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Published in Crop Sci 24:55-60 (1984)
© 1984 Crop Science Society of America
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Prediction of Three-Way Top Cross Sugarbeet Hybrid Performance1

G. N. Skaracis and G. A. Smith2

A fixed set of inbred and pollinator diploid sugarbeet (Beta vulgaris L.) lines was used to synthesize all possible inbred inbred, and inbred x pollinator single crosses, as well as all possible (inbred x inbred) x pollinator three-way top crosses. Parental lines, and single and three-way cross hybrids were grown in 1980 and 1981. The primary objective of this study was to develop and evaluate various methods to predict the performance of three-way top cross hybrids and secondarily to assess the relative importance of different types of gene effects involved in the expression of root yield, sucrose content, and juice purity in the set of lines used. Predictions based on the mean of the nonparental single crosses, involved in each three-way top cross, were sufficiently reliable and proved equally as good as or better than predictions by other methods investigated. An inbred x pollinator factorial crossing system necessary for this approach also would be compatible with standard sugarbeet breeding procedures. Dominance and additive gene effects proved most important for root yield. Sucrose content and juice purity were controlled only by additive effects. No evidence for significant epistatic effects was found for any of the traits studied.

Key Words: Hybrid vigor • Heterosis • Sugarbeet breeding • Combining ability • Gene action • Epistasis • Beta vulgaris L.

1 Joint contribution of the USDA-ARS and the Colorado State Univ. Exp. Stn. Published with the approval of the Director of the Colorado State Univ. Exp. Stn. as Scientific Paper no. 2825.

2 Formerly graduate research assistant (Present address: Hellenic Sugar Industry, 34, Mitropoleos Street, Thessaloniki, Greece) and research geneticist, USDA, Crops Research Laboratory, Colorado State Univ., Fort Collins, CO 80523.

Received for publication April 25, 1983.




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