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

被引:4
作者
Silkova, O. G. [1 ]
Ivanova, Y. N. [1 ]
Krivosheina, E. A. [1 ]
Bondarevich, E. B. [2 ]
Solovey, L. A. [2 ]
Sycheva, E. A. [2 ]
Dubovets, N. I. [2 ]
机构
[1] Russian Acad Sci, Inst Cytol & Genet, Siberian Branch, Novosibirsk 630090, Russia
[2] Natl Acad Sci Belarus, Inst Genet & Cytol, Minsk 220072, BELARUS
基金
俄罗斯科学基金会;
关键词
FISH; GISH; chromosome alterations; karyotype structure; Secale cereale; Triticum aestivum; RYE SUBSTITUTION LINES; PREFERENTIAL ELIMINATION; CENTRIC MISDIVISION; HEXAPLOID TRITICALE; PARENTAL FORMS; KARYOTYPE; IDENTIFICATION; ORGANIZATION; CENTROMERES; UNIVALENTS;
D O I
10.1007/s10535-017-0757-0
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
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, the 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 C-banding, genomic in situ hybridisation (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 1A replaced by Secale cereale 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 1A, 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 AI, the two wheat homologues separated onto sister chromatids in 10.89 % of cells.The plants F2 karyotypes were marked with aneuploidy not only of chromosomes 1A and 1Rv, but also of 1D, 2D, 3D, 3B, 3A, 4A, 6D, 6B, 6A, and 7D. Structural changes were observed for the chromosomes of the first homoeologous group (1Rv, 1A, 1D, 1B), as well as for 2B, 5D, 6B, and 7B. The chromosomes 1Rv and 6B often demonstrated aberrations. The types of aberrations were centromeric break, deletions of various sizes, and a changed repeat pSc119.2 localization pattern.
引用
收藏
页码:241 / 249
页数:9
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