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633.112 в ղ̲ ò ʲ ˲ ʲ .. ...

-- [ 1 ] --

The study of stability of genetic parameters of sugar beets in different growing conditions is of

certain interest. The purpose of the research is to study the variability of combining ability of

single-cross sterile hybrids of sugar beets depending on feeding area. Methods of research. 20

single-cross sterile hybrids received from top-cross breeding, 5 MS-lines and 5 sterility fixers were

tested in two different growing conditions with the feeding area 4522,5 and 4545(cm2).

Research results. On the basis of dispersive analysis it was established that there are considerable differences between experimental single-cross hybrids according to their yielding capacity both on UFA (usual feeding area) (Ffact.=7,38Ftheor=2,01)and on EFA (extended feeding area (Ffact.=21,76Ftheor.=2,01) which made it possible to estimate the combining ability of MS-lines and SF (sterility fixers). The genetic structure of variability of yielding capacity features, GCA (general combining ability) and SCA (specific combining ability) effects were defined. Conclusions.

Feeding area is a modifying factor which influences the expression of combining ability. Three hybrids (MS 1/Ot 5, MS 3/Ot 2, MS 4/Ot 5) with stable display of reliably high effect of heterosis as well as three hybrids (MS 1/Ot 2, MS 1/Ot 3, MS 4/Ot 3) with high flexibility by the index of yield were singled out.

Keywords: combining ability, hybrids, yielding capacity, feeding area, heterosis.

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