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Parental genomes are separated throughout the cell cycle in a plant hybrid

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Abstract

The positions of the genomes originating from each parent were analysed in root-tip nuclei of the mature, sexual F1 hybrid plant Hordeum vulgare (barley) x Secale africanum (a wild rye). The two genomes of the hybrid were identified in both spread and sectioned material by non-radioactive DNA:DNA in situ hybridization using labelled total genomic DNA from one parent as a proble and unlabelled total genomic DNA from the other parent to block non-specific hybridization. Complete three-dimensional reconstructions of sets of labelled sections enabled detailed analysis of the position of the genomes at interphase. The parental genomes lay in various non-intermixed configurations, including lateral and concentric arrangements. On spread preparations, the two parental genomes were found to be spatially separated throughout the cell cycle; the genome originating from H. vulgare tended to be located more centrally than that from S. africanum. This results show that the nucleus is spatially organized above the level of the DNA and chromosome at the genome level.

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by M.F. Trendelenburg

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Leitch, A.R., Schwarzacher, T., Mosgöller, W. et al. Parental genomes are separated throughout the cell cycle in a plant hybrid. Chromosoma 101, 206–213 (1991). https://doi.org/10.1007/BF00365152

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  • DOI: https://doi.org/10.1007/BF00365152

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