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Chromosome pairing in allo hexa ploid wheat triticum aestivum cultivar chinese spring transformation of multivalents into bivalents a mechanism for exclusive bivalent formation



Chromosome pairing in allo hexa ploid wheat triticum aestivum cultivar chinese spring transformation of multivalents into bivalents a mechanism for exclusive bivalent formation



Carlsberg Research Communications 46(3): 129-174



Meiosis in allohexaploid wheat, T. aestivum 'Chinese Spring' was investigated by complete 3 dimensional reconstructions of a late zygotene and an early pachytene nucleus. At zygotene, specific synapsis of homologous chromosomes and chromosome segments gives rise to extensive multivalent formation with shifts of pairing partners between apparently homologous chromosomes. These observations were confirmed by the identification of shifts of pairing partners in 3 serial sectioned, but only partly reconstructed zygotene nuclei. In striking contrast, the pairing at early pachytene was exclusively in bivalents. These findings exclude a presynaptic alignment as the primary cause for regular bivalent formation. Instead, multivalents form during the specific zygotene pairing but are later transformed into bivalents through dissolution and reassembly of synaptonemal complexes. The regular bivalent formation in allohexaploid wheat is probably due to a temporal delay of crossing over until the pairing correction is completed at early pachytene. This temporal delay may be mediated by the action of the Ph gene(s) on chromosome 5B. Interlockings were revealed in the completely reconstructed late zygotene nucleus but were resolved prior to early pachytene.

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