Phylogenetic analysis and divergence time estimation of Lycium species in China based on the chloroplast genomes.

Lycium Comparative analysis Divergence time Phylogenetic relationship Plastome structure

Journal

BMC genomics
ISSN: 1471-2164
Titre abrégé: BMC Genomics
Pays: England
ID NLM: 100965258

Informations de publication

Date de publication:
06 Jun 2024
Historique:
received: 01 03 2024
accepted: 31 05 2024
medline: 7 6 2024
pubmed: 7 6 2024
entrez: 6 6 2024
Statut: epublish

Résumé

Lycium is an economically and ecologically important genus of shrubs, consisting of approximately 70 species distributed worldwide, 15 of which are located in China. Despite the economic and ecological importance of Lycium, its phylogeny, interspecific relationships, and evolutionary history remain relatively unknown. In this study, we constructed a phylogeny and estimated divergence time based on the chloroplast genomes (CPGs) of 15 species, including subspecies, of the genus Lycium from China. We sequenced and annotated 15 CPGs in this study. Comparative analysis of these genomes from these Lycium species revealed a typical quadripartite structure, with a total sequence length ranging from 154,890 to 155,677 base pairs (bp). The CPGs was highly conserved and moderately differentiated. Through annotation, we identified a total of 128-132 genes. Analysis of the boundaries of inverted repeat (IR) regions showed consistent positioning: the junctions of the IRb/LSC region were located in rps19 in all Lycium species, IRb/SSC between the ycf1 and ndhF genes, and SSC/IRa within the ycf1 gene. Sequence variation in the SSC region exceeded that in the IR region. We did not detect major expansions or contractions in the IR region or rearrangements or insertions in the CPGs of the 15 Lycium species. Comparative analyses revealed five hotspot regions in the CPG: trnR(UCU), atpF-atpH, ycf3-trnS(GGA), trnS(GGA), and trnL-UAG, which could potentially serve as molecular markers. In addition, phylogenetic tree construction based on the CPG indicated that the 15 Lycium species formed a monophyletic group and were divided into two typical subbranches and three minor branches. Molecular dating suggested that Lycium diverged from its sister genus approximately 17.7 million years ago (Mya) and species diversification within the Lycium species of China primarily occurred during the recent Pliocene epoch. The divergence time estimation presented in this study will facilitate future research on Lycium, aid in species differentiation, and facilitate diverse investigations into this economically and ecologically important genus.

Sections du résumé

BACKGROUND BACKGROUND
Lycium is an economically and ecologically important genus of shrubs, consisting of approximately 70 species distributed worldwide, 15 of which are located in China. Despite the economic and ecological importance of Lycium, its phylogeny, interspecific relationships, and evolutionary history remain relatively unknown. In this study, we constructed a phylogeny and estimated divergence time based on the chloroplast genomes (CPGs) of 15 species, including subspecies, of the genus Lycium from China.
RESULTS RESULTS
We sequenced and annotated 15 CPGs in this study. Comparative analysis of these genomes from these Lycium species revealed a typical quadripartite structure, with a total sequence length ranging from 154,890 to 155,677 base pairs (bp). The CPGs was highly conserved and moderately differentiated. Through annotation, we identified a total of 128-132 genes. Analysis of the boundaries of inverted repeat (IR) regions showed consistent positioning: the junctions of the IRb/LSC region were located in rps19 in all Lycium species, IRb/SSC between the ycf1 and ndhF genes, and SSC/IRa within the ycf1 gene. Sequence variation in the SSC region exceeded that in the IR region. We did not detect major expansions or contractions in the IR region or rearrangements or insertions in the CPGs of the 15 Lycium species. Comparative analyses revealed five hotspot regions in the CPG: trnR(UCU), atpF-atpH, ycf3-trnS(GGA), trnS(GGA), and trnL-UAG, which could potentially serve as molecular markers. In addition, phylogenetic tree construction based on the CPG indicated that the 15 Lycium species formed a monophyletic group and were divided into two typical subbranches and three minor branches. Molecular dating suggested that Lycium diverged from its sister genus approximately 17.7 million years ago (Mya) and species diversification within the Lycium species of China primarily occurred during the recent Pliocene epoch.
CONCLUSION CONCLUSIONS
The divergence time estimation presented in this study will facilitate future research on Lycium, aid in species differentiation, and facilitate diverse investigations into this economically and ecologically important genus.

Identifiants

pubmed: 38844874
doi: 10.1186/s12864-024-10487-9
pii: 10.1186/s12864-024-10487-9
doi:

Types de publication

Journal Article

Langues

eng

Sous-ensembles de citation

IM

Pagination

569

Subventions

Organisme : the Ningxia Natural Science Foundation
ID : 2022AAC05063
Organisme : the Ningxia Natural Science Foundation
ID : 2021AAC02005
Organisme : the National Natural Science Foundation of China
ID : 32260049

Informations de copyright

© 2024. The Author(s).

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Auteurs

Lei Zhang (L)

Key Laboratory of Ecological Protection of Agro-Pastoral Ecotones in the Yellow River Basin, College of Biological Science & Engineering, National Ethnic Affairs Commission of the People's Republic of China, North Minzu University, Yinchuan, 750021, China.

Erdong Zhang (E)

Key Laboratory of Ecological Protection of Agro-Pastoral Ecotones in the Yellow River Basin, College of Biological Science & Engineering, National Ethnic Affairs Commission of the People's Republic of China, North Minzu University, Yinchuan, 750021, China.

Yuqing Wei (Y)

Key Laboratory of Ecological Protection of Agro-Pastoral Ecotones in the Yellow River Basin, College of Biological Science & Engineering, National Ethnic Affairs Commission of the People's Republic of China, North Minzu University, Yinchuan, 750021, China.

Guoqi Zheng (G)

Key Laboratory of the Ministry of Education for Protection and Utilization of Special Biological Resources in the Western, School of Life Science, Ningxia University, Yinchuan, Ningxia, 750021, China. zhengguoqi1977@163.com.

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