The controlled cross-pollination between parents of maize hybrids commonly is effectuated by detasseling of female parent before silking and application of citoplasmic male sterility – cms. After the epidemic of Helminthosporium maydis in USA cms -T type was abandoned and S (M) and C cytoplasms become important from early 1980 s in maize seed production. The study of inbreds from 21 germplasm groups and subgroups indicated that for cms-M type most of them (85.7%) were sterility fixers, and only 3.2 % carried dominant genes responsible for complete pollen fertility restoration. Comparable percentages of sterility fixers (41.2 %) and restorers (44.5%) were observed, when the same genotypes were tested in cms-C type. The specific responses of inbred lines from different groups of germplasm were determined. Northern flint lines were fixers of M and C types of sterility and only two lines developed from variety Gelber Land Mais containing dominant genes of pollen fertility restoration of cms-C. Similar fixation responses in both types of cms were established for 9 dent lines derived from subgroupe CG12, 8 inbreds related to A654 and 6 lines derived from Northwestern Dent germplasm. Subgroups Mo17 and Oh43 from Lancaster germplasm predominantly contained recessive alleles for both types of cms. Inbreds from BSSS-B14, BSSS-B37, Reid Iodent heterotic groups and related to lines Co72-75 and Co125 were natural complete or partial restorers in testcrosses with cms-C testers. New inbred lines are usually tested for response to cms of both types simultaneously with evaluation for combining ability. For sterility conversion, backcrossing starts, when an inbreed line is transferred into an operative collection. Transformation to pollen fertility restoration occurs 3 years after selection of the best hybrid combinations in trials. Plants with cms C-type are completely sterile, and restoration of pollen fertility is more easily accomplished. Lack of this type of sterility leads to a high percentage of genotypes, restabilizing pollen fertility after 7-10 days. Another defect is specific expression of sterility-restorer in different genetic background. Non-viable anthers exposed from glumes and production of fertile pollen in some environments are characteristic for some cms-M analogues. Over 150 inbred lines have been converted into cms, and about 15 % were used as female parents of registered hybrids. The procedure of restorer development is more complicated and requires large numbers of backcrossed progenies, testcrosses with sterile parents for identification of dominant genes. Our investigations confirmed that the genetic control of pollen fertility in cms-M background is complicated and that some additional alleles with complementary effects are involved. At present, the female parents of 10 registered hybrids are cms-M versions and for 3 hybrids female parents with cms-C sterility were created. Five lines converted to cms-M restorers of fertility and 3 inbred lines as natural CRf restorers are involved as male parents of registered hybrids.