Abstract
Supernumerary (B) chromosomes of rye are not required for plant development and exhibit a reduced transcription activity. These special features inspired us to analyse whether there are differences between A and B chromatin organization in interphase nuclei. Applying fluorescence in situ hybridization, we found that both rye A and B chromosomes added to hexaploid wheat showed in meristematic nuclei a string-like shape and a clear Rabl orientation. In 4C differentiated leaf nuclei, a more relaxed chromatin structure, round-shaped chromosome territories and a less pronounced Rabl configuration were found. Also, the observed random association of homologues in 2C and 4C nuclei indicated in general a similar behaviour of A and B chromosomes. Whereas in differentiated 4C nuclei A sister centromeres are separated, B sister centromeres align in nearly all nuclei. In short, despite the different transcription activity of A and B chromosomes, both types of chromosomes exhibit a similar organization in meristematic and differentiated interphase nuclei. But the deletion of a B chromosome segment responsible for non-disjunction during gametogenesis induces released sister centromeres also in some interphase nuclei of somatic tissue. Hence, the control of rye B chromosome non-disjunction is also active in sporophytic cells.
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Abbreviations
- CT:
-
Chromosome territory
- Cen:
-
Centromere
- FISH:
-
Fluorescence in situ hybridization
- NOR:
-
Nucleolar organizing region
- RSD:
-
Random spatial distribution
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Acknowledgements
We thank Steve Reader for providing seeds, Katrin Kumke for excellent technical assistance, Jörg Fuchs for sorting of nuclei and Ingo Schubert for critical reading of the manuscript. This work was supported by the Deutsche Forschungsgemeinschaft (HO 1779/10-1).
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Supplementary Table 1
Dimensions and areas of nuclei (blue), chromosome territories (CTs, red) and centromere (Cen, green) signals (mean values per addition line and ploidy level) used for the RSD computer model simulations (DOC 61 kb)
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Schubert, V., Meister, A., Tsujimoto, H. et al. Similar rye A and B chromosome organization in meristematic and differentiated interphase nuclei. Chromosome Res 19, 645–655 (2011). https://doi.org/10.1007/s10577-011-9224-5
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DOI: https://doi.org/10.1007/s10577-011-9224-5