Construction of a genome-wide SSR marker library in Gerbera hybrida: Insights into genetic variation and germplasm resources

Abstract

Gerbera hybrida is a highly sought-after cut flower globally, renowned for its diverse flower color and pattern resulting from its complex inflorescence meristem architecture. However, the scarcity of genomic information and molecular markers has impeded efforts to comprehend the genetic diversity of G. hybrida. To address this, our study aimed to construct genome-wide simple sequence repeat (SSR) markers in G. hybrida, utilizing genomic data from an inbred line. We employed 170 gerbera cultivars exhibiting distinct flower patterns and colors to analyze genetic variation and diversity. Our analyses revealed highly polymorphic SSR markers, a total of 69 alleles (Na) were amplified by 14 pairs of primers, in which polymorphic information content (PIC) ranging from 0.380 to 0.700 with an average value of 0.583. The polymorphic results of the observed heterozygosity (Ho) and Shannon's information index (I) were 0.499 and 1.195, respectively, showing a high level of genetic diversity within the enriched sequences of the G. hybrida genome. Leveraging these markers with strong differentiation, we successfully constructed a unique fingerprint map encompassing 170 gerbera germplasm lines. This study involved the construction of an SSR fingerprint library for G. hybrida germplasm resources, employing genetic analysis for screening and molecular-level identification. The findings provide valuable insights into the identification of gerbera germplasm resources and kinship studies among various groups. Moreover, this study lays a solid foundation for future advancements in molecular design breeding improvement and germplasm resource development in G. hybrida.