<b>Two haplotype-resolved telomere-to-telomere genome assemblies of </b><b><i>Xanthoceras sorbifolium</i></b>

Yellowhorn (Xanthoceras sorbifolium) is widely used for landscaping, desertification control, and oil production in northern China. However, the lack of high-quality genomes has hindered breeding and evolutionary studies. Here, we present the first haplotype-resolved, telomere-to-telomere (T2T) yellowhorn genomes of PBN-43 (white single-flowered) and PBN-126 (white double-flowered) using PacBio HiFi and Hi-C data. These assemblies range from 464.34 Mb to 468.97 Mb and include all centromeres and telomeres. Genome annotation revealed that an average of 67.99% (317.09 Mb) of yellowhorn genomic regions consist of repetitive elements across all haplotypes, and the protein-coding genes number range from 35,039 to 35,174 among assemblies, representing an average 50.16% increase compared to the first published yellowhorn genome. Additionally, 93.90% of the annotated genes have functional annotations.