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Mitotic behavior of centromeres in meiosis as the fertility restoration mechanism in wheat-rye amphihaploids

  • Plant Genetics
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Abstract

The regulation of chromosomal behavior in meiosis in partly fertile wheat-rye amphihaploids was studied using the centromere specific probes pAWRC1 and Ae. tauschii pAet6-09. Comparative analysis of the probe localization patterns in mitosis, normal meiosis in wheat Triticum aestivum L. and rye Secale cereale L., and meiosis in amphihaploids was performed. The differences in the structure of centromeres in monopolar- and bipolaroriented chromosomes were revealed. Single dense hybridization signals were observed in the diplotene and the metaphase of the first meiotic division, while hybridization signals appeared as stretched bands with diffuse structure located across the centromere region in mitosis and the second round of meiotic division. Based upon the obtained data, we used the corresponding centromere-specific probes as a tool for the analysis of chromosomal behavior in meiosis in amphihaploids. In meiocytes with three types of chromosome behavior (reductional, equational plus reductional, and equational), dense point-like hybridization signals for the pAet6-09 probe were observed for univalents with the reductional division type and stretched bands with diffuse structure for those with the equational division type. Thus, pAet6-09 probe localization patterns suggest some structural and functional specificities of centromeres in the meiosis in wheat-rye amphihaploids that reflect special regulation of chromosomal behavior during equational division. Meiocytes with true mitotic division were also observed in anthers predominantly containing meiocytes with chromosomes undergoing equational division.

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Authors and Affiliations

  1. Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, Novosibirsk, 630090, Russia

    D. B. Loginova & O. G. Silkova

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  1. D. B. Loginova
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  2. O. G. Silkova
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Correspondence to O. G. Silkova.

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Original Russian Text © D.B. Loginova, O.G. Silkova, 2014, published in Genetika, 2014, Vol. 50, No. 8, pp. 930–939.

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Loginova, D.B., Silkova, O.G. Mitotic behavior of centromeres in meiosis as the fertility restoration mechanism in wheat-rye amphihaploids. Russ J Genet 50, 818–827 (2014). https://doi.org/10.1134/S1022795414070114

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  • DOI: https://doi.org/10.1134/S1022795414070114

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