Sechnjak A.L., Prokopovich E.L., Fait V.I.

Cytogenetic processes in the course of Triticum aestivum and Haynatricum hybridization

Cytology and Genetics 2003, v 37, number 5, 72–79

Meiosis in hybrids obtained in direct and return crossings between Hаynatricum and wheat was studied. In F₁ hybrids the possibility of stimulation of homoeologous pairing between the chromosomes of T. aestivum and T. dicoccum and, probably, H. villosum, if Haynatricum was used as pollinator, has been shown. This process is considerably intensified when the genes regulating chromosome pairing, in particular ph1b mutation, are used.  In reciprocal crosses it was shown that wheat genotypes can differently influence on homoeologous chromosome pairing. In BC₁ and F₂ generations the chromosome compositions are determining which arise as a result of stochastic processes in premeiotic mitoses and in meiosis in F₁ hybrids.