Abstract
Alloplasmic lines of common wheat with disomic substitution of chromosome 7D for telocentric chromosome 7H1Lmar of barley H. marinum subsp. gussoneanum Hudson were isolated from the plants of generation BC3, produced as a result of backcrossing of barley-wheat hybrids H. marinum subsp. gussoneanum (2n = 28) × T. aestivum (2n = 42), Pyrotrix, cultivar, with 28 common wheat cultivars Pyrotrix 28 and Novosibirskaya 67. Chromosome substitution pattern was determined using SSR analysis and C-banding. In preliminary genomic in situ hybridization experiments, telocentric chromosomes were assigned to wild barley was established. In the BC3F8 generations of three alloplasmic lines with the 7H1Lmar(7D) substitution type the differences in fertility manifestation were observed: most of the L-32(1) plants were sterile, in line L-32(2) only sporadic plants were sterile, and line L-32(3) was fertile. Simultaneously with these experiments, using selfpollinated progeny of the hybrids obtained in crosses of common wheat cultivar Saratovskaya 29 (2n = 41), monosomic for chromosome 7D, with common wheat cultivar Pyrotrix 28 with addition of pair of telocentric chromosomes 7H1Lmar (7D) of barley H. marinum subsp. gussoneanum, euplasmic wheat-barley ditelosomic substitution 7H1Lmar (7D) lines were isolated. The lines obtained had normal fertility. PCR analysis of the 18S/5S mitochondrial repeat (hereafter, mtDNA sequence) in alloplasmic and euplasmic ditelosomic substitution lines 7H1Lmar(7D) was performed. In the plants from alloplasmic sterile line L-32(1), the sequences only of the barley (maternal) type were revealed, while the plants from alloplasmic fertile lines L-32(2) and L-32(3) demonstrated heteroplasmy (the presence of barley- and wheat-like sequences within one individual). In euplasmic ditelosomic substitution lines the presence of only wheat-like 18S/5S mitochondrial repeat sequences was observed. The results indicate that the presence of barley-like mtDNA sequences in alloplasmic substitution lines was not associated with the presence of barley chromosomes in their nuclear genomes.
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Original Russian Text © N.V. Trubacheeva, T.T. Efremova, E.D. Badaeva, L.A. Kravtsova, L.I. Belova, E.P. Devyatkina, L.A. Pershina, 2009, published in Genetika, 2009, Vol. 45, No. 12, pp. 1627–1633.
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Trubacheeva, N.V., Efremova, T.T., Badaeva, E.D. et al. Production of alloplasmic and euplasmic wheat-barley ditelosomic substitution lines 7H1Lmar(7D) and analysis of the 18S/5S mitochondrial repeat in these lines. Russ J Genet 45, 1438–1443 (2009). https://doi.org/10.1134/S1022795409120059
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DOI: https://doi.org/10.1134/S1022795409120059