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Published online 1 January 2005
Published in Crop Sci 45:8-17 (2005)
© 2005 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Heterosis in a Broad Range of Alfalfa Germplasm

Heathcliffe Ridaya,* and E. Charles Brummerb

a USDA-ARS, U.S. Dairy Forage Research Center, Madison, WI 53706
b Raymond F. Baker Center for Plant Breeding, Dep. of Agronomy, Iowa State Univ., Ames, IA 50011


Figure 1
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  		Fig. 1. Distribution of alfalfa intra- and intersubspecific crosses for total biomass yield and for biomass yield of three individual harvests based on data across 2 yr and two locations in Iowa, USA.

 

Figure 2
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  		Fig. 2. Three measures of heterosis in the progeny of diverse alfalfa germplasm crossed to elite genotypes based on data across 2 yr and two locations in Iowa, USA versus the total yearly biomass yield of the average performance of the parents involved in each cross. In all three graphs, the vertical line represents the average biomass yield of the elite tester populations. (i) High-parent heterosis (R2 = 0.37). The horizontal line represents zero heterosis. (ii) Midparent heterosis (R2 = 0.57). The horizontal line represents zero heterosis. (iii) Halfsib testcross progeny yield (R2 = 0.20). The diagonal line represents 1:1 ratio between axes.

 




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