Structural variability and chromosome numbers variation in natural populations ofScilla autumnalis (Liliaceae)

Guillén, Alfredo; Rejón, M. Ruíz

doi:10.1007/bf00984133

Cited by 8 publications

(5 citation statements)

References 11 publications

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“…Indeed, beside B-typical numerical polymorphisms, there are several cases of B structural polymorphisms in plants, e.g. in Brachycome dichromosomatica (Houben et al, 1999), in Scilla autumnalis (Guillen and Rejon, 1984;Parker et al, 1991), in Allium schoenoprasum (Bougourd and Parker, 1979), in Aegilops mutica (Mochizuki, 1960) and in animals such as the grasshopper Eyprepocnemis plorans (Bakkali et al, 1999;Cabrero et al, 1999;Bakkali and Camacho, 2004).…”

Section: Introductionmentioning

confidence: 99%

B chromosomes of rye are highly conserved and accompanied the development of early agriculture

et al. 2013

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Section: Introductionmentioning

confidence: 99%

B chromosomes of rye are highly conserved and accompanied the development of early agriculture

et al. 2013

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“…Bs, highly variable in structure and heterochromatin composition, have previously been reported in diploids and polyploids of P. autumnale (Ruiz Rej on et al, 1980;Parker et al, 1991;Ebert, 1993;Taylor, 1997) and the Bs in the current study represent a subset of those described. Telocentrics, acrocentrics and metacentrics have previously been documented (Ruiz Rej on et al, 1980;Hong, 1982;Guill en & Ruiz Rej on, 1984;Parker et al, 1991;Ebert et al, 1996), but no telocentrics were included in the current sample. As many as 11 B types were observed based on B morphology but mainly on the distribution of tandem repeats in the Bs (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…They are usually smaller than the standard complement and vary in size from dot-like micro-Bs (Houben et al, 1997(Houben et al, , 2013Jones et al, 2008) to chromosomes as large as the smallest chromosomes of the regular set (Jones et al, 2008). Their size and structure are often stable within taxa (Secale cereale: Marques et al, 2012Marques et al, , 2013, but plants carrying more than one structural B type are well known (Guill en & Ruiz Rej on, 1984;Parker et al, 1991).…”

Section: Introductionmentioning

confidence: 99%

Structural polymorphisms and distinct genomic composition suggest recurrent origin and ongoing evolution of B chromosomes in the Prospero autumnale complex (Hyacinthaceae)

2015

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Summary Supernumerary B chromosomes (Bs) are genomic parasitic components, originating from the A complement via chromosomal rearrangements, which follow their own evolutionary trajectories. They often contain repetitive DNAs, some shared with regular chromosomes and some newly evolved. Genomic composition, origin and evolution of Bs have been analysed in the chromosomally variable Prospero autumnale complex.Two rDNAs and a satellite DNA (PaB6) from regular chromosomes were mapped to Bs of 26 plants from three diploid cytotypes, their hybrids and polyploid derivatives. In homoploid diploid hybrids, genomic in situ hybridization (GISH) allowed B painting with the parental DNAs.Bs were structurally variable and highly enriched in 5S rDNA and satDNA PaB6, and rarely in 35S rDNA. Eleven combinations of rDNA and PaB6 localization were observed. The quantities of PaB6 in Bs and regular chromosomes were not correlated, suggesting amplification mechanisms other than recombination. PaB6 and 5S rDNA amounts increased with increasing ploidy level. GISH revealed two independent origins of Bs.The structural variation, repeat content, repeat‐type fluctuations and differing genomic affinities of Bs in different cytotypes suggest that they represent young proto‐B chromosomes. Bs in P. autumnale probably form recurrently as by‐products of the extensive genome restructuring within this chromosomally variable species complex.

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“…To get a longer scope of B chromosome evolution in Cuesta de la Palma population, we also included two samples from this same population analyzed in 1981 (Oliver et al. ) and 1983 (Guillén and Ruiz‐Rejón ). In the 1981 sample, the B chromosomes found showed mitotic instability and the authors only scored the presence/absence of B chromosomes, for which reason only B prevalence can be calculated.…”

Section: Methodsmentioning

confidence: 99%

“…,b; Oliver et al. ; Guillen and Ruiz‐Rejón ; Parker et al. ), who found several B‐carrying populations with a remarkable effect on the activation of an esterase gene (Ruiz Rejón et al.…”

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confidence: 99%

Long-term monitoring of B-chromosome invasion and neutralization in a population ofProspero autumnale(Asparagaceae)

et al. 2018

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B chromosomes have been reported in about 15% of eukaryotes, but long-term dynamics of B chromosomes in a single natural population has rarely been analyzed. Prospero autumnale plants collected in 1981 and 1983 at Cuesta de La Palma population had shown the presence of B chromosomes. We analyze here seven additional samples collected between 1987 and 2015, and show that B frequency increased significantly during the 1980s and showed minor fluctuations between 2005 and 2015. A mother-offspring analysis of B chromosome transmission, at population level, showed significant drive on the male side (k = 0.65) and significant drag on the female side (k = 0.33), with average B transmission rate being very close to the Mendelian rate (0.5). No significant effects of B chromosomes were observed on a number of vigor and fertility-related traits. Within a parasite/host framework, these results suggest that B chromosomes' drive on the male side is the main pathway for B chromosome invasion, whereas B chromosome drag on the female side might be the main manifestation of host genome resistance in this species. Prospero autumnale thus illuminates a novel evolutionary pathway for B chromosome neutralization by means of a decrease in B transmission through the nondriving sex.

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Structural variability and chromosome numbers variation in natural populations ofScilla autumnalis (Liliaceae)

Cited by 8 publications

References 11 publications

B chromosomes of rye are highly conserved and accompanied the development of early agriculture

B chromosomes of rye are highly conserved and accompanied the development of early agriculture

Structural polymorphisms and distinct genomic composition suggest recurrent origin and ongoing evolution of B chromosomes in the Prospero autumnale complex (Hyacinthaceae)

Long-term monitoring of B-chromosome invasion and neutralization in a population ofProspero autumnale(Asparagaceae)

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