Key Laboratory for Bio-Resource and Eco-Environment of Ministry of Education & Sichuan Zoige Alpine Wetland Ecosystem National Observation and Research Station, College of Life Science, Sichuan University, Chengdu, China.
Sci Data. 2024 Jul 2;11(1):719. doi: 10.1038/s41597-024-03568-7.
Helwingia, a shrub of the monotypic cosmopolitan family Helwingiaceae, is distinguished by its inflorescence, in which flowers are borne on the midrib of the leaf-a trait not commonly observed in related plant families. Previous studies have investigated the development of this unusual structure using comparative anatomical methods. However, the scarcity of genomic data has hindered our understanding of the origins and evolutionary history of this uncommon trait at the molecular level. Here, we report the first high-quality genome of the family Helwingiaceae. Assembled using HiFi sequencing and Hi-C technologies, the genome of H. omeiensis is anchored to 19 chromosomes, with a total length of 2.75 Gb and a contig N50 length of 6.78 Mb. The BUSCO completeness score of the assembled genome was 98.2%. 53,951 genes were identified, of which 99.7% were annotated in at least one protein database. The high-quality reference genome of H. omeiensis provides an essential genetic resource and sheds light on the phylogeny and evolution of specific traits in the family Helwingiaceae.
青荚叶为单种科青荚叶科的灌木，其花序的特征在于花着生于叶片中脉上，这一特征在相关植物科中并不常见。先前的研究使用比较解剖学方法研究了这一不寻常结构的发育。然而，基因组数据的缺乏阻碍了我们从分子水平上理解这一不常见特征的起源和进化历史。在这里，我们报告了青荚叶科的第一个高质量基因组。使用 HiFi 测序和 Hi-C 技术组装的青荚叶基因组被锚定到 19 条染色体上，总长度为 27.5 Gb，contig N50 长度为 6.78 Mb。组装基因组的 BUSCO 完整性评分为 98.2%。鉴定出 53951 个基因，其中至少在一个蛋白质数据库中注释了 99.7%的基因。高质量的青荚叶参考基因组为该科的系统发育和特定特征的进化提供了重要的遗传资源。
