Recombinant genome of cereals: The pattern of formation and the role in evolution of polyploid species

Dubovets, N. I.; Sycheva, Elena A.; Соловей, Л. А.; Styk, T I; Бондаревич, Е. Б.

doi:10.1134/s1022795408010067

Cited by 4 publications

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“…Selection aiming to preserve the desired traits also affects the chromosomal composition of octoploid triticales (Cheng and Murata 2002). The genome composition of recent triticales is characterized by D(A), D(B), and D(R) substitutions or translocations that are relevant for the improvement of agronomic characteristics (Leonova et al 2005, Dubovets et al 2008, Zhou et al 2012. Translocations occur between wheat and rye chromosomes and between rye chromosomes.…”

Section: Introductionmentioning

confidence: 99%

Wheat chromosome instability in the selfed progeny of the double monosomics 1Rv-1A

et al. 2018

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Structural alterations of chromosomes are often found in wheat-rye hybrids. In the majority of cases modifications are observed for rye chromosomes, yet chromosome aberration cases are described for wheat, including the progeny of Triticum aestivum disomic and monosomic addition lines. Since wheat-rye substitution and translocation lines are the source of rye chromatin in wheat breeding programs, information on possible chromosome changes in the genomes of introgressive forms is important. Chromosome behavior in F 1 meiosis and chromosomal composition of F 2 karyotypes for double monosomics 1Rv-1A were studied by applying С-banding, genomic in situ hybridization (GISH) using rye genomic DNA, and sequential in situ hybridization using repetitive sequences pAs1, pSc119.2 and centromere specific pAet-06 as probes. The double monosomics 1Rv-1A were obtained by crossing of disomic substitution line with chromosome 1А replaced by Secale сereale 1Rv in the bread wheat Saratovskaya 29 (S29) background with S29. The results indicated a high frequency of bipolar chromosome 1Rv orientation, as compared to 1А, at metaphase I (MI) (58.6 and 34.7 % of meiocytes, respectively), and, at anaphase I (AI), chromatid segregation of 1Rv compared to 1A (70.53 and 32.14 % of meiocytes, respectively). In few cases desynapsis of wheat homologues was observed, at AI, the chromosomes randomly distributed between the poles or underwent chromatid segregation. At АI, the two wheat homologues separated onto sister chromatids in 10.89 % of cells. The plant F 2 karyotypes were marked with aneuploidy not only of chromosomes 1A and 1Rv, but also of 1D,

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