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Two haplotype-resolved genomes reveal important flower traits in bigleaf hydrangea(Hydrangea macrophylla)and insights into Asterid evolution

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Horticulture Research 2023年第12期10卷 45-57页

作者： Xingbo Wu Sheron A.Simpson Ramey C.Youngblood xiaofen fliu Brian E.Scheffler Timothy A.Rinehart Lisa W.Alexander Amanda M.Hulse-Kemp Department of Environmental Horticulture Tropical Research and Education CenterUniversity of FloridaHomesteadFL 33031United States Genomics and Bioinformatics Research Unit USDA-ARSRaleighNC 27695United States Genomics and Bioinformatics Research Unit USDA-ARSStonevilleMS 38776United States Institute for Genomics Biocomputing and BiotechnologyMississippi State UniversityStarkvilleMS 39762United States Crop Production and Protection USDA-ARSBeltsvilleMD 20705United States Floral and Nursery Plants Research Unit U.S.National ArboretumUSDA-ARSMcMinnvilleTN 37110United States Department of Crop and Soil Sciences North Carolina State UniversityRaleighNC 27695United States

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,N5022.8 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.

关键词： Hydra traits resolved

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