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Nucleolar behaviour in Triticum

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Abstract

The maximum number of major nucleoli (macronucleoli) per nucleus of hexaploid, tetraploid and diploid wheat, Aegilops speltoides and Ae. squarrosa corresponded to the number of satellited chromosomes of each species. Smaller nucleoli (micronucleoli) were rare or absent in all of these species except the hexaploid, in which they were predominantly organized on chromosome arm 5Ds. — Fewer than the maximum number of macronucleoli in a mitotic interphase nucleus resulted from fusion of developing nucleoli. Enforced proximity of nucleolus-organizing regions resulted in more frequent fusion of nucleoli. — Analyses of related interphase nuclei showed that nucleoli, and hence probably chromosomes, undergo limited movement during mitotic interphase. These observations also indicate that specific chromosomes do not occupy specific sites in the interphase nucleus.

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Authors and Affiliations

  1. School of Botany, University of New South Wales, Australia

    N. L. Darvey & C. J. Driscoll

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  1. N. L. Darvey
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  2. C. J. Driscoll
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Darvey, N.L., Driscoll, C.J. Nucleolar behaviour in Triticum . Chromosoma 36, 131–139 (1972). https://doi.org/10.1007/BF00285208

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  • DOI: https://doi.org/10.1007/BF00285208

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