Georgi Kikindonov
Agricultural Institute – Shumen, 9700 Shumen, Bulgaria
Kikindonov, G. (2025). Breeding qualities of monogerm dihaploid sugar beet lines. Bulg. J. Agric. Sci., 31(5), 991–996
The successful induction of sugar beet haploids through in vitro cultivation of unpollinated ovules, followed by chromosome doubling of the regenerants, enables the discovery and stabilization of valuable gene recombinants. The objects of our study are doubled regenerants, obtained by in vitro unpollinated ovules of individually selected hybrid monogerm plants. The pollen fertility of the monogerm dihaploids is high; they exhibit full gametophytic self-compatibility, which allows for their use as “O” types of monogerm MS lines. The higher indices of productivity and technological qualities of the dihaploid lines, respectively, their MS analogues, are a precondition for their better appearance as parental components in hybridization. The combining ability of the tested monogerm dihaploid lines regarding the root yield in their triploid crosses is exceptionally high. The 15-4 line has proven higher productivity in its triploid crosses, and the diploid hybrids of 55-4 yield high amounts of root and white sugar per unit area.