sciences, Sichuan University, 610065, Chengdu, People’s Republic of China;MOE Key Laboratory of Bio-Resources and Eco-Environment, College of Life Sciences, Sichuan University, 610065, Chengdu, People’s Republic of China;Biodiversity Institute of Mount Emei, Mount Emei Scenic Area Management Committee, 614200, Leshan, Sichuan, People’s Republic of China;Missouri Botanical Garden, PO Box 299, 63166-0299, St. Louis, MO, USA;

关键词: Plastome;    Brassicaceae;    Phylogenomics;    Molecular dating;    Gene loss;   

DOI  :  10.1186/s12864-017-3555-3

 received in 2016-10-23, accepted in 2017-02-03,  发布年份 2017

来源: Springer

【 摘 要 】

BackgroundThe family Brassicaceae encompasses diverse species, many of which have high scientific and economic importance. Early diversifications and phylogenetic relationships between major lineages or clades remain unclear. Here we re-investigate Brassicaceae phylogeny with complete plastomes from 51 species representing all four lineages or 5 of 6 major clades (A, B, C, E and F) as identified in earlier studies.ResultsBayesian and maximum likelihood phylogenetic analyses using a partitioned supermatrix of 77 protein coding genes resulted in nearly identical tree topologies exemplified by highly supported relationships between clades. All four lineages were well identified and interrelationships between them were resolved. The previously defined Clade C was found to be paraphyletic (the genus Megadenia formed a separate lineage), while the remaining clades were monophyletic. Clade E (lineage III) was sister to clades B + C rather than to all core Brassicaceae (clades A + B + C or lineages I + II), as suggested by a previous transcriptome study. Molecular dating based on plastome phylogeny supported the origin of major lineages or clades between late Oligocene and early Miocene, and the following radiative diversification across the family took place within a short timescale. In addition, gene losses in the plastomes occurred multiple times during the evolutionary diversification of the family.ConclusionsPlastome phylogeny illustrates the early diversification of cruciferous species. This phylogeny will facilitate our further understanding of evolution and adaptation of numerous species in the model family Brassicaceae.

【 授权许可】

CC BY   
© The Author(s). 2017