scholarly journals Segmental allopolyploidy in action: Increasing diversity through polyploid hybridization and homoeologous recombination

2018 ◽  
Vol 105 (6) ◽  
pp. 1053-1066 ◽  
Author(s):  
Soraya C. M. Leal-Bertioli ◽  
Ignácio J. Godoy ◽  
João F. Santos ◽  
Jeff J. Doyle ◽  
Patrícia M. Guimarães ◽  
...  
Keyword(s):  
Homoeologous Recombination

The pattern of homoeologous recombination in triploid hybrids of Lolium multiflorum with Festuca pratensis

Genome ◽  
1999 ◽  
Vol 42 (4) ◽  
pp. 720-726 ◽  
Author(s):  
Z Zwierzykowski ◽  
A J Lukaszewski ◽  
B Naganowska ◽  
A Lesniewska
Keyword(s):  
Parental Species ◽  
Lolium Multiflorum ◽  
Festuca Pratensis ◽  
Meiotic Pairing ◽  
Homoeologous Recombination ◽  
Translocation Breakpoints ◽  
Zygotic Selection ◽  
Homoeologous Chromosomes ◽  
Pairing Initiation

Homoeologous chromosomes of Lolium-Festuca hybrids are capable of frequent meiotic pairing and recombination. The frequency and distribution of recombination was studied by genomic in situ hybridization in backcross progenies of reciprocal triploid hybrids of Lolium multiflorum with Festuca pratensis. Significant differences in the male transmission of the parental and translocated chromosomes were observed depending on the cytoplasm of the F1 hybrids and the ploidy level of the female test cross partner. The frequency of intergeneric translocations in the progeny indicated that, on average, there must have been at least 4.5 homoeologous arms paired in the F1 hybrids; the actual frequency might have been higher because of pre- or post-zygotic selection against the F. pratensis chromatin, which probably eliminated certain gametes with Festuca-Lolium translocations. Both parental species are known for localized distal chiasmata, but the intergeneric translocation breakpoints were distributed along the entire lengths of the chromosome arms. The change in the distribution of homoeologous recombination might have been related to different pairing initiation of homologues and homoeologues. It probably resulted from allocation of additional chiasmata to chromosome arms and produced a net increase in recombination.Key words: homoeologous exchanges, Lolium-Festuca, translocations, recombination.

Molecular cytogenetic characterization of an alloplasmic durum wheat line with a portion of chromosome 1D of Triticum aestivum carrying the scsae gene

Genome ◽  
2004 ◽  
Vol 47 (1) ◽  
pp. 206-214 ◽  
Author(s):  
Khwaja G Hossain ◽  
Oscar Riera-Lizarazu ◽  
Venugopal Kalavacharla ◽  
M Isabel Vales ◽  
Jamie L Rust ◽  
...  
Keyword(s):  
Triticum Aestivum ◽  
In Situ Hybridization ◽  
Durum Wheat ◽  
Triticum Turgidum ◽  
Aegilops Tauschii ◽  
Distal Region ◽  
Specific Gene ◽  
Homoeologous Recombination ◽  
Male Sterile

Triticum aestivum (2n = 6x = 42, AABBDD) with Triticum longissimum (2n = 2x = 14; S1S1) cytoplasm ((lo) cytoplasm) has normal fertility and plant vigor. However, the nucleus of durum wheat (Triticum turgidum (2n = 4x = 28, AABB)) is incompatible with the T. longissimum cytoplasm, producing non-viable progeny. This incompatibility is alleviated by scsae, a species cytoplasm-specific (scs) gene, on the long arm of chromosome 1D (1DL) of common wheat. The hemizygous (lo) durum scsae line is male sterile and is maintained by crossing to normal durum wheat. After pollination, the seeds produced are either plump and viable (with scsae) or shriveled and inviable (without scsae). Thus, the chromosome with scsae is inherited as a whole without recombination. The objectives of this study were to characterize the chromosome carrying scsae and to determine the process through which this gene was introgressed into the (lo) durum background. Molecular marker analysis with 27 probes and primers mapped to homoeologous group 1 and genomic in situ hybridization using differentially labeled total genomic DNA of durum wheat and Aegilops tauschii suggest the presence of a 1AL segment in place of the distal region of 1DL. Owing to the absence of any detectable duplications or deletions, homoeologous recombination is the most likely mechanism by which this introgression occurred.Key words: homoeologous recombination, in situ hybridization, nuclear-cytoplasmic interaction, species cytoplasm specific gene

A novel reporter for intrachromosomal homoeologous recombination in Arabidopsis thaliana

2004 ◽  
Vol 40 (6) ◽  
pp. 1007-1015 ◽  
Author(s):  
Liangliang Li ◽  
Samuel Santerre-Ayotte ◽  
Eric Benoît Boivin ◽  
Martine Jean ◽  
François Belzile
Keyword(s):  
Arabidopsis Thaliana ◽  
Homoeologous Recombination

The extent and position of homoeologous recombination in a distant hybrid of Alstroemeria : a molecular cytogenetic assessment of first generation backcross progenies

Chromosoma ◽  
1999 ◽  
Vol 108 (1) ◽  
pp. 52-63 ◽  
Author(s):  
Anja G. J. Kuipers ◽  
Marjo J. De Jeu ◽  
M. S. Ramanna ◽  
Evert Jacobsen ◽  
Silvan A. Kamstra
Keyword(s):  
First Generation ◽  
Homoeologous Recombination ◽  
Molecular Cytogenetic ◽  
Distant Hybrid

Rye heterochromatin. II. Characterization of a derivative from chromosome 1DS.1RL with a reduced amount of the major repeating sequence

1986 ◽  
Vol 28 (5) ◽  
pp. 658-664 ◽  
Author(s):  
R. M. D. Koebner ◽  
R. Appels ◽  
K. W. Shepherd
Keyword(s):  
Sister Chromatid ◽  
Seed Protein ◽  
Homoeologous Recombination ◽  
Normal Amount ◽  
Recombinant Chromosome ◽  
Loss Event ◽  
Chromosome 1R ◽  
Terminal Heterochromatin ◽  
Heterochromatic Sequence

Homoeologous recombination between wheat chromosomes and the long arm of chromosome 1R of rye present in a wheat background as the wheat–rye translocation, 1DS.1RL, has been reported. During the course of this study an unexpected plant (308-17), with a recombinant phenotype, arose from a control population where homoeologous pairing was thought to be suppressed. The putative recombinant chromosome in plant 308-17 carried two seed protein loci located on 1RL (namely, the rye Glu-R1 locus and a recently discovered globulin-like marker) but appeared to lack C-banded heterochromatin. Further investigation of this apparent recombinant chromosome in progeny of 308-17 using a cloned probe for the 350 family of rye heterochromatic sequence indicated that some terminal heterochromatin was still present but in a much reduced amount. Because it appears that only the terminal region has been changed, the modified chromosome in 308-17 most likely did not arise from homoeologous recombination but rather from some form of heterochromatin loss event, possibly involving an unequal sister chromatid exchange within the terminal heterochromatin of 1RL. Sister lines to plant 308-17 carrying Glu-R1 contained a normal amount of 1RL heterochromatin.Key words: rye–wheat, heterochromatin, recombinant, unequal sister chromatid exhange.

scholarly journals Genome rearrangements derived from homoeologous recombination following allopolyploidy speciation in coffee

2014 ◽  
Vol 78 (4) ◽  
pp. 674-685 ◽  
Author(s):  
Philippe Lashermes ◽  
Marie-Christine Combes ◽  
Yann Hueber ◽  
Dany Severac ◽  
Alexis Dereeper
Keyword(s):  
Genome Rearrangements ◽  
Homoeologous Recombination
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