a chromosome-level genome assembly of Liriodendron chinense
Liriodendron chinense (Hemsl.) Sarg. is a Tertiary relict deciduous tree species with important economic and ecological value. It is currently scattered throughout subtropical China and extends into northern Vietnam. Previous studies suggested that populations in its southwestern marginal distribution compared with others exhibit pronounced adaptive phenotypic and genetic differentiation. However, genomic resources representing southwestern populations remain limited, constraining investigations of regional adaptation and genome evolution.. Here, we generated a chromosome-scale genome assembly for L. chinense (YNJP5-5) originated from southwest margins, with a total size of 1.58 Gb. The lengths of assembled chromosomes ranged from 71 Mb to 125 Mb, and 77.29% of the assembled genome was identified as repeat elements. Furthermore, we annotated 43,500 high-confidence protein-coding genes. The extremely high short-read mapping rate (99.99%), together with the high BUSCO completeness (99.3% for the assembly and 99.5% for the annotation) and strong collinearity with other Liriodendron genomes, collectively confirmed the high accuracy and completeness of the present genome. The availability of this genome facilitates in-depth investigations into genome architecture, comparative genomics, and the genetic basis of locally adaptive traits in L. chinense.
Liriodendron chinense (Hemsl.) Sarg. is a Tertiary relict deciduous tree species with important economic and ecological value. It is currently scattered throughout subtropical China and extends into northern Vietnam. Previous studies suggested that populations in its southwestern marginal distribution compared with others exhibit pronounced adaptive phenotypic and genetic differentiation. However, genomic resources representing southwestern populations remain limited, constraining investigations of regional adaptation and genome evolution.. Here, we generated a chromosome-scale genome assembly for L. chinense (YNJP5-5) originated from southwest margins, with a total size of 1.58 Gb. The lengths of assembled chromosomes ranged from 71 Mb to 125 Mb, and 77.29% of the assembled genome was identified as repeat elements. Furthermore, we annotated 43,500 high-confidence protein-coding genes. The extremely high short-read mapping rate (99.99%), together with the high BUSCO completeness (99.3% for the assembly and 99.5% for the annotation) and strong collinearity with other Liriodendron genomes, collectively confirmed the high accuracy and completeness of the present genome. The availability of this genome facilitates in-depth investigations into genome architecture, comparative genomics, and the genetic basis of locally adaptive traits in L. chinense.
South China Botanical Garden, Chinese Academy of Sciences