THE ROLE OF RYE GENOTYPE IN THE POSTGAMIC INCOMPATIBILITY AND FERTILITY OF WHEAT-RYE HYBRIDS

Wheat-rye hybrids of F-1 ABDR (4x = 28), F-2, and F-2 (BC1) produced b y crossing wheat Triticum aestivum L. of the Saratovskaya 29 variety w ith three different populations of the rye Secale cereale L. Onokhoisk aya variety were studied. The three hybrid combinations differed in th e plumpness of Fo hybrid seeds, appearance of F-1 plants with fertile pollen, and in the number of plants producing seeds after backcross to wheat. Experimental evidence for genetic determination of postgamic i ncompatibility and formation of viable gametes (with nonreduced chromo some number) in wheat-rye hybrids were presented. The selection of rye genotypes determining good plumpness of hybrid seeds and viability of gametes in wheat-rye polyhaploids was shown to be expedient.