The usage of isolation of oil sunflower plants in sowings of tall late-flowering forms of Helianthus annuus L

The isolation of CMS-lines plants with tall sunflower forms from pollen sources causes to decreasing of seeds setting up to 75-87 % in comparison with sunflower samples which were grown without isolation. The seeds yield is reduced as far as CMS- lines plants are moving away from the plants of line- maintainer. Genetic purity of hybrids planted under described method of isolation varied from 76 up to 85 %. The weather conditions in period of sunflower growth significantly influenced on seeds yield. With purpose of a preliminary estimation of a combining ability it is possible to use described isolation of sunflower plants for independent intercrosses, polycrosses and topcrosses.