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Inheritance of Combining Ability for Forage Traits in Bromegrass (Bromus inermis Leyss)¹

Synopsis: Topcross progeny evaluations of 18 S₀ clones of bromegrass and 10 S₁ selections from each in solid seedings indicated that combining ability is heritable and that segregation for combining ability occurs upon selfing. S₀ clones averaged significantly higher than their S₁ progenies in mean combining ability for forage yield and leaf disease score. Previous evaluations of parental material in spaced and wide-row plantings were of little value for predicting combining ability as measured by topcross performance in solid seedings. S₁ progenies showing most inbreeding depression and yielding least tended to give best topcross yields.

² Research Associate and Associate Professor of Farm Crops, Iowa State College, respectively.

Received for publication January 27, 1956.

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