Abstract
Triticum timopheevii ssp.timopheevii andT. timopheevii ssp.araraticum were analysed by sequential N-banding and genomicin situ hybridization. Three chromosomes, 6At, 1G and 4G, were involved in At-G intergenomic translocations in all six lines analysed. These chromosomes may be derived from a cyclic translocation that is species-specific toT. timopheevii. In contrast,Triticum turgidum has a species-specific cyclic translocation involving chromosomes 4A, 5A and 7B. The discovery of different species-specific chromosome translocations supports the diphyletic hypothesis of the evolution of tetraploid wheats. The results from genomic blocking analysis also revealed that the chromosomes ofAegilops speltoides are closer to the G genome than the B genome chromosomes. The possible role of speciesspecific translocations in the evolution of wheat is discussed.
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Jiang, J., Gill, B.S. Different species-specific chromosome translocations inTriticum timopheevii andT. turgidum support the diphyletic origin of polyploid wheats. Chromosome Res 2, 59–64 (1994). https://doi.org/10.1007/BF01539455
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DOI: https://doi.org/10.1007/BF01539455