Donors of ultra-earliness for spring common wheat breeding

Knowledge of productivity and genetic control the rate ultra-early lines development will facilitate their use in breeding common wheat Tritium aestivum L. for high adaptive capacity. The research focused on Rico (k-65588), Rimax (k-67257) (progeny F 3 × ‘Max’, k-57181), Fori 1-8 line series 4 ‘Photon’ Rico) Rifor 1-13 7-8 ‘Forlani Roberto’), as well accessions (k-55696) Roberto’ (k-42641). varieties ‘Leningradskaya 6’ (k-64900) 97’ (k-62935) were used standards VIR, ‘Chelyaba 2’ (k-64379) was Сhelyabinsk ARI. alleles Vrn Ppd genes identified by PCR using published allele-specific primers. Responses to vernalization (30 days at 3°C) a short 12-hour day determined according VIR guidelines. ultra-earliness is associated with presence dominant Vrn-A1 , Vrn-B1 Vrn-D1 Ppd-B1 Ppd-D1 possibly Eps . shortest emergence-to-heading period two experimental locations noted (39.9 ± 1.49 days), which 14.8 1.22 earlier than region-adapted varieties. genotype contains Vrn-D1, In genotype, different found, being result recombination processes ‘Max’ hybrids. Under photoperiod (12 hours), can interact cumulative polymeric mode, not case long-day environments. Unlike other lines, 5, Roberto’, have recessive vrn-A1a allele. However, 5 do respond vernalization, while responsive this factor. absence response possessing allele provided complex modifier along gene, formed during Recombinants spring wheat, combining relatively ear productivity, been identified. Grain yield per 1 m 2 new some years reach 90% that 97’. It expedient donors high-rate breeding, considering peculiarities source lines.