Chromosome healing by addition of telomeric repeats in wheat occurs during the first mitotic divisions of the sporophyte and is a gradual process

Chromosome Research : an International Journal on the Molecular, Supramolecular and Evolutionary Aspects of Chromosome Biology
B FriebeB S Gill

Abstract

Alien gametocidal chromosomes cause extensive chromosome breakage prior to S-phase in the first mitotic division of gametophytes lacking the alien chromosome. The broken chromosomes may be healed either by addition of telomeric repeats in the gametophyte or undergo fusions to form dicentric or translocation chromosomes. We show that dicentric chromosomes undergo breakage fusion-bridge (BFB) cycles in the first few mitotic divisions of the sporophyte, are partially healed before the germ line differentiation regimen, and are healed completely in the ensuing gametophytic stage. The gametocidal factor on chromosome 4Mg of Aegilops geniculata was used to induce dicentrics involving the satellite chromosomes1B and 6B of wheat, Triticum aestivum. The dicentrics 1BS x 1BL-2AL x 2AS and 6BS x 6BL-4BL x 4BS initiated BFB cycles that ceased 2 to 4 weeks after seed germination. At the end of the BFB cycles, we observed deficient 1B and 6B chromosomes with breakpoints in proximal regions of the 1BL and 6BL arms. The process of chromosome healing was analyzed in root tip meristems, at meiotic metaphase I, and in the derived progenies by fluorescence in-situ hybridization analysis using a telomeric probe pAtT4. The results show that chromoso...Continue Reading

Citations

Feb 19, 2002·Oncogene·Anne-Lyse DucrestMarkus Nabholz
Aug 5, 2017·The Plant Journal : for Cell and Molecular Biology·Tatiana V DanilovaBikram S Gill
Apr 1, 2004·Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution·Reinhard Stindl
Aug 12, 2005·Genome Génome / Conseil National De Recherches Canada·Lili QiBikram S Gill
Oct 4, 2011·Genome Génome / Conseil National De Recherches Canada·Cheng LiuBikram S Gill
May 14, 2016·Molecular Biology Reports·Laiane Corsini RochaVânia Helena Techio
May 21, 2016·Genome Génome / Conseil National De Recherches Canada·Janay A Santos-Serejo, Margarida L R Aguiar-Perecin
Feb 26, 2014·Genome Génome / Conseil National De Recherches Canada·Shu-Lan FuZong-Xiang Tang
Jan 30, 2013·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Wenxuan LiuMichael O Pumphrey
Oct 2, 2014·Journal of Experimental Botany·Almudena CastilloAzahara C Martín
Oct 30, 2004·Genetics· MiftahudinJ P Gustafson
Nov 7, 2006·Proceedings of the National Academy of Sciences of the United States of America·Weichang YuJames A Birchler

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