Estimating breeding parameters in a New Zealand blackcurrant (Ribes nigrum L.) breeding programme
Breeding parameters were estimated for a blackcurrant breeding population from a series of 4×4 disconnected factorials planted at Plant & Food Research, Motueka, New Zealand. Variance components, heritability, additive genetic correlations and breeding values were estimated for agronomic and fruit-quality traits using mixed models and were used to discuss the strategies to apply to select parents for blackcurrant breeding. These parameters provided insight into the strategies to apply to selecting parents for a breeding population. Some trait heritabilities were high in this blackcurrant population, which would allow phenotypic selection of parents, but the key trait of juice yield had a low heritability, so selection strategies for parents in this population need to be based on breeding value rather than phenotype. Combining multiple traits with some negative additive genetic correlations together in a selection index illustrated the need for careful selection of the weights. More than one selection index could be used to maximise gain for different product concepts.
Currie, A.J. and Alspach, P.A. (2016). Estimating breeding parameters in a New Zealand blackcurrant (Ribes nigrum L.) breeding programme. Acta Hortic. 1127, 185-190
variance components, narrow-sense heritability, additive genetic correlations, selection index