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Partial asynapsis involving specific chromosomes in intervarietal hybrids of Triticum aestivum L.

  • Cytology and Genetics
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Summary

Metaphase I chromosome association of the monosomic F1 and the backcross progenies made to develop a monosomic line in the Spanish common wheat Pané-247 was analyzed using a Giemsa C-banding technique. This permits the unequivocal identification of nine meiotic chromosomes (4A, 7A and the seven chromosomes of the B genome). The average frequencies of pairing per arm and of univalents for these nine pairs per arm and of univalents for these nine pairs indicate a difference between arms. The F1 showed asynapsis with univalents in 18.5 per cent of PMC's in intervarietal hybrids. This mainly involved chromosomes 4A, 1B and 6B which also have the largest amount of constitutive heterochromatin. The possible causes of reduced metaphase I association and its rapid decrease during backcrossing are discussed in relation to polymorphism between heterozygous homologous chromosomes.

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Authors and Affiliations

  1. Departamento de Genética, Facultad de Ciencias, Universidad de Alcalá de Henares, Apdo, 20, Alcalá de Henares, (Madrid), Spain

    E. Ferrer, C. Galindo, J. M. Gonzalez & N. Jouve

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  1. E. Ferrer
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  2. C. Galindo
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  3. J. M. Gonzalez
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  4. N. Jouve
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Ferrer, E., Galindo, C., Gonzalez, J.M. et al. Partial asynapsis involving specific chromosomes in intervarietal hybrids of Triticum aestivum L.. Euphytica 35, 529–537 (1986). https://doi.org/10.1007/BF00021862

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  • DOI: https://doi.org/10.1007/BF00021862

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