SEX INHERITANCE IN APOMICTIC SEEDLINGS OF GARDEN STRAWBERRY (FRAGARIA-ANANASSA DUCH)

The experimental data are presented on flower sex inheritance in apomi ctic seedlings (AS) of octoploid garden strawberry (Fragaria ananassa) . Apomixis in garden strawberry was induced using pollination with pol len from wild specie strawberry Fragaria orientalis (2n = 28) and Frag aria moschata (2n = 42). Two species having hermaphroditic flowers ('' Zarya'' and ''Festival' naya'') and two species with female type flowe rs (''Mitsi Shindler'' and ''Komsomolka'') were used as a female plant . ASs of bisexual flower plants had die same phenotype as a female pla nt. There was a segregation of female type flower plant ASs onto two p henotypes: plants with female type flowers and bisexual flower plants. A model of chromatid segregation in octoploids with diplosporic embry o sac initial cell formation was used as a theoretical model. Female f lower type plants were shown to carry one dominant suppressor allele ( Su(M), which suppress microsporangium development and microsporogenesi s) and seven recessive alleles (Su+) in their genotype. Recessive homo zygote segregation results in appearance of AS with hermaphroditic flo wers. The main megasporogenesis anomaly was found to be lacking of the second meiotic division resulting in megagametophyte unreduction. Dip losporic apomixis of Taraxacum type realizes genetic consequences of r ecombinogenesis in progeny. Apomictic way of seed formation in strawbe rry plants with female type flowers permits a transition from allogamy to autogamy during one generation. One of the ways of variability ori gin in apomixis was shown.