DATA ON HYBRID NECROSIS GENES IN THE GENU S TRITICUM L

The specific distribution of hybrid necrosis genes and necrotic genoty pes among tetraploid and hexaploid species of T. aestivum L. and among local and breeding varieties of T. aestivum and T. durum were analyze d. It was shown that tetraploid species carry the Ne1 gene, while hexa ploid species possess both the Ne1 and Ne2 genes. In tetraploid specie s, the hybrid necrosis genes were not identified. The relationship bet ween the geographical origin and frequency of hybrid necrosis genes in samples of T. dicoccum and T. spelta was established. It was demonstr ated that winter and spring forms of T. aestivum (1019 varieties assay ed) differ in the frequency of genotypes Ne1/ne2, ne1/Ne2, and ne1/ne2 , The influence of breeding on variation in frequencies of the hybrid necrosis alleles with different expressivity in common wheat varieties was shown.