Abstract
Hybrids between polyploid Aegilops species sharing two common genomes were analysed at metaphase I by using a C-banding technique in order to establish genome relationships. In all cases it allowed discrimination between associations of chromosomes with similar morphology and C-banding belonging to the same genomes (homomorphic associations) and associations involving different chromosomes (heteromorphic associations). In the hybrids involving Ae. variabilis and Ae. kotschyi, (UUSS), it was also possible to identify the U and S genomes, which are shared by the tetraploid species, and their analysis indicated that the genomes of both species are essentially unaltered. However, the data of the Ae. crassa(6x) x Ae. vavilovii (DDDMMN) hybrid showed that the divergences between the shared genomes are at present substantial despite their common origin. By contrast, in the case of the Ae. triaristata(6x) x Ae. triaristata(4x) (UUMMN) hybrid the data did not confirm that the hexaploid species arose from the tetraploid one.
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Chapman, V, and Miller, T E. 1978. The relationship of the D genomes of hexaploid Ae. crassa, Ae. vavilovii and hexaploid wheat. Wheat Inf Serv, 47/48, 17–20.
Cuñado, N. 1992. Analysis of metaphase I chromosome association in species of the genus Aegilops. Theor Appl Genet, (in press).
Cuñado, N. 1993. Genomic analysis in the genus Aegilops. I. Interspecific hybrids between tetraploid species sharing a common genome. Heredity, 70, 9–15.
Dvorak, J, and Appels, R. 1982. Chromosome and nucleotide sequence differentiation in genomes of polyploid Triticum species. Theor Appl Genet, 63, 349–360.
Dvorak, J, and Macguire, P E. 1981. Nonstructural chromosome differentiation among wheat cultivars, with special reference to differentiation of chromosomes in related species. Genetics, 97, 391–414.
Espinasse, A, and Kimber, G. 1981. The analysis of meiosis in hybrids.IV. Pentaploid hybrids. Can J Genet Cytol, 23, 627–638.
Ferrer, E, Gonzalez, J M, and Jouve, N. 1984. The meiotic pairing of nine wheat chromosomes. Theor Appl Genet, 69, 193–198.
Furuta, Y. 1981. Intraspecific variation in Aegilops variabilis and Ae. kotschyi revealed by chromosome pairing in F1 hybrids. Jpn J Genet, 56, 495–504.
Kawahara, T. 1986. Difference in structural variability of genomes in Triticum and Aegilops. Wheat Inf Serv, 63, 42–43.
Kihara, H. 1963. Interspecific relationship in Triticum and Aegilops. Seiken Zihô, 15, 1–12.
Kimber, G, and Feldman, M. 1987. Wild Wheats: an Introduction. College of Agriculture, University of Missouri, Columbia MO., Special Report No. 353, pp. 114–128.
Kimber, G, and Tsunewaki, K. 1988. Genome symbols and plasma types in the wheat group. Proc 7th Int Wheat Genet Symp, 2, 1209–1210.
Kimber, G, and Yen, Y. 1989. Hybrids involving wheat relatives and autotetraploid Triticum umbellulatum. Genome, 32, 1–5.
Kimber, G, and Zhao, Y H. 1983. The D genome of the Triticeae. Can J Genet Cytol, 25, 581–589.
Lucas, H, and Jahier, J. 1988. Phylogenetic relationships in some diploid species of Triticineae: cytogenetic analysis of interspecific hybrids. Theor Appl Genet, 75, 498–502.
Nakai, Y. 1982. D genome donors for Aegilops crassa (DDMcrMcr, DDDDMcrMcr) and Ae. vavilovii (DDMcr-McrSpSp) deduced from esterase analysis by isoelectric focusing. Jap J Genet, 57, 349–360.
Nakai, Y, and Tsuji, S. 1984. A polyacrilamide gel isoelectro-focusing study of acid phosphatase isozymes of Aegilops species with reference to their numerical taxonomy. Seiken Zihô, 32, 1–8.
Riley, R, and Law, C N. 1965. Genetic variation in chromosome pairing. Adv Genet, 13, 57–114.
Vega, C, Fominaya, A, and Ferrer, E. 1987. Influence of chromosome structure on the degree of meiotic pairing of intercultivar wheat hybrids (Triticum aestivum L.). Heredity, 58, 357–363.
Waranabe, Y. 1962. Meiotic irregularities in intervarietal hybrids of common wheat. Wheat Inf Serv, 14, 5–7.
Zhao, Y H, and Kimber, G. 1984. New hybrids with D genome wheat relatives. Genetics, 106, 509–515.
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The author thanks Professor J. R. Lacadena for his help in the preparation of this manuscript.
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Cuñado, N. Genomic analysis in the genus Aegilops. II. Interspecific hybrids between polyploid species sharing two common genomes. Heredity 70, 16–21 (1993). https://doi.org/10.1038/hdy.1993.3
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DOI: https://doi.org/10.1038/hdy.1993.3
