The complete chloroplast genome and phylogenetic analysis of Artocarpus nitidus subsp. lingnanensis (Moraceae)

Artocarpus nitidus subsp. lingnanensis is an evergreen tree species bearing sour-sweet fruits. Although its economic and medicinal potential has been indicated by some phytochemical studies, the phylogenetic position of this species remains unclear. To address this, we sequenced and assembled its complete chloroplast genome for the first time. The genome with a total length of 161,009 bp and a GC content of 35.79%, displays the conventional quadripartite organization comprising four segments: an 89,552 bp large single-copy (LSC) region, a 20,093 bp small single-copy (SSC) region, and two 25,682 bp inverted repeat (IR) regions. Annotation identified 132 genes, encompassing 87 protein-coding genes, 37 tRNAs, and 8 rRNAs. Phylogenetic analysis revealed that A. nitidus subsp. lingnanensis forms a distinct clade with its closest relatives, A. petelotii, A. tonkinensis, A. hypargyreus, and A. gomezianus. This study provides the first complete chloroplast genomic resource for A. nitidus subsp. lingnanensis and offers valuable data for future research on genetic diversity and utilization.

光叶桂木（Artocarpus nitidus subsp. lingnanensis）是一类结有酸甜适口果实的常绿乔木。尽管部分植物化学研究已揭示其经济与药用开发潜力，但该物种的系统发育位置至今仍未明确。为厘清这一问题，本研究首次完成了其完整叶绿体基因组（chloroplast genome）的测序与组装工作。该基因组总长161,009 bp，GC含量为35.79%，具备典型的四分体结构，包含四个功能区段：89,552 bp的大单拷贝（LSC）区域、20,093 bp的小单拷贝（SSC）区域，以及两段各长25,682 bp的反向重复（IR）区域。通过基因注释共鉴定得到132个基因，其中包括87个蛋白编码基因、37个转运RNA（tRNA）基因与8个核糖体RNA（rRNA）基因。系统发育分析结果显示，光叶桂木与其近缘类群A. petelotii、A. tonkinensis、A. hypargyreus及A. gomezianus共同构成一个独立的演化支。本研究首次为光叶桂木提供了完整的叶绿体基因组资源，可为后续该物种的遗传多样性研究与资源开发利用提供极具价值的数据支撑。