Skeletonema tropicum is a marine diatom of the genus Skeletonema that also includes many well-known species including S. marinoi. S. tropicum is a high temperature preferring species thriving in tropical ocean regions or temperate ocean regions during summer-autumn. However, mechanisms of ecological adaptation of S. tropicum remain poorly understood due partially to the lack of a high-quality whole genome assembly. Here, we report the first high-quality chromosome-scale genome assembly for S. tropicum, using cutting-edge technologies including PacBio single molecular sequencing and high-throughput chromatin conformation capture. The assembled genome has a size of 78.78 Mb with a scaffold N50 of 3.17 Mb, anchored to 23 pseudo-chromosomes. In total, 20,613 protein-coding genes were predicted, of which 17,757 (86.14%) genes were functionally annotated. Collinearity analysis of the genomes of S. tropicum and S. marinoi revealed that these two genomes were highly homologous. This chromosome-level genome assembly of S. tropicum provides a valuable genomic platform for comparative analysis of mechanisms of ecological adaption.

热带骨条藻是骨条藻属的海洋硅藻，该属还包括许多著名的物种，包括马里诺骨条藻。 S.tropicum是一种喜高温的物种，夏秋季节在热带海洋地区或温带海洋地区繁衍生息。然而，由于缺乏高质量的全基因组组装，热带沙门氏菌的生态适应机制仍然知之甚少。在这里，我们使用 PacBio 单分子测序和高通量染色质构象捕获等尖端技术，首次报道了S. tropicum的高质量染色体规模基因组组装。组装后的基因组大小为 78.78 Mb，支架 N50 为 3.17 Mb，锚定于 23 条假染色体。总共预测了 20,613 个蛋白质编码基因，其中 17,757 个（86.14%）基因进行了功能注释。对S. tropicum和S. marinoi基因组的共线性分析表明，这两个基因组具有高度同源性。热带S. tropicum的染色体水平基因组组装为生态适应机制的比较分析提供了有价值的基因组平台。