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Acta Horticulturae Sinica ›› 2025, Vol. 52 ›› Issue (2): 380-394.doi: 10.16420/j.issn.0513-353x.2024-0158

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

Genetic Diversity Analysis and SSR Fingerprint Construction of Evergreen Rhododendron Germplasms

ZHANG Lu1, ZHANG Pingping2, XIE Weijia1, XU Feng1, PENG Lüchun1, SONG Jie1, DU Guanghui2,*(), LI Shifeng1,*()   

  1. 1 National Engineering Research Center for Ornamental Horticulture,Key Laboratory of Flower Breeding of Yunnan Province,Flower Research Institute of Yunnan Academy of Agricultural Sciencese,Kunming 650205,China
    2 Resource Plant Research Institute,Yunnan University,Kunming 650504,China
  • Received:2024-05-22 Revised:2024-11-07 Online:2025-02-25 Published:2025-02-23
  • Contact: DU Guanghui, LI Shifeng

Abstract:

In this study,based on genomic sequencing data of Rhododendron delavayi Franch.,genomic-SSR distribution characteristics were analyzed and polymorphic SSR primers were developed. Furthermore,the 61 evergreen Rhododendron germplasms were analyzed for genetic relationship and fingerprint construction to realize their genetic relationships and speculate their possible parents. In the results,15 pairs of SSR primers with high polymorphism,good stability and strong intergeneric versatility were developed,and a total of 126 alleles were detected in 61 evergreen Rhododendron germplasms. The average number of alleles(Na)and the average effective number of alleles(Ne)were 8.400 and 3.4681,respectively. The mean observed heterozygosity(Ho)and expected heterozygosity(He)were 0.3421 and 0.5347,respectively,and the mean polymorphism information content(PIC)was 0.5163. According to the results of population genetic structure analysis,61 evergreen Rhododendron germplasms were divided into 3 subgroups,which were basically consistent with the results of phylogenetic analysis. Combined with the pedigree information,it was inferred that the ancestral parents of the introduced Japanese cultivars came from two different distribution areas,and all cultivars,including the self-bred cultivars,were the hybrids of the parental species from sect. Ponticum in subgen. Hymenanthes. Five SSR markers with high discriminability were used to construct the fingerprint of 61 evergreen Rhododendron germplasms successfully.

Key words: evergreen rhododendron, genomic SSR markers, genetic diversity, fingerprints