Impact of dysploidy and polyploidy on the diversification of high mountain Artemisia (Asteraceae) and allies

Xaxars, Gemma Mas de; Garnatje, Teresa; Pellicer, Jaume; Šiljak-Yakovlev, Sonja; Vallès, Joan; Garcia, Sònia

doi:10.1007/s00035-015-0159-x

Cited by 27 publications

(21 citation statements)

References 60 publications

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“…Polyploidy, dysploidy, and aneuploidy are thought to have played important roles in the karyotype evolution of eukaryotes 28 , 29 . Dysploidy can cause increases or decreases in basic chromosome numbers through chromosome fission or fusion, respectively.…”

Section: Discussionmentioning

confidence: 99%

FISH-based mitotic and meiotic diakinesis karyotypes of Morus notabilis reveal a chromosomal fusion-fission cycle between mitotic and meiotic phases

Xuan¹,

et al. 2017

Sci Rep

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Mulberry (Morus spp.), in family Moraceae, is a plant with important economic value. Many polyploid levels of mulberry have been determined. In the present study, the fluorescence in situ hybridization (FISH) technique was applied in Morus notabilis, using four single-copy sequences, telomere repeats, and 5S and 25S rDNAs as probes. All the mitotic chromosomes were clearly identified and grouped into seven pairs of homologous chromosomes. Three dot chromosome pairs were distinguished by the FISH patterns of the 25S rDNA probe and a simple sequence repeat (SSR2524). According to the FISH signals, chromosome length and morphology, detailed meiotic diakinesis karyotype was constructed. Interestingly, only six bivalent chromosomes were observed in diakinesis cells. The 25S rDNA probe was used to illustrate chromosome alterations. The results indicated that mitotic chromosomes 5 and 7 fused into diakinesis chromosome 5 during the meiotic phase. In mitotic cells, the fused chromosome 5 broke into chromosomes 5 and 7. A chromosomal fusion-fission cycle between the meiotic and mitotic phases in the same individual is reported here for the first time. This finding will contribute to the understanding of karyotype evolution in plants.

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Section: Discussionmentioning

confidence: 99%

FISH-based mitotic and meiotic diakinesis karyotypes of Morus notabilis reveal a chromosomal fusion-fission cycle between mitotic and meiotic phases

Xuan¹,

et al. 2017

Sci Rep

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“…We also demonstrate a strong association between reduction in chromosome number and evolution of the short‐lived life‐history. Mas de Xaxars et al () hypothesized that dysploidy could be related to adaptation of plants to extreme habitats. Galbany‐Casals et al () previously argued that dysploidy could be an adaptation to aridity in Helichrysum .…”

Section: Discussionmentioning

confidence: 99%

Evolutionary history of the arid climate‐adapted Helichrysum (Asteraceae: Gnaphalieae): Cape origin and association between annual life‐history and low chromosome numbers

Andrés‐Sánchez

Verboom

Galbany‐Casals

et al. 2019

J of Sytematics Evolution

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The basal grade of the large, widely-distributed Helichrysum-Anaphalis-Pseudognaphalium (HAP) clade (Asteraceae, Gnaphalieae) comprises exclusively southern African taxa. These species possess unusual trait combinations relative to the remaining species (a high proportion of annuals, unusual capitulum arrangement, and low base chromosome numbers). A time-proportional Bayesian phylogenetic hypothesis is generated from nuclear ribosomal sequences from 110 accessions. Ancestral area, life history, and base chromosome number are reconstructed using maximum likelihood, and correlations between life-history and chromosome number are tested in a phylogenetic framework. The results show that the HAP clade probably originated and experienced initial diversification in the Greater Cape Floristic Region in the Early to Middle Miocene. The ancestor of the HAP clade is inferred to have been perennial with x ¼ 7 base chromosome number. Several independent acquisitions of the annual life-history are inferred, accompanied by reductions to x ¼ 4 and 5. A single reversal to perennial life history is associated with a subsequent change back to the state of x ¼ 7. Origin and early diversification within the HAP clade follows the pattern of multi-area seeded radiations within southern Africa, with subsequent migrations to the rest of Africa and the Northern Hemisphere. Occupation of drier habitats with shorter growing seasons may select for the acquisition of a shorter life-cycle, and our results indicate a strong association between short life-cycle and reduced chromosome number.

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“…Indels longer than 1 bp were re-coded as single base pairs and single base pair gaps were then treated as a fifth character state in the analyses. Artemisia absinthium L. was used as outgroup based on previous phylogenetic studies (Sanz et al, 2008;Mas de Xaxars et al, 2016).…”

Section: Plastid Dna Analysismentioning

confidence: 99%

“…×fragosoana Font Quer) has been described (Martínez Lirola et al, 2000). Artemisia umbelliformis is hypotetraploid (2n = 4x = 34) throughout its entire distribution area (Oliva & Vallès, 1994;Mas de Xaxars et al, 2016) and belongs to the alpine dysploid-polyploid informal Leucophorae group (Gutermann, 1979;Ehrendorfer, 1980).…”

Section: Introductionmentioning

confidence: 99%

Glacial survival in and recent long-distance dispersal to the Iberian Mountains: the phylogeographic history of Artemisia umbelliformis (Asteraceae)

Sanz

Schönswetter

Vallès

et al. 2017

Botanical Journal of the Linnean Society

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Artemisia umbelliformis is a herbaceous perennial alpine plant growing in the central and western part of the European Alpine system (Sierra Nevada, Cantabrian Mountains, Pyrenees, Alps and Apennines). We aimed to unravel the large-scale phylogeographic structure within its entire distribution. To this end, we collected AFLP and plastid DNA sequence data for 19 populations covering the entire distributional range of the species. Populations were strongly reciprocally differentiated with 93% of the overall genetic variation partitioned among populations. Bayesian clustering approaches identified two groups, the Alpine group spanning the Alps, the Apennines and the Sierra Nevada, and the North Iberian group including populations from the Pyrenees and the Cantabrian Mountains. The three plastid haplotypes discovered fell into two strongly divergent clades, termed Iberian and Alpine lineages. At the range-wide scale, our results suggest that an early vicariance or, alternatively, an old dispersal event shaped the strong phylogeographic split between Iberian and Alpine populations. Genetic drift caused by highly restricted gene flow between the populations has likely resulted in reduced genetic variability and strong divergence between populations. The Alps, the central Pyrenees, the Cantabrian Mountains and the northern Apennines probably acted as glacial refugia for A. umbelliformis. By contrast, the single population occurring in the Sierra Nevada appears to originate from a fairly recent long-distance dispersal event from the southern middle Alps. Altogether, our study shows that the phylogeographic history of A. umbelliformis is complex and has been shaped by processes acting at different time horizons.These processes conferred genetic relationships among disjunct populations, which partly reflected geographic proximity and partly spanned very distant mountain ranges such as Alps and Sierra Nevada. ADDITIONAL

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Impact of dysploidy and polyploidy on the diversification of high mountain Artemisia (Asteraceae) and allies

Abstract: 16Molecular cytogenetics and the study of genome size have been used to understand 17 evolutionary and systematic relationships in many species. However, this approach has seldom 39

Cited by 27 publications

References 60 publications

FISH-based mitotic and meiotic diakinesis karyotypes of Morus notabilis reveal a chromosomal fusion-fission cycle between mitotic and meiotic phases

FISH-based mitotic and meiotic diakinesis karyotypes of Morus notabilis reveal a chromosomal fusion-fission cycle between mitotic and meiotic phases

Evolutionary history of the arid climate‐adapted Helichrysum (Asteraceae: Gnaphalieae): Cape origin and association between annual life‐history and low chromosome numbers

Glacial survival in and recent long-distance dispersal to the Iberian Mountains: the phylogeographic history of Artemisia umbelliformis (Asteraceae)

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