Toona ciliata Roem is an important timber species in the Toona genus of the Meliaceae family and an endangered species due to over-cutting and a low rate of natural regeneration in China. Although molecular markers have been applied to studying population genetic diversity, the absence of a reliable reference genome limits in-depth genetic conservation and evolutionary studies of this species. Here, we reported a high-quality assembly of the whole genome sequence of T. ciliata. The total assembled genome has 520.64Mb in length anchored on 28 chromosomes (contig N50 = 4.48Mb). A total of 42,159 genes were predicted after the ab initio, homology-based and transcriptome analyses. A total of 41,284 protein-encoding genes (97.92%) were functionally annotated and 1,246 non-coding RNAs were identified in the T. ciliata genome. Phylogenomic analysis showed that T. ciliata was divergent at 15.06 (6∼25) Mya from T. sinensis of the same genus Toona. This whole genome sequence provides a valuable resource to study genetic conservation and molecular evolution of T. ciliata in the future.

中文翻译：

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香椿（楝科）的染色体水平基因组组装

香椿是楝科香椿属的重要用材树种，在我国因过度采伐和自然更新率低而濒临灭绝。尽管分子标记已应用于研究种群遗传多样性，但缺乏可靠的参考基因组限制了对该物种的深入遗传保护和进化研究。在这里，我们报告了 T. ciliata 全基因组序列的高质量组装。总组装基因组的长度为 520.64Mb，锚定在 28 条染色体上（contig N50 = 4.48Mb）。在从头算、基于同源性和转录组分析之后，共预测了 42,159 个基因。总共有 41,284 个蛋白质编码基因 (97.92%) 进行了功能注释，并在 T. ciliata 基因组中鉴定了 1,246 个非编码 RNA。系统基因组分析表明，T. ciliata在15.06（6∼25）Mya处与同属香椿属的T. sinensis分化。该全基因组序列为未来研究纤毛虫的遗传保护和分子进化提供了宝贵的资源。