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Acta Horticulturae Sinica ›› 2025, Vol. 52 ›› Issue (9): 2387-2394.doi: 10.16420/j.issn.0513-353x.2024-0563

• Genetic & Breeding·Germplasm Resources·Molecular Biology • Previous Articles     Next Articles

Development of Species-Specific InDel Primers for Magnolia biondii and Their Application in Root Bark Identification

DAI Xiaogang1,*(), LIANG Qingqing1, BI Changwei1,2, WEI Mingchen1, LIU Jingsheng1   

  1. 1 College of Forestry and GrasslandCo-Innovation Center for Sustainable Forestry in Southern China,Key Laboratory of Tree Genetics and Biotechnology of Educational Department of China,State Key Laboratory of Tree Genetics and Breeding,Nanjing Forestry University, Nanjing 210037, China
    2 College of Information Science and Technology & Artificial Intelligence, Nanjing 210037, China
  • Received:2025-05-16 Revised:2025-06-23 Online:2025-09-25 Published:2025-09-24
  • Contact: DAI Xiaogang

Abstract:

As raw materials for extracting parthenolide,the root barks of Magnolia biondii may be adulterated with that of M. denudata. Using these two species as research materials,species-specific InDel markers were identified based on pooled sequencing data. The filtered pooled sequencing data yieled 103.6 and 82.4 Gb of high-quality sequences for M. biondii and M. denudata,respectively. After alignment the filtered reads to the genome of M. biondii,a total of 13 152 interspecific-fixed InDel sites(≥ 5 bp)were detected,and primers were successfully designed for 10 627 of the identified InDels. Two pairs of primers were randomly selected from each of the 19 chromosomes of M. biondii for synthesis. Amplification results showed that 31 primer pairs(81.6%)exhibited universality in M. denudata,with 17 primer pairs displaying length polymorphism between the two species. Further examination by capillary electrophoresis using natural populations of M. biondii and M. denudata revealed that primers Mbi010 and Mbi069 produced species-specific bands with intraspecific conservation and marked interspecific differences. Primer Mbi010 could amplify 120 bp and 115 bp fragments in M. biondii and M. denudata,respectively,while Mbi069 generated 146 bp and 140 bp fragments in respective species. Using these two primer pairs to amplify DNA extracted from mixed root bark samples of M. biondii and M. denudata successfully identified species-specific fragments for each taxon,demonstrating their utility for authenticating of M. biondii root bark adulteration.

Key words: Magnolia biondii, Pool-seq, species-specific primers, root bark, molecular identification