biostudies-literatureIshiguro SGerman Academic Exchange Service LondonBundesministeriums für Bildung und Forschung549-564https://www.ebi.ac.uk/biostudies/studies/S-EPMC11897596biostudies-literatureUnknown135(3)<h4>Background and aims</h4>Ornamental 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.<h4>Methods</h4>We compiled a hortensia genotypAnnals of botanyRepeatome landscapes and cytogenetics of hortensias provide a framework to trace Hydrangea evolution and domestication.PMC1189759657607355 and JPJSBP-120223504Schmidt NHeitkam TWanke SOhmido NIshiguro SJost MTaniguchi SfalseRepeatome landscapes and cytogenetics of hortensias provide a framework to trace Hydrangea evolution and domestication.<h4>Background and aims</h4>Ornamental 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.<h4>Methods</h4>We compiled a hortensia genotyp2025-01-01T00:00:00Z2025 Feb2026-04-08T19:47:27.4Z2025-04-04T09:08:37.819ZS-EPMC118975963984747710.1093/aob/mcae184