Abstract
To evaluate the mitotic stability of Triticum aestivum×Thinopyrum ponticum derivatives (BC2F7 and BC2F5 doubled haploids), chromosome counting by both conventional and immunostaining techniques, and measurement of DNA content were performed. The wheat progenitor line, PF 839197, the wheat recurrent parent CEP 19 and the control Chinese Spring were also investigated. In the hybrid derivatives, chromosome number ranged from 2n=36 to 60, with a predominance of chromosome numbers higher than 2n=42, that was confirmed by determination of nuclear DNA content. Chinese Spring’ and PF 839197 were stable, but CEP 19 showed chromosome number variation (20%). Analyses of non-pretreated cells revealed the presence of anaphase bridges, lagging chromatids, chromosome fragments and micronuclei. Immunostaining with an antibody recognizing histone H3 phosphorylated showed dicentric chromatids forming anaphase bridges and pericentromeric phosphorylation at centric chromosome fragments but not at lagging chromatids. The possible causes of the observed mitotic instability are discussed.
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This work was supported by grants and fellowships from the Conselho Nacional de Desenvolvimento Científico e Tecnológico and the Fundação de Amparo a Ciência e Tecnologia do Estado de Pernambuco. The authors are very grateful to Dilma Angra for helpful suggestions and M. J. Puertas acknowledges financial support for travel from the Complutense University of Madrid.
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Brasileiro-Vidal, A.C., Brammer, S., Puertas, M.J. et al. Mitotic instability in wheat×Thinopyrum ponticum derivatives revealed by chromosome counting, nuclear DNA content and histone H3 phosphorylation pattern. Plant Cell Rep 24, 172–178 (2005). https://doi.org/10.1007/s00299-005-0913-4
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DOI: https://doi.org/10.1007/s00299-005-0913-4