Li Qin-Qin, Zhang Zhi-Ping, Wen Jun
College of Life Science and Technology, Inner Mongolia Normal University, Hohhot, China.
Key Laboratory of Biodiversity Conservation and Sustainable Utilization in Mongolian Plateau for College and University of Inner Mongolia Autonomous Region, Hohhot, China.
Front Plant Sci. 2024 Apr 30;15:1349358. doi: 10.3389/fpls.2024.1349358. eCollection 2024.
The genus Hill belongs to the tribe Potentilleae Sweet and contains approximately 75 species predominantly distributed in the Sino-Himalayan region and the Malesian archipelago. So far we have less knowledge on the phylogenetic relationships within owing to limited sampling of taxa or gene fragments in previous studies. Moreover, to date there is no phylogenetic study on from the perspective of comparative chloroplast (cp) genomics. Here we performed comparative genomic analyses on the cp genomes of 39 accessions representing 18 taxa of . The cp genomes presented the typical quadripartite structure, with the sizes ranging from 155 096 bp to 157 166 bp. The 39 cp genomes contained a set of 112 unique genes, comprising four ribosomal RNA (rRNA) genes, 30 transfer RNA (tRNA) genes, as well as 78 protein-coding genes (PCGs). The cp genome organization, gene content and order in were highly conserved, but some visible divergences were present in IR/SC boundary regions. Ten regions () were identified as excellent candidate DNA markers for future studies on species identification, population genetics and phylogeny of . Our results indicated that is monophyletic. In the current sampling, the - clade was sister to the remainder of . Our results corroborated the previous taxonomic treatments to transfer and from the genus L. to . Our results showed close relationships among , , , and , congruent with previous studies based on the morphology of these species. Twenty-six genes () were with sites under positive selection, and adaptive evolution of these genes might have played crucial roles in species adaptation to the harsh mountain environment. This study will facilitate future work on taxonomy, phylogenetics, and adaptive evolution of .
希尔属属于委陵菜族(Potentilleae Sweet),包含约75个物种,主要分布于中国 - 喜马拉雅地区和马来群岛。由于先前研究中分类群或基因片段的采样有限,到目前为止我们对其内部的系统发育关系了解较少。此外,迄今为止,尚未从比较叶绿体(cp)基因组学的角度对希尔属进行系统发育研究。在此,我们对代表希尔属18个分类群的39份材料的cp基因组进行了比较基因组分析。希尔属的cp基因组呈现典型的四分体结构,大小范围为155,096 bp至157,166 bp。这39个希尔属的cp基因组包含一组112个独特基因,包括4个核糖体RNA(rRNA)基因、30个转运RNA(tRNA)基因以及78个蛋白质编码基因(PCG)。希尔属的cp基因组组织、基因含量和顺序高度保守,但在IR/SC边界区域存在一些明显差异。10个区域被确定为未来希尔属物种鉴定、群体遗传学和系统发育研究的优秀候选DNA标记。我们的结果表明希尔属是单系的。在当前采样中,某一支系是希尔属其余部分的姐妹支系。我们的结果证实了先前将某几个分类群从某属转移到希尔属的分类处理。我们的结果显示了某几个分类群之间的密切关系,这与先前基于这些物种形态学的研究一致。26个基因存在正选择位点,这些基因的适应性进化可能在希尔属物种适应恶劣山地环境中发挥了关键作用。本研究将促进未来关于希尔属分类学、系统发育学和适应性进化的工作。