Heterosis effect in hybrid combinations of dihaploid sugar beet lines
2001
Kikindonov, G. | Kikindonov, Ts. (Agricultural Institute, 9700 Shumen (Bulgaria)
Subject of the research is the effect of heterosis in hybrid combinations (2x and 3x) of monogerm and multigerm dihaploid lines.It was established a supremacy of the hybrids over the parents in regards to their productivity-yield of roots and white sugar yield.A great part of the hybrid combinations demonstrate proved real and hypothetical heterosis (HP and MP) regarding these indices.With small exceptions, the tested hybrid combinations are with positive values of the competitive heterosis effect (CHE) for root yield.Nearly all the diiploid hybrids of the multigerm dihaploids show a negative CHE regarding the sugar content, while in their triploid hybrid combinations the values of CHE for sugar content are positive. The diploid hybrids MS 31112 x Dh 72 with the higest value of CHE for white sugar yield.A high competitive heterosis is registered for the hybrids of the multigerm dihaploids 63 and 58.The triploid hybrids of the dihaploid monogerm lines 150-4 and 19-66 are with significantly higher heterosis effect for white sugar yield than their diploid hybrid combinations. The results of this research confirm the high potential of the dihaploid lines for the heterosis breeding of the sugar beet.
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