形态学和分子分析一致支持Hypochaeris achyrophorus(菊科,Cichorieae)下存在两个种

IF 3 2区 生物学 Q2 EVOLUTIONARY BIOLOGY
Taxon Pub Date : 2024-09-13 DOI:10.1002/tax.13248
Francisco Javier Jiménez‐López, María Talavera, María Ángeles Ortiz
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引用次数: 0

摘要

Hypochaeris sect.Seriola(菊科,Cichorieae)中的物种界限很难确定,因为类群之间存在表型相似性。本研究的主要目的是利用质粒和核 DNA 标记确定一年生 Hypochaeris achyrophorus 的系统发育位置,并确定地中海西部和东部种群之间的一些形态差异是否得到遗传差异的支持。为此,进行了系统发育重建、物种划分分析和花特征形态分析。该案例为研究一年生/多年生和同花/异花的演变提供了一个绝佳的环境。研究结果证实,H. achyrophorus 中存在两个不同的类群:H.achyrophorus在生物地理学和形态学上具有不同的特征,在系统发育上更接近于多年生物种H. laevigata,而不是H. stuessyi。我们的研究结果表明,多年生习性和同种异形是该研究族群中的衍生特征,在进化过程中可多次出现,从而使传统的分类学变得复杂。此外,当观察到具有趋同特征的相关物种时,只有使用分子工具才能证实细微的形态差异具有不同的进化历史。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Morphological and molecular analyses consistently support the existence of two species under Hypochaeris achyrophorus (Asteraceae, Cichorieae)
The species boundaries in Hypochaeris sect. Seriola (Asteraceae, Cichorieae) are difficult to establish due to the phenotypic similarity between taxa. The main objective of the present study was to characterize the phylogenetic position of the annual Hypochaeris achyrophorus using plastid and nuclear DNA markers, and to determine whether some morphological differences between western and eastern Mediterranean populations are supported by genetic differences. To achieve this, phylogenetic reconstruction, species delimitation analysis and morphometrical analysis of flower characters were carried out. The case provides a fantastic setting to study the evolution of annuality/perenniality and homocarpy/heterocarpy. The results confirm the presence of two distinct taxa within H. achyrophorus: Hypochaeris stuessyi comb. nov., in the westernmost part of the distribution, containing populations with the most ancestral characters, and H. achyrophorus, with biogeographically and morphologically distinct characters, phylogenetically closer to H. laevigata, a perennial species, than to H. stuessyi. Our results indicate that perennial habit and homocarpy are derived characters in the study group that can appear multiple times in evolution, complicating traditional taxonomy. Moreover, when related species with convergent characters are observed, only the use of molecular tools can confirm that subtle morphological differences have distinct evolutionary histories.
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来源期刊
Taxon
Taxon 生物-进化生物学
CiteScore
4.70
自引率
8.80%
发文量
177
审稿时长
6-12 weeks
期刊介绍: TAXON is the bi-monthly journal of the International Association for Plant Taxonomy and is devoted to systematic and evolutionary biology with emphasis on plants and fungi. It is published bimonthly by the International Bureau for Plant Taxonomy and Nomenclature, c/o Institute of Botany, Slovak Academy of Sciences, Dúbravská cesta 9, SK-845 23 Bratislava, SLOVAKIA. Details of page charges are given in the Guidelines for authors. Papers will be reviewed by at least two specialists.
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