Microevolutionary differentiation of cereal tetraploid species by formation of recombinant genomes

Dubovets, N. I.; Sycheva, Ye. A.

doi:10.18699/vj16.136

Cited by 2 publications

(3 citation statements)

References 26 publications

(27 reference statements)

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“…Selection for fertility may also have selected against plants with homoeologous recombination events involving the B genome. Previously, self-pollination of a wheat (Triticum aestivum)-rye (Secale cereale) hybrid with 2n = RRAB up until the F 17 generation revealed less frequent recombination between the A and B genomes and complete retention of the R genome in the early generations, but no restoration of genome stability (Dubovets & Sycheva, 2017). This is in contrast to our results of early fixation of karyotypes and restoration of genome stability by the S 5/6 generations.…”

Section: Discussioncontrasting

confidence: 99%

“…In polyploid taxa, primary polyploids may also hybridize, leading to the formation of secondary polyploid hybrids (Rieseberg, 1997;Soltis & Soltis, 2009;Abbott et al, 2013). In the Aegilops genera, it was found that allotetraploids that share one common genome hybridize easily (Zohary & Feldman, 1962;Dubovets & Sycheva, 2017). In hybridization between allotetraploids that share a common genome, it has been suggested that this common genome serves as a buffer, providing the opportunity for recombination between the differential genomes and leading to the formation of many new variants of the recombinant genome (Zohary & Feldman, 1962;Kimber & Yen, 1988;Badaeva et al, 2002;Dubovets & Sycheva, 2017) (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Stable, fertile lines produced by hybridization between allotetraploids Brassica juncea (AABB) and Brassica carinata (BBCC) have merged the A and C genomes

et al. 2021

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Many flowering plant taxa contain allopolyploids that share one or more genomes in common. In the Brassica genus, crop species Brassica juncea and Brassica carinata share the B genome, with 2n = AABB and 2n = BBCC genome complements, respectively. Hybridization results in 2n = BBAC hybrids, but the fate of these hybrids over generations of self-pollination has never been reported. We produced and characterized B. juncea 9 B. carinata (2n = BBAC) interspecific hybrids over six generations of self-pollination under selection for high fertility using a combination of genotyping, fertility phenotyping, and cytogenetics techniques. Meiotic pairing behaviour improved from 68% bivalents in the F 1 to 98% in the S 5 /S 6 generations, and initially low hybrid fertility also increased to parent species levels. The S 5 /S 6 hybrids contained an intact B genome (16 chromosomes) plus a new, stable A/C genome (18-20 chromosomes) resulting from recombination and restructuring of A and C-genome chromosomes. Our results provide the first experimental evidence that two genomes can come together to form a new, restructured genome in hybridization events between two allotetraploid species that share a common genome. This mechanism should be considered in interpreting phylogenies in taxa with multiple allopolyploid species.

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Section: Discussioncontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stable, fertile lines produced by hybridization between allotetraploids Brassica juncea (AABB) and Brassica carinata (BBCC) have merged the A and C genomes

et al. 2021

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“…The loss of DNA sequences alters the structures of rye and wheat chromosomes in the triticale chromosome set. This reorganization is also characterized by chromosome set instability, that is, the elimination of chromosomes or whole subgenomes [51][52][53][54][55][56][57][58][59].…”

Section: Introductionmentioning

confidence: 99%

Karyotype Reorganization in Wheat–Rye Hybrids Obtained via Unreduced Gametes: Is There a Limit to the Chromosome Number in Triticale?

Silkova

Ivanova

Loginova

et al. 2021

Plants

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To date, few data have been accumulated on the contribution of meiotic restitution to the formation of Triticum aestivum hybrid karyotypes. In this study, based on FISH and C-banding, karyotype reorganization was observed in three groups of F5 wheat–rye hybrids 1R(1A) × R. Aberrations, including aneuploidy, telocentrics, and Robertsonian translocations, were detected in all groups. Some of the Group 1 plants and all of the Group 2 plants only had a 4R4R pair (in addition to 1R1R), which was either added or substituted for its homeolog in ABD subgenomes. In about 82% of meiocytes, 4R4R formed bivalents, which indicates its competitiveness. The rest of the Group 1 plants had 2R and 7R chromosomes in addition to 1R1R. Group 3 retained all their rye chromosomes, with a small aneuploidy on the wheat chromosomes. A feature of the meiosis in the Group 3 plants was asynchronous cell division and omission of the second division. Diploid gametes did not form because of the significant disturbances during gametogenesis. As a result, the frequency of occurrence of the formed dyads was negatively correlated (r = −0.73) with the seed sets. Thus, meiotic restitution in the 8n triticale does not contribute to fertility or increased ploidy in subsequent generations.

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Microevolutionary differentiation of cereal tetraploid species by formation of recombinant genomes

Cited by 2 publications

References 26 publications

Stable, fertile lines produced by hybridization between allotetraploids Brassica juncea (AABB) and Brassica carinata (BBCC) have merged the A and C genomes

Stable, fertile lines produced by hybridization between allotetraploids Brassica juncea (AABB) and Brassica carinata (BBCC) have merged the A and C genomes

Karyotype Reorganization in Wheat–Rye Hybrids Obtained via Unreduced Gametes: Is There a Limit to the Chromosome Number in Triticale?

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