Variable patterns of chromosome synapsis at pachytene in Hordeum vulgarexH. bulbosum hybrids and their parents

Zhang, Liangtao; Murray, B. G.; Pickering, R. A.

doi:10.1034/j.1601-5223.2002.01549.x

Cited by 7 publications

(5 citation statements)

References 35 publications

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“…As such, our rainbow trout and Arctic charr male mapping parents may express a higher degree of recombination within their genomes as a result of hybridization events in recent generations (Woram et al 2004). Elevated levels of recombination have been reported in hybrid lines of Hordeum (Zhang et al 2002) and Helianthus (Rieseberg et al 1999) and reinforce the observation that enhanced recombination rates may be a general feature of new contact genomes undergoing a transition to a more established lower rate of recombination. This sorting process may also be enhanced by forced changes in selection regimes within populations (Korol et al 1994) and since hybridized genomes are often a consequence of population intermixing concurrent with expansion into new habitats, it is still unclear whether elevated levels of recombination are a consequence of increased incompatibilities in the genic architecture associated with chromosome pairing during meiosis (Schwarzacher 2003) or specific gene level interactions that facilitate adaptation to new environmental conditions.…”

Section: Recombination Differencessupporting

confidence: 58%

A comparative analysis of the rainbow trout genome with 2 other species of fish (Arctic charr and Atlantic salmon) within the tetraploid derivative Salmonidae family (subfamily: Salmoninae)

Danzmann

Cairney²,

Davidson³

et al. 2005

Genome

117

196

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We updated the genetic map of rainbow trout (Oncorhynchus mykiss) for 2 outcrossed mapping panels, and used this map to assess the putative chromosome structure and recombination rate differences among linkage groups. We then used the rainbow trout sex-specific maps to make comparisons with 2 other ancestrally polyploid species of salmonid fishes, Arctic charr (Salvelinus alpinus) and Atlantic salmon (Salmo salar) to identify homeologous chromosome affinities within each species and ascertain homologous chromosome relationships among the species. Salmonid fishes exhibit a wide range of sex-specific differences in recombination rate, with some species having the largest differences for any vertebrate species studied to date. Our current estimate of female:male recombination rates in rainbow trout is 4.31:1. Chromosome structure and (or) size is associated with recombination rate differences between the sexes in rainbow trout. Linkage groups derived from presumptive acrocentric type chromosomes were observed to have much lower sex-specific differences in recombination rate than metacentric type linkage groups. Arctic charr is karyotypically the least derived species (i.e., possessing a high number of acrocentric chromosomes) and Atlantic salmon is the most derived (i.e., possessing a number of whole-arm fusions). Atlantic salmon have the largest female:male recombination ratio difference (i.e., 16.81:1) compared with rainbow trout, and Arctic charr (1.69:1). Comparisons of recombination rates between homologous segments of linkage groups among species indicated that when significant experiment-wise differences were detected (7/24 tests), recombination rates were generally higher in the species with a less-derived chromosome structure (6/7 significant comparisons). Greater similarity in linkage group syntenies were observed between Atlantic salmon and rainbow trout, suggesting their closer phylogenetic affinities, and most interspecific linkage group comparisons support a model that suggests whole chromosome arm translocations have occurred in the evolution of this group. However, some possible exceptions were detected and these findings are discussed in relation to their influence on segregation distortion patterns. We also report unusual meiotic segregation patterns in a female parent involving the duplicated (homeologous) linkage group pair 12/16 and discuss several models that may account for these patterns.

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Section: Recombination Differencessupporting

confidence: 58%

A comparative analysis of the rainbow trout genome with 2 other species of fish (Arctic charr and Atlantic salmon) within the tetraploid derivative Salmonidae family (subfamily: Salmoninae)

Danzmann

Cairney²,

Davidson³

et al. 2005

Genome

117

196

View full text Add to dashboard Cite

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“…This statement can now be extended to higher plants, since we obtained comparable results in A. thaliana. Such correlated variations in SC length and CO number were also reported among chromosomes in one sex only, among individuals in the same species, and even among meiocytes in a single organism [5,17,[47][48][49][50]. However, based on current knowledge it is difficult to claim that SC length determines CO number, if the reverse is true, or even if another unidentified factor determines both.…”

Section: Discussionmentioning

confidence: 83%

Sex-specific crossover distributions and variations in interference level along Arabidopsis thaliana chromosome 4

Drouaud¹,

Mercier²,

Chelysheva³

et al. 2005

PLoS Genet

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In many species, sex-related differences in crossover (CO) rates have been described at chromosomal and regional levels. In this study, we determined the CO distribution along the entire Arabidopsis thaliana Chromosome 4 (18 Mb) in male and female meiosis, using high density genetic maps built on large backcross populations (44 markers, .1,300 plants). We observed dramatic differences between male and female map lengths that were calculated as 88 cM and 52 cM, respectively. This difference is remarkably parallel to that between the total synaptonemal complex lengths measured in male and female meiocytes by immunolabeling of ZYP1 (a component of the synaptonemal complex). Moreover, CO landscapes were clearly different: in particular, at both ends of the map, male CO rates were higher (up to 4-fold the mean value), whereas female CO rates were equal or even below the chromosomal average. This unique material gave us the opportunity to perform a detailed analysis of CO interference on Chromosome 4 in male and female meiosis. The number of COs per chromosome and the distances between them clearly departs from randomness. Strikingly, the interference level (measured by coincidence) varied significantly along the chromosome in male meiosis and was correlated to the physical distance between COs. The significance of this finding on the relevance of current CO interference models is discussed.

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“…In this paper we extend that study and present the MI-association frequencies of identifiable chromosome arms using fluorescent in situ hybridisation (FISH) on pollen mother cells (PMCs) of a diploid H. vulgare × H. bulbosum hybrid. The hybrid, 102C2, has been extensively investigated previously (Zhang et al 1999(Zhang et al , 2002 and, following colchicine treatment to double its chromosome number and restore fertility, has provided breeders with agronomically useful RLs (Zhang et al 2001).…”

Section: Introductionmentioning

confidence: 99%

Reduced metaphase I associations between the short arms of homoeologous chromosomes in a Hordeum vulgare L. � H. bulbosum L. diploid hybrid influences the frequency of recombinant progeny

et al. 2004

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Hordeum vulgare (cultivated barley) x H. bulbosum (bulbous barley grass) hybrids have been used to obtain disease-resistant recombinant lines (RLs). The RLs contain chromatin transferred from the wild species mostly onto the long arms of recipient barley chromosomes. To determine whether differences in meiotic metaphase I (MI) associations between the long and short arms of homologous chromosomes can account for the preponderance of introgressions on the long arms, we carried out fluorescent in situ hybridisation on MI chromosome preparations obtained from pollen mother cells of a diploid interspecific hybrid. By using various probes, we established that MI associations between the long arms occurred more frequently than between the short arms for the five chromosomes tested.

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Variable patterns of chromosome synapsis at pachytene in Hordeum vulgarexH. bulbosum hybrids and their parents

Cited by 7 publications

References 35 publications

A comparative analysis of the rainbow trout genome with 2 other species of fish (Arctic charr and Atlantic salmon) within the tetraploid derivative Salmonidae family (subfamily: Salmoninae)

A comparative analysis of the rainbow trout genome with 2 other species of fish (Arctic charr and Atlantic salmon) within the tetraploid derivative Salmonidae family (subfamily: Salmoninae)

Sex-specific crossover distributions and variations in interference level along Arabidopsis thaliana chromosome 4

Reduced metaphase I associations between the short arms of homoeologous chromosomes in a Hordeum vulgare L. � H. bulbosum L. diploid hybrid influences the frequency of recombinant progeny

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