Maliyenko V. Improvement of cytplasmic male sterility maintainers of sugar beet with using male sterile forms as primary materials

Thesis include information about developed methods of improvement of CMS-maintainers of sugar beet with using MS-forms as sources of complexes of husbandry useful genes. Optimal methods of creation on the basis of MS-forms male fertile plants with S-cytoplasm (MS-RF), which are male fertile and carry sufficient share of genes of MS-forms, were developed. Particularities of using of MS-RF in crosses with existing CMS-maintainers are presented. Results of selection of CMS-maintainers from hybrid offspring of crosses MS-RF with existing CMS-maintainers show high concentration of CMS maintainers in such primary materials. Testing of hybrids with some MS-analogues of maintainers, which were improved, in Ecological and State plan variety tests, and international competition "Betaintercross" have demonstrated high efficiency of developed methods for improving of CMS-maintainers. Methods of improvement of efficiency of breeding processes, which were developed during research conduction, are presented.