Phylogenetic, cytogenetic and morphological evidences are critical for recognizing a new genus: Valdesiana, an Iberian intergeneric allopolyploid between Schenkia and Exaculum

Díaz Lifante, Zoila; Escudero, Marcial; Andrés Camacho, Cristina; García Llamas, Carmen; Loureiro, Joao; Castro, Sílvia

doi:10.1007/s00606-023-01864-0

Cited by 3 publications

(2 citation statements)

References 112 publications

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“…Hybridogenous species of more‐or‐less ancient intergeneric origin can be reliably identified only by molecular techniques, and they are still rarely recognized (Wallace & Jansen 1995; German & Friesen 2014; Díaz Lifante et al . 2023), more often only hypothesized (e.g., Soejima et al . 2008; Calvo et al .…”

Section: Discussionmentioning

confidence: 99%

“…H.3.3, Note 1 in Turland et al 2018), the allotetraploid C. vulgare cannot be ascribed to the nothogenus ×Lophiocirsium Del Guacchio, Bureš, Iamonico & P. Caputo, comprising occasionally originating spontaneous intergeneric hybrids between species of Cirsium and Lophiolepis genera. Hybridogenous species of more-or-less ancient intergeneric origin can be reliably identified only by molecular techniques, and they are still rarely recognized (Wallace & Jansen 1995;German & Friesen 2014;Dı ´az Lifante et al 2023), more often only hypothesized (e.g., Soejima et al 2008;Calvo et al 2013). In addition, there is no general agreement about the taxonomic assessment of these hybridogenous taxa, and the ICN is almost silent on this matter.…”

Section: Taxonomic and Phylogenetic Consequences Of Hybridogenity Of ...mentioning

confidence: 99%

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Intergeneric hybrid origin of the invasive tetraploid Cirsium vulgare

Bureš,

Del Guacchio,

Šmerda

et al. 2024

Plant Biol J

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The invasive tetraploid Cirsium vulgare hybridizes with both Cirsium and Lophiolepis. Its conflicted position in molecular phylogenies, and its peculiar combination of morphological, anatomical, and genomic features that are alternatively shared with representatives of Cirsium or Lophiolepis, strongly suggest its intergeneric hybrid origin. Genetic relationships of C. vulgare (8 samples) with genus Lophiolepis (11 species) and other representatives of genus Cirsium (12 species) were evaluated using restriction site‐associated DNA sequencing (RADseq) and examined using analytical and imaging approaches, such as NeighborNet, Heatmap, and STRUCTURE, to identify nuclear genomes admixture. Estimation of the intensity of spontaneous hybridization within and between Cirsium and Lophiolepis was based on herbarium revisions and published data for all reported hybrids pertinent to taxa currently included in Cirsium or Lophiolepis. The genome of any examined Cirsium species is more similar to C. vulgare than to any Lophiolepis species, and vice versa. The nuclear genome of the tetraploid C. vulgare is composed of two equivalent parts, each attributable either to Lophiolepis or to Cirsium; the organellar RADseq data clustered C. vulgare with the genus Cirsium. Spontaneous hybridization between Cirsium and Lophiolepis is significantly less intensive than within these genera. Our analyses provide compelling evidence that the invasive species C. vulgare has an allotetraploid intergeneric origin, with the maternal parent from Cirsium and the paternal from Lophiolepis. For the purpose of delimiting monophyletic genera, we propose keeping Lophiolepis separate from Cirsium and segregating C. vulgare into the hybridogenous genus Ascalea.

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Section: Discussionmentioning

confidence: 99%

Section: Taxonomic and Phylogenetic Consequences Of Hybridogenity Of ...mentioning

confidence: 99%

Intergeneric hybrid origin of the invasive tetraploid Cirsium vulgare

Bureš,

Del Guacchio,

Šmerda

et al. 2024

Plant Biol J

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The role of deep hybridization in fern speciation: Examples from the Thelypteridaceae

Tseng,

Kuo,

Borokini

et al. 2024

American J of Botany

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PremiseHybridization is recognized as an important mechanism in fern speciation, with many allopolyploids known among congeners, as well as evidence of ancient genome duplications. Several contemporary instances of deep (intergeneric) hybridization have been noted, invariably resulting in sterile progeny. We chose the christelloid lineage of the family Thelypteridaceae, recognized for its high frequency of both intra‐ and intergeneric hybrids, to investigate recent hybrid speciation between deeply diverged lineages. We also seek to understand the ecological and evolutionary outcomes of resulting lineages across the landscape.MethodsBy phasing captured reads within a phylogenomic data set of GoFlag 408 nuclear loci using HybPhaser, we investigated candidate hybrids to identify parental lineages. We estimated divergence ages by inferring a dated phylogeny using fossil calibrations with treePL. We investigated ecological niche conservatism between one confirmed intergeneric allotetraploid and its diploid progenitors using the centroid, overlap, unfilling, and expansion (COUE) framework.ResultsWe provide evidence for at least six instances of intergeneric hybrid speciation within the christelloid clade and estimate up to 45 million years of divergence between progenitors. The niche quantification analysis showed moderate niche overlap between an allopolyploid species and its progenitors, with significant divergence from the niche of one progenitor and conservatism to the other.ConclusionsThe examples provided here highlight the overlooked role that allopolyploidization following intergeneric hybridization may play in fern diversification and range and niche expansions. Applying this approach to other fern taxa may reveal a similar pattern of deep hybridization resulting in highly successful novel lineages.

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Surveying the vascular flora of the Iberian Central Range: a critical checklist of the Ávila province flora

Luceño,

Rogelio Sánchez-Villegas,

Begoña Quirós-de-la-Peña

et al. 2024

Mediterr. Bot.

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Abstract. Despite its proximity to cities with important botanical institutions such as Madrid and Salamanca, and its location between important mountain ranges (Gredos and Malagón mountain ranges), the flora of the province of Ávila had not been studied comprehensively until now. In this article, we present the first checklist of the vascular flora of this province, which is the result of a thorough critical bibliographic review, numerous field trips, and the study of materials preserved in Iberian herbaria, mainly those that house the majority of the collections made in the province. The taxonomic and nomenclatural treatment takes into account the results of the latest monographic works and, particularly, the molecular phylogeny studies conducted over three decades. These studies have substantially changed the classification to align it with the evolutionary processes that have contributed to the current plant biodiversity. We have accepted a total of 1960 taxa (species and subspecies), with 1797 considered native and 163 introduced. Additionally, we present the floristic spectrum of the province and the state of conservation of its flora. All of this is discussed in light of the data provided by the complete checklists available from neighbouring provinces. For each taxon, we highlight its presence or absence in the three ecological regions into which we have divided the province (La Moraña region, Sierra de Gredos, and Sierra de Malagón). Where necessary, we provide observations regarding its distribution, taxonomy, or nomenclature. Notably, we include the genus Exaculum in Schenkia, leading us to propose a new nomenclatural combination.

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Phylogenetic, cytogenetic and morphological evidences are critical for recognizing a new genus: Valdesiana, an Iberian intergeneric allopolyploid between Schenkia and Exaculum

Cited by 3 publications

References 112 publications

Intergeneric hybrid origin of the invasive tetraploid Cirsium vulgare

Intergeneric hybrid origin of the invasive tetraploid Cirsium vulgare

The role of deep hybridization in fern speciation: Examples from the Thelypteridaceae

Surveying the vascular flora of the Iberian Central Range: a critical checklist of the Ávila province flora

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