Breeding perennial ryegrass with a better crown rust resistance
1996
Reheul, D. | Ghesquiere, A. (Centrum voor Landbouwkundig Onderzoek, Merelbeke (Belgium). Rijksstation voor Plantenveredeling)
Improving the crown rust resistance is one of the main goals in our breeding programme. We select both after artificial infections and after natural epidemics on several locations. We present the relationship between: the rust resistance in parents and their offspring and between the rust resistance and the dry matter yield and the digestibility. Furthermore we present data on the variability of the rust resistance during several years and on several locations and on the relevance of the artificial infections. All results are based on large numbers of observations. The heritability of the rust resistance is high, opening a good scope to improve the disease resistance. This optimism is hampered by the negative correlation with the yield. There is no decline in digestibility to expect. The incidence of crown rust is very variable between years, locations and between spontaneous and artificial infections, creating constraints in the selection. Observations during several years on several locations seem to be the best solution.
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