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Sunflower commercial hybrid yana, developed with mutant restorer line r 12003

Encheva, J., Shindrova, P., Encheva, V., Penchev, E.
Helia 2014 v.35 no.56 pp. 47-60
Helianthus annuus, Plasmopara, heterosis, hybrids, immunity, mutants, races, seed yield, seeds, ultrasonics
Hybrid Yana was developed with simple cross of Bulgarian line cms2607 and mutant line R12003. Mutant line was produced after treatment of immature sunflower (Helianthus annuus L.) zygotic embryos of fertility restorer line R 2574 with ultrasound. In 2004, 2006 and 2007 years hybrid Yana was presented for testing at State Variety Testing Commission. The hybrid considerably exceeded the mean standard (the Bulgarian commercial hybrid Albena and French commercial hybrid Diabolo) by seed yield. The seed yield of hybrid Yana was significantly higher with 31 kg/dka, or 9.8%. The correlations of the cross cms2607 × R12003 with the mean values of the parental lines (h1) and with the mean value of the parent with higher indices (h2) were statistically significant. In h1 the variation was from 152.4% to 1471.2%; in h2 the variation was within 149.5-1052.9%. The evaluation of the heterosis effect parameters proved that the parent with the higher values of the indices was superdominant. This was markedly expressed for indices total seeds number per head and seed yield per head. Hybrid Yana possessing immunity to the Orobanchecumana population of races A-F and immunity to Plasmopara helianhi-races 300, 700 and 731.