Biotechnology Bulletin ›› 2025, Vol. 41 ›› Issue (6): 229-242.doi: 10.13560/j.cnki.biotech.bull.1985.2025-0005

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Comparative Analysis of Glehnia littoralis from Different Geographic Regions Based on the Characteristics of Chloroplast Genome

AN Chang1(), XU Wen-bo2, LU Lin1, LI Deng-lin1, YAO Yi-xin3, LIN Yan-xiang4, YANG Cheng-zi4, QIN Yuan1(), ZHENG Ping1()   

  1. 1.Center for Genomics, Haixia Institute of Science and Technology, Fujian Agriculture and Forestry University, Fuzhou 350000
    2.School of Traditional Chinese Medicine, China Pharmaceutical University, Nanjing 211198
    3.State Key Laboratory of Quality Research in Chinese Medicine Institute of Chinese Medical Sciences, University of Macau, Macao 999078, China
    4.College of Pharmacy, Fujian University of Traditional Chinese Medicine, Fuzhou 350122
  • Received:2025-01-03 Online:2025-06-26 Published:2025-06-30
  • Contact: QIN Yuan, ZHENG Ping E-mail:ancher0928@163.com;yuanqin@fafu.edu.cn;zhengping13@mails.ucas.ac.cn

Abstract:

Objective This study aims to investigate the characteristics of chloroplast genomes and their phylogenetic relationships across different populations of Glehnia littoralis, with a focus on revealing genetic variation and population differentiation within the species from the perspective of organelle genomes. The findings provide a genetic basis for the breeding of new varieties and the conservation of germplasm resources. Method The chloroplast genome of G. littoralis from Fujian was assembled and annotated. Subsequently, comparative analysis was conducted on the chloroplast genomes of six samples from different geographic regions, examining genomic structure, distribution of repetitive sequences, codon usage preference, nucleotide polymorphism, genomic boundary features, and phylogenetic relationships. The study explores the genetic diversity and adaptive evolution traits among populations from different regions. Result All six chloroplast genomes had a typical double-stranded circular quadripartite structure, with genome lengths ranging from 147 445 bp to 147 552 bp and GC content ranging from 37.51% to 37.52%, demonstrating high structural conservation. A total of 129 genes were annotated, including 85 protein-coding genes, 8 ribosomal RNA genes, and 36 transfer RNA genes. The number of simple sequence repeats (SSRs) ranged from 77 to 79, consisting of six types, predominantly A/T repeats. Codon usage analysis indicated that G. littoralis from Fujian and Taiwan (China) preferentially utilized the CGA codon for arginine, whereas those from Shenzhen and Zhejiang favored CGT. Genomic boundary genes showed a degree of conservation, with differences primarily occurring at the JLB and JLA boundaries. Nucleotide polymorphism analysis identified 12 polymorphic genes and 12 intergenic polymorphic regions. Phylogenetic analysis revealed that the Korean population of G. littoralis was evolutionarily distinct from all other samples, while the Taiwan population diverged earliest, showing unique genetic characteristics. The Fujian population followed in divergence, while the Shenzhen and Zhejiang samples formed a minor clade. Conclusion The chloroplast genome structure of Glehnia littoralis from different regions presents high conservation; however, variations are observed in codon usage, genome boundary regions, and nucleotide polymorphisms. Phylogenetic analysis reveals genetic differentiation among populations, reflecting their adaptive evolutionary characteristics.

Key words: Glehnia littoralis, chloroplast genome, different geographic regions, comparative analysis