A homoeologous-pairing mutant isolated in Triticum durum cv. Cappelli

Giorgi, B.

Mutation Breeding Newsletter 11: 4-5


Accession: 000271424

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A mutant line characterized by mutation for awn colour was isolated following irradiation of Cappelli. In cytological studies of the mutant in 1965, a simple translocation was observed; the long arm of the chromosome pair which has since been identified as chromosome 5B was longer than normal in some plants and shorter in others. In metaphase I in microsporocytes, normal pairing was observed in the former type of plant, but two to four univalents and rarely a multivalent were present in the latter type. Homeologous pairing of up to four univalents, four bivalents and three trivalents per cell has now been observed in microsporocytes of F1 plants of the cross between the mutant and Aegilops longissima. It seemed that an unequal translocation between the long arms of chromosomes 5B had occurred, giving rise to individuals without the Ph locus. It is suggested that transference of genes to durum wheat from its wild related species may be possible using this mutant.