A profile of male meiosis, chromosomal variation and status in species of<i>Impatiens</i>from North-West Himalaya in India

Singhal, Vijay Kumar; Kumar, Rohit; Singhal, Himshikha; Kumar, Puneet; Kaur, Dalbir; Kaur, Maninder; Rana, Pawan Kumar; Gupta, Raghbir Chand

doi:10.1080/00087114.2017.1344084

Cited by 4 publications

(4 citation statements)

References 33 publications

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“…The genus underwent several descending dysploidies leading to the recurrent formation of dysploid cytotypes (from 2 n = 40 to 38) and speciation (cf. Blöch et al 2009 ; Moraes et al 2016 ; Singhal et al 2017 ; Melichárková et al 2020 ). Although descending dysploidy can act as an instant reproduction barrier between the newly formed dysploid and its euploid parental cytotype ( Mandáková and Lysak 2018 ; Winterfeld et al 2018 ), hybridization events between dysploid and euploid Soldanella species were revealed by our analyses ( Fig.…”

Section: Discussionmentioning

confidence: 99%

Pervasive Introgression During Rapid Diversification of the European Mountain Genus Soldanella (L.) (Primulaceae)

et al. 2022

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Hybridization is a key mechanism involved in lineage diversification and speciation, especially in ecosystems that experienced repeated environmental oscillations. Recently radiated plant groups, which have evolved in mountain ecosystems impacted by historical climate change provide an excellent model system for studying the impact of gene flow on speciation. We combined organellar (whole plastome) and nuclear genomic data (RAD-seq) with a cytogenetic approach (rDNA FISH) to investigate the effects of hybridization and introgression on evolution and speciation in the genus Soldanella (snowbells, Primulaceae). Pervasive introgression has already occurred among ancestral lineages of snowbells and has persisted throughout the entire evolutionary history of the genus, regardless of the ecology, cytotype, or distribution range size of the affected species. The highest extent of introgression has been detected in the Carpathian species, which is also reflected in their extensive karyotype variation. Introgression occurred even between species with dysploid and euploid cytotypes, which were considered to be reproductively isolated. The magnitude of introgression detected in snowbells is unprecedented in other mountain genera of the European Alpine System investigated hitherto. Our study stresses the prominent evolutionary role of hybridization in facilitating speciation and diversification on the one hand, but also enriching previously isolated genetic pools.

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Section: Discussionmentioning

confidence: 99%

Pervasive Introgression During Rapid Diversification of the European Mountain Genus Soldanella (L.) (Primulaceae)

et al. 2022

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“…Chromosome numbers of both 2n = 20 and 2n = 18 have been reported from multiple locations in both the native and invaded ranges (Singhal et al 2017;Song et al 2003, and references therein), with a 2C DNA content of 2.2-2.3 pg for plants with 2n = 18 (Fitter and Peat, 1994).…”

Section: Genetic Datamentioning

confidence: 99%

Biological flora of Central Europe: Impatiens glandulifera Royle

Helsen

Diekmann

Decocq

et al. 2021

Perspectives in Plant Ecology, Evolution and Systematics

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“…Slovák et al., 2023; Štubňová et al., 2017). The recurrent emergence of dysploid cytotypes has been considered a major driver of diversification and speciation in various plant groups (e.g., Blöch et al., 2009; Moraes et al., 2016; Singhal et al., 2017). In contrast to numerous plant lineages (Melichárková et al., 2020; Singhal et al., 2017), each emergence of dysploid cytotype in snowbells led to a speciation event.…”

Section: Discussionmentioning

confidence: 99%

“…The recurrent emergence of dysploid cytotypes has been considered a major driver of diversification and speciation in various plant groups (e.g., Blöch et al., 2009; Moraes et al., 2016; Singhal et al., 2017). In contrast to numerous plant lineages (Melichárková et al., 2020; Singhal et al., 2017), each emergence of dysploid cytotype in snowbells led to a speciation event. Chorological and ecological observations indicate that the evolution of dysploid cytotype is primarily associated with forest environments and mid‐altitudinal zones (Kochjarová et al., 2017; Valachovič et al., 2019; Zhang & Kadereit, 2002).…”

Section: Discussionmentioning

confidence: 99%

Homoplastic versus xenoplastic evolution: exploring the emergence of key intrinsic and extrinsic traits in the montane genus Soldanella (Primulaceae)

Rurik,

Melichárková,

Gbúrová Štubová

et al. 2024

The Plant Journal

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SUMMARYSpecific ecological conditions in the high mountain environment exert a selective pressure that often leads to convergent trait evolution. Reticulations induced by incomplete lineage sorting and introgression can lead to discordant trait patterns among gene and species trees (hemiplasy/xenoplasy), providing a false illusion that the traits under study are homoplastic. Using phylogenetic species networks, we explored the effect of gene exchange on trait evolution in Soldanella, a genus profoundly influenced by historical introgression. At least three features evolved independently multiple times: the single‐flowered dwarf phenotype, dysploid cytotype, and ecological generalism. The present analyses also indicated that the recurring occurrence of stoloniferous growth might have been prompted by an introgression event between an ancestral lineage and a still extant species, although its emergence via convergent evolution cannot be completely ruled out. Phylogenetic regression suggested that the independent evolution of larger genomes in snowbells is most likely a result of the interplay between hybridization events of dysploid and euploid taxa and hostile environments at the range margins of the genus. The emergence of key intrinsic and extrinsic traits in snowbells has been significantly impacted not only by convergent evolution but also by historical and recent introgression events.

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A profile of male meiosis, chromosomal variation and status in species ofImpatiensfrom North-West Himalaya in India

Cited by 4 publications

References 33 publications

Pervasive Introgression During Rapid Diversification of the European Mountain Genus Soldanella (L.) (Primulaceae)

Pervasive Introgression During Rapid Diversification of the European Mountain Genus Soldanella (L.) (Primulaceae)

Biological flora of Central Europe: Impatiens glandulifera Royle

Homoplastic versus xenoplastic evolution: exploring the emergence of key intrinsic and extrinsic traits in the montane genus Soldanella (Primulaceae)

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