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Acta Horticulturae Sinica ›› 2024, Vol. 51 ›› Issue (6): 1227-1240.doi: 10.16420/j.issn.0513-353x.2023-0444

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

Using the Fluorescent Labeled SSR Markers to Establish Molecular Identity of Hawthorn

QIN Yu1,2, GUO Rongkun3, NONG Huilan3, WANG Yan3, CUI Kai1,*(), DONG Ningguang3,*()   

  1. 1 Institute of Highland Forest Science,Chinese Academy of Forestry,Kunming 650223,China
    2 College of Forestry,Nanjing Forestry University,Nanjing 210037,China
    3 Beijing Engineering Research Center for Deciduous Fruit Trees,Key Laboratory of Biology and Genetic Improvement of Horticultural Crops(North China),Ministry of Agriculture and Rural Affairs,Institute of Forestry and Pomology,Beijing Academy of Agriculture and Forestry Sciences,Beijing 100093,China
  • Received:2023-12-08 Revised:2024-03-19 Online:2024-12-19 Published:2024-06-21
  • Contact: CUI Kai, DONG Ningguang

Abstract:

In present research,simple sequence repeats(SSR)markers were employed to analyze the genetic diversity and to establish the molecular identity of 91 hawthorn accessions. Ninety-six pairs of SSR primers were developed from the hawthorn genome database,and 12 pairs with good polymorphism were selected. The screened primers were labeled with four kinds of fluorescence and used for PCR amplification. The PCR products of the 91 samples were analyzed by capillary electrophoresis. The GeneMarker analysis software was used to determine the sizes of the amplified fragments and the genotypes. The individual digits and uppercase English letters were used to mark each band to encode a fingerprint. According to the polymorphic information content(PIC)of 12 primers,the order of these primer pairs were sorted from high to low,and molecular identities of 91 hawthorn accessions were established. Cluster analysis of 91 hawthorn accessions were performed using the Unweighted pair-group method with arithmetic means(UPGMA). The results showed that a total of 67 alleles were detected from 12 pairs of SSR primers,with an average of 5.583 alleles per each primers and an average of 2.730 effective alleles. The mean values of observed heterozygosity(Ho),expected heterozygosity(He),Shannon’s information index(I),and polymorphic information content(PIC)were 0.490,0.593,1.195,and 0.551(range 0.300-0.715),respectively. The genetic similarity coefficient of 91 hawthorn accessions ranged from 0.25 to 0.98 with an average of 0.529,and the samples could be classified into five groups at the genetic similarity coefficient of 0.46. The molecular identities of the 91 hawthorn accessions were constructed through the selection of primers according to its PIC,these accessions could be distinguished by the least specific primers. This study could provide reliable basis for the identification,evaluation,utilization,and genetic relationship analysis of hawthorn germplasm resources.

Key words: hawthorn, germplasm resources, fluorescent labeled SSR marker, molecular identity