Abstract
The object of research were: hybrid grains F<sub>1</sub> of winter rye resulting from the topcross of nine yellowseed inbred lines with two testers Madar and Krótka I, and six hybrids F<sub>1</sub> of spring rye resulting from topcross of six Turkish yellowseed populations with the tester SMH-02. The aim of the analysis was to confirm the degree of crossing ability and the effect of xenia of 1000 grains weight. The possibility to breed initial materials characterized by a high combining ability by means of xenia was stated. Xenia of 1000 grains weight allows to elaborate a new technology of hybrid seed production of rye.
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