A novel indicator of karyotype evolution in the tribe Leucocoryneae (Allioideae, Amaryllidaceae)

Sassone, Agostina B.; López, Alicia; Hojsgaard, Diego; Giussani, Liliana M.

doi:10.1007/s10265-017-0987-4

Cited by 18 publications

(26 citation statements)

References 38 publications

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“…The phylogenetic relationships of the tribe have been studied by several authors (Souza & al., 2016; Pellicer & al., 2017; Sassone & Giussani, 2018), and the monophyly of Ipheion is not doubted; however, depending on the combination of the molecular markers and the sampling, Ipheion is found nested within Tristagma (Sassone & Giussani, 2018) or as a sister clade to the latter (Souza & al., 2016; Pellicer & al., 2017). The identity of Ipheion is also supported by morphological characters (spathe formed by one bifid bract [= two bracts fused for more than ¾ of their length] and unifloral inflorescences), distribution (if restricted to the Pampean region), and karyological features (Souza & al., 2010; Sassone & al., 2018).…”

Section: Introductionmentioning

confidence: 99%

One species with a disjunct distribution or two with convergent evolution? Taxonomy of two South American garlics

Sassone

Arroyo

Arroyo-Leuenberger

et al. 2021

TAXON

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The establishment of species boundaries has been a difficult task for biologists since the beginning of classifications. Within South American Allioideae (= Alliaceae), the delimitation of genera and species has long been a major challenge. Consequently, species‐level nomenclature in these groups has been difficult to elucidate. Ipheion and Tristagma are two closely related South American genera for which the delimitation and circumscription of several species continue to be unclear. Tristagma sessile, a species inhabiting the Andes and the Coast Range in Chile, and Ipheion recurvifolium, a species native to Uruguay only found close to sea level, have been considered as one species with an intracontinental disjunct distribution. The divergent habitats and distributions of these taxa have stirred the question of whether they are a single species. The present study aims to elucidate the evolutionary relationships and status of the Chilean and Pampean taxa. We also analysed the name Tristagma leichtlinii, which has long been a source of confusion. Based on their phylogenetic relationships, geographical distributions, flowering periods, and DNA content, we conclude that the two taxa are different species and assignable to separate genera. We propose that the morphological similarity of Ipheion recurvifolium and Tristagma sessile, amply corroborated in this study, might be the sum of shared synapomorphies (between Ipheion and Tristagma) and convergent features. We update the biogeographic history of the two genera and propose that similar pollinators might underpin the convergence in floral traits. We outline the differences among genera and species, present a taxonomic review with a new lectotype and consider the conservation status of the studied species.

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Section: Introductionmentioning

confidence: 99%

One species with a disjunct distribution or two with convergent evolution? Taxonomy of two South American garlics

Sassone

Arroyo

Arroyo-Leuenberger

et al. 2021

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“…The long time of origin, stable diversification rates, and relatively low number of species in Gilliesieae (80 species) and Tulbaghieae (26 species) may suggest that these are relictual lineages. In this sense, the scenario of multiple geomorphological changes in South America, mainly caused by the Andean uplift (Antonelli et al, 2009;Pennington et al, 2010), may have been responsible for phylogenetic, karyotype and morphological differentiation in Gilliesieae species (Rudall et al, 2002;Pellicer et al, 2017;Sassone et al, 2018). The origin of the Andes is related here to the isolation of the Chilean clade with strong differentiation in floral morphology (Rudall et al, 2002;Escobar, 2012) and karyotypes.…”

Section: Evolutionary History Of Each Allioideae Lineage Impacts In Tmentioning

confidence: 96%

“…The subfamily Allioideae of Amaryllidaceae (sensu Angiosperm Phylogeny Group [APG], 2016) is an excellent model to assess the links between karyotypes and environmental variables by presenting large chromosomes with remarkable cytogenetic variability (Vosa, 2000;Souza et al, 2016;Pellicer et al, 2017;Peruzzi et al, 2017;Sassone et al, 2018), associated with an intriguing discontinuous geographical distribution (Figure 1). Allioideae is phylogenetically composed of three tribes (Angiosperm Phylogeny Group [APG], 2016): Allieae, Gilliesieae, and Tulbaghieae, which are exclusively distributed in North Hemisphere, South America (Peru to Chile), and Southern Africa, respectively (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

“…Rouy which present different chromosome numbers] (Peruzzi et al, 2017). Conversely, the South American Gilliesieae present the highest karyotype variability in Allioideae: it is represented by both different basic chromosome numbers (x = 4, 5, 6, 7, and 10) and chromosome numbers (2n = 8, 10, 12, 14, 15, 16, 18, 19, 20, 24, 26, and 32) resulted from intense Robertsonian translocation and polyploidy events (Escobar, 2012;Souza et al, 2016;Pellicer et al, 2017;Sassone et al, 2018). In addition, analyses of heterochromatic bands and distribution of 5S/35S rDNA sites by fluorescence in situ hybridization (FISH) have revealed extensive cytomolecular variability in the subfamily (Souza et al, 2016(Souza et al, , 2019b.…”

Section: Introductionmentioning

confidence: 99%

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Divide to Conquer: Evolutionary History of Allioideae Tribes (Amaryllidaceae) Is Linked to Distinct Trends of Karyotype Evolution

et al. 2020

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Allioideae (e.g., chives, garlics, onions) comprises three mainly temperate tribes: Allieae (800 species from the northern hemisphere), Gilliesieae (80 South American species), and Tulbaghieae (26 Southern African species). We reconstructed the phylogeny of Allioideae (190 species plus 257 species from Agapanthoideae and Amaryllidoideae) based on ITS, matK, ndhF, and rbcL to investigate its historical biogeography and karyotype evolution using newly generated cytomolecular data for Chilean Gilliesieae genera Gethyum, Miersia, Solaria, and Speea. The crown group of Allioideae diversified ∼62 Mya supporting a Gondwanic origin for the subfamily and vicariance as the cause of the intercontinental disjunction of the tribes. Our results support the hypothesis of the Indian tectonic plate carrying Allieae to northern hemisphere ('out-of-India' hypothesis). The colonization of the northern hemisphere (∼30 Mya) is correlated with a higher diversification rate in Allium associated to stable x = 8, increase of polyploidy and the geographic expansion in Europe and North America. Tulbaghieae presented x = 6, but with numerical stability (2n = 12). In contrast, the tribe Gilliesieae (x = 6) varied considerably in genome size (associated with Robertsonian translocations), rDNA sites distribution and chromosome number. Our data indicate that evolutionary history of Allioideae tribes is linked to distinct trends of karyotype evolution.

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“…Features of chromosomes play an important role in plant taxonomy to elucidate the origin, speciation and phylogenetic relationships of plants (Stebbins 1971;Peruzzi and Altınordu 2014;Sassone et al 2017;Winterfeld et al 2020). Chromosome counts were proven to be most valuable in the taxonomy of Sorbus long before the era of molecular phylogenetics because they are helpful in understanding the species' relationships and origins (Liljefors 1934(Liljefors , 1953(Liljefors , 1955Sennikov and Kurtto 2017).…”

Section: Introductionmentioning

confidence: 99%

Genome size variation and karyotype diversity in eight taxa of Sorbus sensu stricto (Rosaceae) from China

Li¹,

Zhu²,

Wang³

2021

CCG

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Eight taxa of Sorbus Linnaeus, 1753 sensu stricto (Rosaceae) from China have been studied karyologically through chromosome counting, chromosomal measurement and karyotype symmetry. Genome size was also estimated by flow cytometry. Six taxa, S. amabilis Cheng ex T.T.Yu et K.C.Kuan, 1963, S. hupehensis var. paucijuga (D.K. Zang et P.C. Huang, 1992) L.T. Lu, 2000, S. koehneana C.K. Schneider, 1906, S. pohuashanensis (Hance, 1875) Hedlund, 1901, S. scalaris Koehne, 1913 and S. wilsoniana C.K. Schneider, 1906 are diploids with 2n = 34, whereas two taxa, S. filipes Handel-Mazzetti,1933 and S. ovalis McAllister, 2005 are tetraploid with 2n = 68. In general, the chromosome size is mainly small, and karyotypes are symmetrical with predominance of metacentric chromosomes. Genome size variation of diploids and tetraploids is 1.401 pg –1.676 pg and 2.674 pg –2.684 pg, respectively. Chromosome numbers of S. amabilis and S. hupehensis var. paucijuga, and karyotype and genome size of eight taxa studied are reported for the first time. This study emphasised the reliability of flow cytometry in genome size determination to infer ploidy levels in Chinese native Sorbus species.

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A novel indicator of karyotype evolution in the tribe Leucocoryneae (Allioideae, Amaryllidaceae)

Cited by 18 publications

References 38 publications

One species with a disjunct distribution or two with convergent evolution? Taxonomy of two South American garlics

One species with a disjunct distribution or two with convergent evolution? Taxonomy of two South American garlics

Divide to Conquer: Evolutionary History of Allioideae Tribes (Amaryllidaceae) Is Linked to Distinct Trends of Karyotype Evolution

Genome size variation and karyotype diversity in eight taxa of Sorbus sensu stricto (Rosaceae) from China

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