Phylogeny of highly hybridogenous Iberian <i>Centaurea</i> L. (Asteraceae) taxa and its taxonomic implications

Arnelas, Itziar; Pérez‐Collazos, Ernesto; Alcaraz, Juan Antonio Devesa; Lopez, E Moreno; Catalán, Pilar

doi:10.1080/11263504.2018.1435569

Cited by 10 publications

(17 citation statements)

References 32 publications

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“…These results are in agreement with our previous estimations of the divergence of these narrow endemic taxa (Fig. 1) during the Pleistocene (1.3-2.2 million years ago [Ma], Arnelas et al, 2018).…”

supporting

confidence: 93%

“…Recent phylogenetic studies have demonstrated that Centaurea sects. Jacea and Lepteranthus, although closely related, belong to different lineages and should be maintained as separate sections (Arnelas et al, 2018). This study also confirmed that the maternal and paternal progenitor species of the allotetraploid C. stuessyi originated from lineages Lepteranthus 1 and 2 of Centaurea sect.…”

supporting

confidence: 76%

“…S2B, S2C, S2D), suggesting that the floral morphotype, in addition to geography, could also contribute to the genetic differentiation of these morphs. However, our nuclear ribosomal internal transcribed spacer (ITS) region-based phylogeny demonstrated that despite the frequent hybridization detected between some taxa, a main split differentiated the lineages defined by sections Jacea and Lepteranthus (Arnelas et al, 2018). Our current AFLP study reinforces this hypothesis since we have recovered a clear genetic segregation of populations and taxa of Centaurea sects.…”

supporting

confidence: 75%

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Taxonomic Differentiation of Iberian Knapweeds (Centaurea sects. Jacea and Lepteranthus, Asteraceae) and Genetic Isolation of Infraspecific Floral Morphotypes

Arnelas

Pérez‐Collazos

Alcaraz³

et al. 2020

annals

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The taxonomic boundaries of Centaurea L. species and infraspecific taxa are often blurred by hybridizations. However, counterbalancing genetic isolation contributes to maintaining taxonomic limits and fostering rapid speciation processes. Radiant (R) and non-radiant (NR) capitula are two major floral morphs present in Centaurea. However, it is unclear how gene flow affects the distribution of floral morphotypes across populations and taxa. We have investigated the taxonomic differentiation and potential effect of genetic isolation in R and NR populations of Iberian Centaurea sects. Jacea (Mill.) Pers. ex Dumort. and Lepteranthus (Neck. ex DC.) Dumort. A total of 510 individuals from 58 populations (12 taxa) were analyzed using 165 amplified fragment length polymorphism (AFLP) markers. Genetic diversity and structure parameters were estimated at the taxon, population, and floral morphotypic levels. We tested whether there was correlation between population pairwise fixation index (Fst) genetic distances and the inbreeding coefficient (Fis), taken as a surrogate of reproductive isolation between the R and NR morphotypes of each group, and also taking into account geographic distances, using distance-based redundancy analysis (dbRDA). We also performed isolation by distance (IBD) tests between different floral morphotypes, aiming to infer the impact of genetic isolation on evolutionary and taxonomic divergence of the individuals. The taxa of Centaurea sects. Jacea and Lepteranthus constitute independent evolutionary lineages. Most of the detected genetic clusters match the taxonomic circumscription proposed in our most recent treatments. Genetic diversity was highest in C. debeauxii Godr. & Gren. subsp. debeauxii and subsp. grandiflora (Gaudin ex Schübl. & G. Martens) Devesa & Arnelas and in C. jacea L. subsp. angustifolia (DC.) Gremli (R) and lowest in C. nevadensis Boiss. & Reut. (NR) within the Centaurea sect. Jacea clade, whereas it was highest in C. linifolia L. within the Centaurea sect. Lepteranthus clade. Population-level dbRDA tests did not detect a significant correlation of R versus NR genetic distances and Fis values in any of the studied cases; by contrast, they detected significant correlation with longitude (C. jacea subsp. angustifolia, C. debeauxii, C. linifolia–C. stuessyi Arnelas, Devesa & E. López) or latitude (C. nigra L.). IBD analysis at the individual level showed that, in addition to geography, other morphotype-related factors may affect the genetic differentiation of R versus NR morphs in C. nigra, C. debeauxii, and C. linifolia–C. stuessyi. These results suggest that the fixation of the different morphs within the same taxon or group may be explained by geographic isolation, though we could not discount other potential unknown factors that could have contributed to microspeciation in these recently divergent populations, which originated only several thousands of years ago.

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confidence: 93%

supporting

confidence: 76%

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confidence: 75%

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Taxonomic Differentiation of Iberian Knapweeds (Centaurea sects. Jacea and Lepteranthus, Asteraceae) and Genetic Isolation of Infraspecific Floral Morphotypes

Arnelas

Pérez‐Collazos

Alcaraz³

et al. 2020

annals

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“…Phylogenetic analyses of the Asteraceae have identified ambiguous relationships between Carduus , Cirsium , and Silybum ( Fu et al, 2016 ; Panero, 2016 ; Arnelas et al, 2018 ); for example, ITS data suggests that Carduus is polyphyletic ( Häffner & Hellwig, 1999 ). Although three coding regions ( matK , rbcL , and ndhF ) were used to reconstruct phylogenetic relationships, the position of Carduus remained unresolved ( Fu et al, 2016 ).…”

Section: Discussionmentioning

confidence: 99%

Comparative analysis and implications of the chloroplast genomes of three thistles (Carduus L., Asteraceae)

Jung

Khoa

Hyun

et al. 2021

PeerJ

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Background Carduus, commonly known as plumeless thistles, is a genus in the Asteraceae family that exhibits both medicinal value and invasive tendencies. However, the genomic data of Carduus (i.e., complete chloroplast genomes) have not been sequenced. Methods We sequenced and assembled the chloroplast genome (cpDNA) sequences of three Carduus species using the Illumina Miseq sequencing system and Geneious Prime. Phylogenetic relationships between Carduus and related taxa were reconstructed using Maximum Likelihood and Bayesian Inference analyses. In addition, we used a single nucleotide polymorphism (SNP) in the protein coding region of the matK gene to develop molecular markers to distinguish C. crispus from C. acanthoides and C. tenuiflorus. Results The cpDNA sequences of C. crispus, C. acanthoides, and C. tenuiflorus ranged from 152,342 bp to 152,617 bp in length. Comparative genomic analysis revealed high conservation in terms of gene content (including 80 protein-coding, 30 tRNA, and four rRNA genes) and gene order within the three focal species and members of subfamily Carduoideae. Despite their high similarity, the three species differed with respect to the number and content of repeats in the chloroplast genome. Additionally, eight hotspot regions, including psbI-trnS_GCU, trnE_UUC-rpoB, trnR_UCU-trnG_UCC, psbC-trnS_UGA, trnT_UGU-trnL_UAA, psbT-psbN, petD-rpoA, and rpl16-rps3, were identified in the study species. Phylogenetic analyses inferred from 78 protein-coding and non-coding regions indicated that Carduus is polyphyletic, suggesting the need for additional studies to reconstruct relationships between thistles and related taxa. Based on a SNP in matK, we successfully developed a molecular marker and protocol for distinguishing C. crispus from the other two focal species. Our study provides preliminary chloroplast genome data for further studies on plastid genome evolution, phylogeny, and development of species-level markers in Carduus.

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“…3B), and for whose taxonomic synthesis abundant material was necessary in order to cover all their diversity, even at the population level (e.g., Invernón and Devesa 2013, Devesa 2016, Martínez-Sagarra and Devesa 2015, 2019, López et al 2016, 2017). Besides, much of the material conserved in COFC also been used in morphological and biogeographic studies (Aedo et al 2015, Cano et al 2017, Devesa et al in press), molecular and phylogeographic studies (Arnelas et al 2018, Benítez-Benítez et al 2018), foliar anatomy studies (Martínez-Sagarra et al 2017), and genome size analysis (Martínez-Sagarra et al work in progress).…”

Section: Interest and Use Of The Collectionmentioning

confidence: 99%

Vascular plants dataset of the herbarium (COFC) of the University of Cordoba, Spain

Martínez-Sagarra¹,

Alcaraz²

2019

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This paper describes the herbarium (COFC) dataset of vascular plants of the University of Cordoba (SW Spain). This dataset is made up of two collections, the General collection (61,377 specimens) and the Historical collection (1,614 specimens). This study has focused mainly on the General collection, which contains the largest number of vascular plant specimens, predominantly angiosperms, mainly provincial and regional (Andalusia, Spain), but also with a good representation of other areas of the Iberian Peninsula and neighboring countries. The place of collection is specified in 99.7% of the labels, about 35% being georeferenced, and it is estimated that, currently, about 86% of the material housed in the herbarium has been databased using Elysia v1.0. software. With more than 178 families, 1,178 genera, and 3,750 species, this collection not only has educational importance, but is a valuable research tool that has been useful for the development of important works such as "Flora Vascular de Andalucía Occidental" and the "Flora iberica". The dataset described in this paper is registered with GBIF (accessible at https://doi.org/10.15468/fdzzal).

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Phylogeny of highly hybridogenous Iberian Centaurea L. (Asteraceae) taxa and its taxonomic implications

Cited by 10 publications

References 32 publications

Taxonomic Differentiation of Iberian Knapweeds (Centaurea sects. Jacea and Lepteranthus, Asteraceae) and Genetic Isolation of Infraspecific Floral Morphotypes

Taxonomic Differentiation of Iberian Knapweeds (Centaurea sects. Jacea and Lepteranthus, Asteraceae) and Genetic Isolation of Infraspecific Floral Morphotypes

Comparative analysis and implications of the chloroplast genomes of three thistles (Carduus L., Asteraceae)

Vascular plants dataset of the herbarium (COFC) of the University of Cordoba, Spain

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