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Performance of Diallel Crosses of Bromus inermis for Forage Yield¹

Six open-pollinated clones of Bromus inermis were evaluated in a diallel cross. The objectives were to compare the first and second synthetic generations in broadcast plots for forage yield and to obtain information on combining ability. The syn-2 generation usually did not exceed ‘Saratoga’ for forage yield, but the single crosses generally showed improvement for resistance to brown leafspot and leafiness. The average yield in syn-2 was approximately 90% of the syn-1 generation for a 3-year period in two different tests. Significant variances were obtained between years, generations, crosses, and for the cross x generation interaction. Most of the gnetic variance appeared to be additive since the variances due to general combining ability were usually significant in both synthetic generations whereas those due to specific combining ability were rarely significant.

Key Words: Combining ability • Disease resistance • Synthetic generations

² Professor of Agronomy, Plant Science Department, University of New Hampshire, Durham, 03824, and Station Manager, Pioneer Hi-Bred Corn Co., Winterville, N. C. The authors are grateful to Agway, Inc. for financial support for this work and to E. F. McClain, Clemson University, for assistance with the statistical analyses.

Received for publication June 23, 1969.