Plastid phylogenomics provide evidence to accept a new genus Pseudopeucedanum (Apiaceae) separated from Peucedanum s.l.

IF 2.3 2区 生物学 Q2 PLANT SCIENCES
Chang-Kun Liu, Jiao-Jiao Deng, Bo-Ni Song, Huan-Huan Qin, Song-Dong Zhou, Xing-Jin He
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Abstract

Abstract The species Peucedanum ledebourielloides, a medicinally important herb, has previously been placed in Peucedanum s.l. based on dorsally compressed mericarps with slightly prominent dorsal ribs and narrowly winged lateral ribs. However, this genus has now been re-delimited in a narrow sense, namely Peucedanum s.s., further recognized by ternate leaves and glabrous plants, so that the taxonomic position of P. ledebourielloides is unknown. To investigate the taxonomic position of this species, we sequenced and assembled the complete plastomes for two samples of P. ledebourielloides. Phylogenetic analyses based on 79 protein-coding genes showed that the samples of P. ledebourielloides formed a separate clade and were distant from Peucedanum morisonii, a representative member of Peucedanum s.s., implying that P. ledebourielloides cannot not be placed in Peucedanum s.s. Additionally, plastome comparisons and chromosome studies indicated the clear specificity of P. ledebourielloides. In particular, pinnate leaves and dorsally compressed mericarps densely covered with forked scabrous bristles, slightly prominent dorsal ribs, narrowly winged lateral ribs, and one vitta in each furrow and two vittae on the commissure clearly distinguished P. ledebourielloides from Peucedanum s.s. and other genera of Apiaceae. Hence, a new genus, Pseudopeucedanum gen. nov., was established to accommodate this species. Our results improve the taxonomy of the family Apiaceae and provide guidance for the taxonomic revision of other taxa that are difficult to place systematically.
质体系统基因组学为从拟花楸属(Peucedanum s.l)中分离出一个新属提供了证据。
Peucedanum ledebourielloides是一种重要的药用草本植物,以前曾根据背向压缩的分片,背肋略突出,侧肋窄翅,将其归入Peucedanum s.l.。然而,该属已被重新划为狭义的Peucedanum s.s.,并进一步被三生叶和无毛植物所识别,因此该属的分类位置尚不清楚。为了研究该物种的分类位置,我们对两个样品的全质粒进行了测序和组装。基于79个蛋白编码基因的系统发育分析表明,ledebourielloides样品形成了一个独立的分支,与Peucedanum morisonii (Peucedanum s.s.)的代表成员Peucedanum morisonii距离较远,表明ledebourielloides不可能不属于Peucedanum s.s.。此外,体组比较和染色体研究表明,ledebourielloides具有明确的特异性。特别是羽状叶和背侧压紧的分果被浓密的叉状粗糙刚毛覆盖,背棱略突出,侧棱窄翅,每沟1个维托,连合处2个维托,明显地将ledebourielloides与蜜蜂科Peucedanum s.s s等属区分开来。因此,一个新的属,pseudoeucedanum gen. nov.,被建立来容纳这个物种。本研究结果完善了蜂科的分类学,并为其他难以系统定位的分类类群的分类修订提供了指导。
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来源期刊
CiteScore
5.70
自引率
8.30%
发文量
54
审稿时长
3.5 months
期刊介绍: The Botanical Journal of the Linnean Society publishes original papers on systematic and evolutionary botany and comparative studies of both living and fossil plants. Review papers are also welcomed which integrate fields such as cytology, morphogenesis, palynology and phytochemistry into a taxonomic framework. The Journal will only publish new taxa in exceptional circumstances or as part of larger monographic or phylogenetic revisions.
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