ArticleAnnals of botany2025
Repeatome landscapes and cytogenetics of hortensias provide a framework to trace Hydrangea evolution and domestication.
Article in Annals of botany, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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4 citing papers in PubMed.
- From minor loci to major players? Satellite DNA diversification in Crepis sensu stricto.Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology · 2025Article
- Integration of Repeatome and Cytogenetic Data on Tandem DNAs in a Medicinal PlantInternational journal of molecular sciences · 2025Article
- Diverging repeatomes in holoparasitic Hydnoraceae uncover a playground of genome evolution.The New phytologist · 2025Article
- Thriving or Withering? Plant Molecular Cytogenetics in the First Quarter of the 21st Century.International journal of molecular sciences · 2025Review
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Abstract
BACKGROUND AND
aimsOrnamental hortensias are bred from a reservoir of over 200 species in the genus Hydrangea s.l. (Hydrangeaceae), and are valued in gardens, households and landscapes across the globe. The phenotypic diversity of hortensia cultivars, hybrids and wild relatives is mirrored by their genomic variation, with differences in genome size, base chromosome numbers and ploidy level. We aim to understand the genomic and chromosomal basis of hortensia genome variation. Therefore, we analysed six hortensias with different origins and chromosomal setups for repeatome divergence, the genome fraction with the highest sequence turnover. This holds information from the hortensias' evolutionary paths and can guide breeding initiatives.
methodsWe compiled a hortensia genotype panel representing members of the sections Macrophyllae, Hydrangea, Asperae and Heteromallae and reconstructed a plastome-based phylogenetic hypothesis as the evolutionary basis for all our analyses. We comprehensively characterized the repeatomes by whole-genome sequencing and comparative repeat clustering. Major tandem repeats were localized by multicolour FISH. KEY
resultsThe Hydrangea species show differing repeat profiles reflecting their separation into the two major Hydrangea clades: diploid Hydrangea species from Japan show a conserved repeat profile, distinguishing them from Japanese polyploids as well as Chinese and American hortensias. These results are in line with plastome-based phylogenies. The presence of specific repeats indicates that H. paniculata was not polyploidized directly from the common ancestor of Japanese Hydrangea species, but evolved from a distinct progenitor. Major satellite DNAs were detected over all H. macrophylla chromosomes.
conclusionsRepeat composition among the Hydrangea species varies in congruence with their origins and phylogeny. Identified species-specific satDNAs may be used as cytogenetic markers to identify Hydrangea species and cultivars, and to infer parental species of old Hydrangea varieties. This repeatome and cytogenetics information helps to expand the genetic toolbox for tracing hortensia evolution and guiding future hortensia breeding.
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