Robertsonian fusion and centric fission in karyotype evolution of higher plants

Jones, Keith

doi:10.1007/bf02856567

Cited by 88 publications

(90 citation statements)

References 56 publications

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“…1998). Such observations have been seen in other lineages of the monocots, such as Commelinaceae, in which Robertsonian changes are well known (Jones 1998). A similar pattern is found in Asphodelaceae, in which DNA amounts vary twofold just among diploid species of Aloe with the same number of chromosomes (Brandham and Doherty 1998).…”

Section: Mitochondrial Evolution and Telomere Composition Insupporting

confidence: 74%

Phylogeny, Genome Size, and Chromosome Evolution of Asparagales

Pires¹,

Maureira²,

Givnish³

et al. 2006

aliso

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Asparagales are a diverse monophyletic order that has numerous species (ca. 50% of monocots) including important crop plants such as Allium, Asparagus, and Vanilla, and a host of ornamentals such as irises, hyacinths, and orchids. Historically, Asparagales have been of interest partly because of their fascinating chromosomal evolution. We examine the evolutionary dynamics of Asparagales genomes in an updated phylogenetic framework that combines analyses of seven gene regions (atpl, atpB, matK, ndhF, rbcL, trnL intron, and trnL-F intergenic spacer) for 79 taxa of Asparagales and outgroups. Asparagales genomes are evolutionarily labile for many characters, including chromosome number and genome size. The history and causes of variation in chromosome number and genome size remain unclear, primarily because of the lack of data in small clades in the phylogenetic tree and the lack of comparative genetic maps, apart from Allium and Asparagus. Genomic tools such as bacterial artificial chromosome (BAC) libraries should be developed, as both molecular cytogenetic markers and a source of nuclear genes that can be widely used by evolutionary biologists and plant breeders alike to decipher mechanisms of chromosomal evolution.

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Section: Mitochondrial Evolution and Telomere Composition Insupporting

confidence: 74%

Phylogeny, Genome Size, and Chromosome Evolution of Asparagales

Pires¹,

Maureira²,

Givnish³

et al. 2006

aliso

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“…Such centromere repositioning events, accompanied by a shift in the centromere-associated tandem DNA repeat, appear to have been important in chromosome number evolution within the cucurbits (Han et al, 2009). Nonetheless, polyploidy has been concluded to be the major source of chromosome number increases in plants (Jones, 1998), except in a few odd lineages such as Zamia (Olson and Gorelick, 2011), slipper orchids (Cox et al, 1998) and sedges (Chung et al, 2012). In sedges, which have holocentric chromosomes, fission may be common in part because the lack of localized centromeres allows breakage anywhere along a chromosome with relatively low risks of meiotic dysfunction (Chung et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

“…Closely related taxa often differ by a least a few structural rearrangements, and more distantly related taxa within genera often differ in chromosome number as well. In plants, polyploidy is an important source of chromosomal change, and doublings or near-doublings in chromosome number within families are often assumed to result from tetraploidy events (Jones, 1998;Wood et al, 2009). Nonetheless, changes in chromosome number between sister lineages may also occur by chromosome fission and fusion (Schubert and Lysak, 2011).…”

Section: Introductionmentioning

confidence: 99%

Comparative linkage maps suggest that fission, not polyploidy, underlies near-doubling of chromosome number within monkeyflowers (Mimulus; Phrymaceae)

Fishman

et al. 2014

Heredity

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Changes in chromosome number and structure are important contributors to adaptation, speciation and macroevolution. In flowering plants, polyploidy and subsequent reductions in chromosome number by fusion are major sources of chromosomal evolution, but chromosome number increase by fission has been relatively unexplored. Here, we use comparative linkage mapping with gene-based markers to reconstruct chromosomal synteny within the model flowering plant genus Mimulus (monkeyflowers). Two sections of the genus with haploid numbers X14 have been inferred to be relatively recent polyploids because they are phylogenetically nested within numerous taxa with low base numbers (n ¼ 8-10). We combined multiple data sets to build integrated genetic maps of the M. guttatus species complex (section Simiolus, n ¼ 14) and the M. lewisii group (section Erythranthe; n ¼ 8), and then aligned the two integrated maps using 4100 shared markers. We observed strong segmental synteny between M. lewisii and M. guttatus maps, with essentially 1-to-1 correspondence across each of 16 chromosomal blocks. Assuming that the M. lewisii (and widespread) base number of 8 is ancestral, reconstruction of 14 M. guttatus chromosomes requires at least eight fission events (likely shared by Simiolus and sister section Paradanthus (n ¼ 16)), plus two fusion events. This apparent burst of fission in the yellow monkeyflower lineages raises new questions about mechanisms and consequences of chromosomal fission in plants. Our comparative maps also provide insight into the origins of a chromosome exhibiting centromere-associated female meiotic drive and create a framework for transferring M. guttatus genome resources across the entire genus.

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“…This result suggests that the Robertsonian translocation between 2 smaller chromosomes may have occurred during the evolution of Bixa. Robertsonian interchange is characterized by centromeric fusion (Jones 1998, Zhang et al 2001, Oakey and Beechey 2002, Switonski et al 2003 between 2 acrocentric (Gupta and Gupta 1991) or telocentric (Zhang et al 2001) non-homologous chromosomes, resulting in one metacentric chromosome (Gupta and Gupta 1991, Jones 1998, Zhang et al 2001, Oakey and Beechey 2002. Considering that many species present the SC in the distal portion of the short arm (Leitch and HeslopHarrison 1992, Hanson et al 1996, Liu et al 1997) and the morphometric data of the chromosome 1, a break involving the long arm of 1 chromosome and the short arm of the other probably led to the formation of the metacentric chromosome 1 with the SC adjacent to the centromere, during the genomic evolution of these species.…”

Section: Discussionmentioning

confidence: 99%

Classical and Molecular Cytogenetic Tools to Resolve the Bixa Karyotypes

Almeida

Carvalho

2006

CYTOLOGIA

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SummaryThe cytogenetic studies performed in Bixa orellana have reported 2nϭ14 or 2nϭ16 chromosomes with little karyotypic information. In this context, an improved cytogenetic protocol using enzymatic maceration of meristematic cellular walls and digital image analysis was applied to B. orellana and B. arborea. In B. arborea, the high-resolution technique, Ag-NOR and C banding methods, and FISH using a probe of 45S rDNA genes, were also performed. Prometaphasic and standard C-metaphasic chromosomes presented well-defined primary and secondary constrictions facilitated the pairing of homologues and assembly of the karyogram for the 2 species. These species showed similar karyotypes with 2nϭ14 chromosomes, being composed of 5 metacentric pairs (1, 2, 3, 4 and 6) and 2 submetacentric pairs (5 and 7). The chromosome 1 is approximately 2 times as long as the others and possesses the secondary constriction adjacent to the centromere, which suggests that Robertsonian translocation between 2 smaller chromosomes may have occurred during the karyotype evolution of Bixa. Additionally, the active NOR, the NOR-adjacent heterochromatic region and 18S, 5.8S and 26S rDNA genes were identified in the secondary constriction of chromosome 1.

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Robertsonian fusion and centric fission in karyotype evolution of higher plants

Cited by 88 publications

References 56 publications

Phylogeny, Genome Size, and Chromosome Evolution of Asparagales

Phylogeny, Genome Size, and Chromosome Evolution of Asparagales

Comparative linkage maps suggest that fission, not polyploidy, underlies near-doubling of chromosome number within monkeyflowers (Mimulus; Phrymaceae)

Classical and Molecular Cytogenetic Tools to Resolve the Bixa Karyotypes

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