The productivity of the second circle in the recurrent selection of the sunflower phenotype

The purpose of this work is to develop high productive sunflower initial seeds for breeding possessing with improved morphometric traits on plant height, head inclination, and duration of growth and development phases. All researches were conducted at the All-Russia research institute of oil crops by Pustovoit V.S., Krasnodar, in the laboratory of sunflower OP-varieties breeding of the sunflower department. The scheme of sunflower varieties improvement based on recurrent selection on phenotype including the new stage - the nursery of initial seeds for breeding - is suggested. The recurrent selection on a phenotype allowed decreasing of a level of a head inclination in sunflower variety SUR - on 15.2 %, in Oreshek variety - 8.3, and MSG 2205 - 10.4%, and to lower a stalk bend under a head in the variety SUR - on 23 cm, Oreshek - 16, and MSG 2205 - 21 cm, but to keep the high meaning of economically valuable traits. As a result of two circles of the recurrent selection, the new highly productive of initial seeds for breeding of sunflower varieties with improved morphometric traits were obtained. Using these seeds the new sunflower variety VNIIMK 100 was developed, it was included into the State variety register of the breeding achievements of the Russian Federation permitted for production.