叶绿体DNA
生物
系统发育树
基因组
进化生物学
核糖体DNA
分类单元
反向重复
属
克莱德
系统发育学
DNA测序
植物
遗传学
DNA
基因
作者
Ling‐Jian Gui,Deng‐Feng Xie,Chang Peng,Ting Ren,Liying Yu,Song‐Dong Zhou,Xing‐Jin He
摘要
Abstract Tongoloa is a herbaceous genus of East Asia Clade (Apiaceae) distributed in the alpine regions. The use of DNA fragments has not provided a well‐resolved evolutionary history. For this research, we primarily collected samples from the type localities of Tongoloa and closely related taxa in the Hengduan Mountains. The chloroplast (cp) genomes and nuclear ribosomal (nr) DNA repeats of 27 taxa were assembled using genome skimming sequencing reads. We analyzed the characteristics of the Tongoloa cp genome, and found a remarkable expansion of the Inverted Repeats. Three genes ( ndhC, ndhJ , and petG ) related to photosynthesis appear to have undergone significant selective pressure. Through high‐resolution phylogenetic analysis, the cpDNA provided compelling evidence supporting the inclusion of Sinolimprichtia as an early taxon within Tongoloa . However, the nrDNA suggested that Tongoloa and Sinolimprichtia belong to distinct branches. Morphological analysis showed that Tongoloa has broadly oval fruits with a cordate base, whereas the fruits of Sinolimprichtia are long‐obovate with an obtuse base. The specific fruit morphology of Sinolimprichtia was found to be nested within Tongoloa in the cpDNA phylogenetic tree. Ancient introgression and chloroplast capture provide the most plausible explanation for the significant conflict between the nrDNA and cpDNA phylogenies. Our study highlights the potential impact of the complex evolutionary history of Tongoloa on the challenges encountered in previous taxonomic treatments.
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