Abstract
Abstract The Hydrangea genus belongs to the Hydrangeaceae family, in the Cornales order of flowering plants, which early diverged among the Asterids, and includes several species that are commonly used ornamental plants. Of them, Hydrangea macrophylla is one of the most valuable species in the nursery trade, yet few genomic resources are available for this crop or closely related Asterid species. Two high-quality haplotype-resolved reference genomes of hydrangea cultivars ‘Veitchii’ and ‘Endless Summer’ [highest quality at 2.22 gigabase pairs (Gb), 396 contigs, N50 22.8 megabase pairs (Mb)] were assembled and scaffolded into the expected 18 pseudochromosomes. Utilizing the newly developed high-quality reference genomes along with high-quality genomes of other related flowering plants, nuclear data were found to support a single divergence point in the Asterids clade where both the Cornales and Ericales diverged from the euasterids. Genetic mapping with an F1 hybrid population demonstrated the power of linkage mapping combined with the new genomic resources to identify the gene for inflorescence shape, CYP78A5 located on chromosome 4, and a novel gene, BAM3 located on chromosome 17, for causing double flower. Resources developed in this study will not only help to accelerate hydrangea genetic improvement but also contribute to understanding the largest group of flowering plants, the Asterids.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
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Claims 4
Claim · model-written summary
Two haplotype-resolved hydrangea cultivar genomes were assembled into 18 pseudochromosomes.
- Outcome
- haplotype-resolved reference genomese0
- Value
- 18 pseudochromosomese0
- Qualifier
- highest quality at 2.22 gigabase pairs (Gb), 396 contigs, N50 22.8 megabase pairs (Mb)e0
HydrangeaOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two high-quality haplotype-resolved reference genomes of hydrangea cultivars ‘Veitchii’ and ‘Endless Summer’ [highest quality at 2.22 gigabase pairs (Gb), 396 contigs, N50 22.8 megabase pairs (Mb)] were assembled and scaffolded into the expected 18 pseudochromosomes.”
Claim · model-written summary
Nuclear data support a single Asterid divergence point for Cornales and Ericales from euasterids.
Verbatim
e0“nuclear data were found to support a single divergence point in the Asterids clade where both the Cornales and Ericales diverged from the euasterids.”
Claim · model-written summary
Mapping identified CYP78A5 on chromosome 4 as the gene for inflorescence shape.
- Taxon
- Hydrangea macrophylla
_Hydrangea_macrophylla%2C_Iwafune%2C_Isumi%2C_Chiba%2C_Japan_2.jpg?width=60)
Hydrangea macrophyllat0 - Gene
- CYP78A5e0
- Outcome
- inflorescence shapee0
- Qualifier
- chromosome 4e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Hydrangea_macrophylla%2C_Iwafune%2C_Isumi%2C_Chiba%2C_Japan_2.jpg?width=500)
Verbatim
t0“Hydrangea macrophylla”
e0“identify the gene for inflorescence shape, CYP78A5 located on chromosome 4”
Claim · model-written summary
Mapping identified novel BAM3 on chromosome 17 as causing double flowers.
- Taxon
- Hydrangea macrophyllaHydrangea macrophyllat0
- Gene
- BAM3e0
- Outcome
- double flowere0
- Qualifier
- chromosome 17e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Hydrangea macrophylla”
e0“a novel gene, BAM3 located on chromosome 17, for causing double flower”