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Journal of Applied Genetics 44(2), 2003, pp. 129-137

The influence of rye cytoplasm on meiotic stability of tetraploid Secalotriticum


Abstract: Chromosome pairing in tetraploid Secalotriticum was analysed. In the studied plants wheat chromosomes in PMCs during metaphase I showed a higher degree of pairing, in comparison to the rye genome. This is reflected in a very low frequency of univalents and a higher frequency of ring bivalents. The occurrence of wheat univalents was dependent on wheat mixogenome. In plants with an unstabilized fourth homoeologous group, a heteromorphic bivalent 4A-4B was observed in 39.9% of PMCs, whereas in plants with an unstabilized seventh homoeologous group, chromosome 7A-7B pairing was found in all analysed

Key words: homoeologous pairing, rye genome, tetraploidSecalotriticum, wheat genomes.

Correspondence: B. APOLINARSKA, Institute of Plant Genetics, Polish Academy of Sciences, ul. Strzeszynska 34, 60-479 Poznan, Poland, e-mail:

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