The meiotic chromosomal pairing of tetraploid durum and timopheevii wheat was studied under different temperatures of vegetation. The temperature influence on the recombination process is determined by a genotype and depends on plant resistance to the considered factor. It was stated that durum wheat varieties have a denser synapsis as compared to T. timopheevii variety. The chromosomal pairing results of the timopheevii samples under temperature changes are more variable. This fact shows that T. timopheevii is a more adaptive species.

Key words: durum wheat, timopheevii wheat, genotypical diversity, variation, temperature factor, chromosomal pairing, recombination process, chiasma frequency, bivalents, univalents, adaptation.