Combining ability for grain yield and malting quality traits in barley (Hordeum vulgare L.)

Rudy Rivas P.1 y Patricio Barriga B.2

Six spring barley (Hordeum vulgare L.) genotypes were crossed in a diallel system to study combining ability for grain yield and twelve malting quality traits. The F1 hybrids behavior was analyzed using Griffing’s Model I, method 2. The analysis for general combining ability (CCG), specific combining ability (CCE) and the relationship CCG/CCE showed that expression of eight out of the thirteen traits were associated with genes which were additive in their effects: grain weight, malt extract, viscosity, friability, malt protein, soluble protein, Kolbach index and free amino nitrogen (FAN). On the other hand, the expression of grain plumpness, extract difference and the Hartong index showed both additive and non-additive genetic control, the former being of greater magnitude. Only grain yield and diastatic power had mainly non-additive control, even though additive effects were also present.

Keywords: combining ability, malting quality.
1 Instituto de Investigaciones Agropecuarias, Centro Regional de Investigación Carillanca, Casilla 58-D, Temuco, Chile. E-mail: rrivas@inia.cl
2 Q.E.P.D. Universidad Austral de Chile. Instituto de Producción y Sanidad Vegetal, Facultad de Ciencias Agrarias, Casilla 567 Valdivia, Chile.