Speeding up chromosome evolution in Phaseolus: multiple rearrangements associated with a one-step descending dysploidy

Fonsêca, Artur; Ferraz, Maria Eduarda; Pedrosa‐Harand, Andrea

doi:10.1007/s00412-015-0548-3

Cited by 31 publications

(25 citation statements)

References 41 publications

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“…Recurring NCIs were common during grass genome evolution as the prevailing mechanism of DD (Luo et al ., ; International Brachypodium Initiative ; Betekhtin et al ., ), but have been only rarely reported in other angiosperm families (Cucurbitaceae: Yang et al ., ; Fabaceae: Fonsêca et al ., ). In Brassicaceae, few NCI events were described, e.g.…”

Section: Discussionmentioning

confidence: 97%

Hybridization‐facilitated genome merger and repeated chromosome fusion after 8 million years

et al. 2018

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The small genus Ricotia (nine species, Brassicaceae) is confined to the eastern Mediterranean. By comparative chromosome painting and a dated multi-gene chloroplast phylogeny, we reconstructed the origin and subsequent evolution of Ricotia. The ancestral Ricotia genome originated through hybridization between two older genomes with n = 7 and n = 8 chromosomes, respectively, on the Turkish mainland during the Early Miocene (c. 17.8 million years ago, Ma). Since then, the allotetraploid (n = 15) genome has been altered by two independent descending dysploidies (DD) to n = 14 in Ricotia aucheri and the Tenuifolia clade (2 spp.). By the Late Miocene (c. 10 Ma), the latter clade started to evolve in the most diverse Ricotia core clade (6 spp.), the process preceded by a DD event to n = 13. It is noteworthy that this dysploidy was mediated by a unique chromosomal rearrangement, merging together the same two chromosomes as were merged during the origin of a fusion chromosome within the paternal n = 7 genome c. 20 Ma. This shows that within a time period of c. 8 Myr genome evolution can repeat itself and that structurally very similar chromosomes may originate repeatedly from the same ancestral chromosomes by different pathways (end-to-end translocation versus nested chromosome insertion).

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Section: Discussionmentioning

confidence: 97%

Hybridization‐facilitated genome merger and repeated chromosome fusion after 8 million years

et al. 2018

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“…Dysploidy can cause increases or decreases in basic chromosome numbers through chromosome fission or fusion, respectively. Nested chromosome fusion that can cause basic chromosome number decrease have been reported recently 30 . However, all the plants used in these studies had already formed different basic chromosome numbers in their genus or species.…”

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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“…Figures 8IIIC–E ). The presence of chromosome fusion and fission rearrangements is postulated to be one of the important forces that shape the structure of plant karyotypes, as demonstrated by FISH in Brachypodium (Wolny et al, 2011 ) Cardamine (Mandáková et al, 2013 ) and Phaseolus (Fonseca et al, 2016 ). This phenomenon has been extensively studied in grasses, cereals in particular (Salse and Feuillet, 2011 ), and also in other plants, including some legumes (Murat et al, 2015 ).…”

Section: Discussionmentioning

confidence: 99%

A First Glimpse of Wild Lupin Karyotype Variation As Revealed by Comparative Cytogenetic Mapping

et al. 2016

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Insight into plant genomes at the cytomolecular level provides useful information about their karyotype structure, enabling inferences about taxonomic relationships and evolutionary origins. The Old World lupins (OWL) demonstrate a high level of genomic diversification involving variation in chromosome numbers (2n = 32–52), basic chromosome numbers (x = 5–7, 9, 13) and in nuclear genome size (2C DNA = 0.97–2.68 pg). Lupins comprise both crop and wild species and provide an intriguing system to study karyotype evolution. In order to investigate lupin chromosome structure, heterologous FISH was used. Sixteen BACs that had been generated as chromosome markers for the reference species, Lupinus angustifolius, were used to identify chromosomes in the wild species and explore karyotype variation. While all “single-locus” in L. angustifolius, in the wild lupins these clones proved to be “single-locus,” “single-locus” with additional signals, “repetitive” or had no detectable BAC-FISH signal. The diverse distribution of the clones in the targeted genomes suggests a complex evolution history, which possibly involved multiple chromosomal changes such as fusions/fissions and repetitive sequence amplification. Twelve BACs were sequenced and we found numerous transposable elements including DNA transposons as well as LTR and non-LTR retrotransposons with varying quantity and composition among the different lupin species. However, at this preliminary stage, no correlation was observed between the pattern of BAC-FISH signals and the repeat content in particular BACs. Here, we describe the first BAC-based chromosome-specific markers for the wild species: L. cosentinii, L. cryptanthus, L. pilosus, L. micranthus and one New World lupin, L. multiflorus. These BACs could constitute the basis for an assignment of the chromosomal and genetic maps of other lupins, e.g., L. albus and L. luteus. Moreover, we identified karyotype variation that helps illustrate the relationships between the lupins and the extensive cytological diversity within this group. In this study we premise that lupin genomes underwent at least two rounds of fusion and fission events resulting in the reduction in chromosome number from 2n = 52 through 2n = 40 to 2n = 32, followed by chromosome number increment to 2n = 42.

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Speeding up chromosome evolution in Phaseolus: multiple rearrangements associated with a one-step descending dysploidy

Cited by 31 publications

References 41 publications

Hybridization‐facilitated genome merger and repeated chromosome fusion after 8 million years

Hybridization‐facilitated genome merger and repeated chromosome fusion after 8 million years

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

A First Glimpse of Wild Lupin Karyotype Variation As Revealed by Comparative Cytogenetic Mapping

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