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Synaptic behaviour of the tetraploid wheat Triticum timopheevii

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Abstract

Triticum timopheevii (2n=4x=AtAtGG) is an allotetraploid wheat which shows a diploid-like behaviour at metaphase-I. The synaptic process was analyzed in fully traced spread nuclei at mid-zygotene, late-zygotene and pachytene. The length and type of synaptonemal complexes, as well as the number of bivalent and multivalent associations, were determined in each nucleus. A high number of bivalents per nucleus was detected at all three stages. Nuclei at pachytene showed a lower frequency of multivalents than did zygotene nuclei, which suggests the existence of a pairing correction mechanism. At metaphase-I only homologous bivalents and, rarely, one pair of univalents were observed. Similarities between the diploidization mechanism of T. timopheevii and that of allohexaploid wheat, controlled by chromosome 5B, are discussed.

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Communicated by B. S. Gill

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Martinez, M., Naranjo, T., Cuadrado, C. et al. Synaptic behaviour of the tetraploid wheat Triticum timopheevii . Theoret. Appl. Genetics 93, 1139–1144 (1996). https://doi.org/10.1007/BF00230137

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Key words

  • Triticum timopheevii
  • Synaptonemal complex
  • Spreading
  • Diploidization mechanism