Abstract
Genome instability is observed in several species hybrids. We studied the mechanisms underlying the genome instability in hexaploid hybrids of Napier grass (Pennisetum purpureum R.) and pearl millet (Pennisetum glaucum L.) using a combination of different methods. Chromosomes of both parental genomes are lost by micronucleation. Our analysis suggests that genome instability occurs preferentially in meristematic root tissue of hexaploid hybrids, and chromosome elimination is not only caused by centromere inactivation. Likely, beside centromere dysfunction, unrepaired DNA double-strand breaks result in fragmented chromosomes in synthetic hybrids.
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Abbreviations
- DAPI:
-
4′,6-Diamidino-2-phenylindole
- GISH:
-
Genomic in situ hybridization
- FISH:
-
Fluorescence in situ hybridization
- CENH3:
-
Centromere-specific histone H3
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Acknowledgments
The authors would like to thank the FAPEMIG (Fundação de Amparo a Pesquisa do Estado de Minas Gerais), CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior), CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnológico), and IPK (Gatersleben) for providing the financial support; EMBRAPA (Brazilian Corporation of Agricultural Research) for the plant material; and Marcel José Palmieri for the statistical analysis.
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Figure Suppl. 1
Flow cytometry histograms of analyzed Napier grass, pearl millet and hexaploid hybrids (6X-1, 6X-2, 6X-3, 6X-4 and 6X-5). (DOC 497 kb)
Figure Suppl. 2
Fluorescence in situ hybridization with centromere-specific probes. (A) Napier grass (NG). (B) Pearl millet (PM). Bars = 10 μm. (DOC 304 kb)
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dos Reis, G.B., Ishii, T., Fuchs, J. et al. Tissue-specific genome instability in synthetic interspecific hybrids of Pennisetum purpureum (Napier grass) and Pennisetum glaucum (pearl millet) is caused by micronucleation. Chromosome Res 24, 285–297 (2016). https://doi.org/10.1007/s10577-016-9521-0
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DOI: https://doi.org/10.1007/s10577-016-9521-0