Plastome phylogenomics of Saussurea (Asteraceae: Cardueae)
Zhang, Xu1,2,3; Deng, Tao3; Moore, Michael J.4; Ji, Yunheng3; Lin, Nan1,2,3; Zhang, Huajie1,2; Meng, Aiping1; Wang, Hengchang1; Sun, Yanxia1; Sun, Hang3
Corresponding AuthorWang, Hengchang( ; Sun, Yanxia( ; Sun, Hang(
Source PublicationBMC PLANT BIOLOGY
AbstractBackgroundSaussurea DC. is one of the largest and most morphologically heterogeneous genera in Asteraceae. The relationships within Saussurea have been poorly resolved, probably due an early, rapid radiation. To examine plastome evolution and resolve backbone relationships within Saussurea, we sequenced the complete plastomes of 17 species representing all four subgenera.ResultsAll Saussurea plastomes shared the gene content and structure of most Asteraceae plastomes. Molecular evolutionary analysis showed most of the plastid protein-coding genes have been under purifying selection. Phylogenomic analyses of 20 Saussurea plastomes that alternatively included nucleotide or amino acid sequences of all protein-coding genes, vs. the nucleotide sequence of the entire plastome, supported the monophyly of Saussurea and identified three clades within it. Three of the four traditional subgenera were recovered as paraphyletic. Seven plastome regions were identified as containing the highest nucleotide variability.ConclusionsOur analyses reveal both the structural conservatism and power of the plastome for resolving relationships in congeneric taxa. It is very likely that differences in topology among data sets is due primarily to differences in numbers of parsimony-informative characters. Our study demonstrates that the current taxonomy of Saussurea is likely based at least partly on convergent morphological character states. Greater taxon sampling will be necessary to explore character evolution and biogeography in the genus. Our results here provide helpful insight into which loci will provide the most phylogenetic signal in Saussurea and Cardueae.
KeywordSaussurea Rapid radiations Plastome Genome Phylogenomic analysis Purifying selection
Indexed BySCI
WOS IDWOS:000474371000001
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Document Type期刊论文
Corresponding AuthorWang, Hengchang; Sun, Yanxia; Sun, Hang
Affiliation1.Chinese Acad Sci, Wuhan Bot Garden, Key Lab Plant Germplasm Enhancement & Specialty A, Wuhan 430074, Hubei, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Kunming Inst Bot, Key Lab Plant Divers & Biogeog East Asia, Kunming 650201, Yunnan, Peoples R China
4.Oberlin Coll, Dept Biol, 119 Woodland St, Oberlin, OH 44074 USA
Recommended Citation
GB/T 7714
Zhang, Xu,Deng, Tao,Moore, Michael J.,et al. Plastome phylogenomics of Saussurea (Asteraceae: Cardueae)[J]. BMC PLANT BIOLOGY,2019,19:10.
APA Zhang, Xu.,Deng, Tao.,Moore, Michael J..,Ji, Yunheng.,Lin, Nan.,...&Sun, Hang.(2019).Plastome phylogenomics of Saussurea (Asteraceae: Cardueae).BMC PLANT BIOLOGY,19,10.
MLA Zhang, Xu,et al."Plastome phylogenomics of Saussurea (Asteraceae: Cardueae)".BMC PLANT BIOLOGY 19(2019):10.
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