Breeding for a better crown rust resistance in perennial ryegrass
1996
Ghesquiere, A. (Centrum voor Landbouwkundig Onderzoek, Merelbeke (Belgium). Station voor Plantenveredeling) | Reheul, D.
Improving the rust resistance is one of the main goals in our breeding programme with perennial ryegrasses. We have studied the behaviour of our breeding material over several years in several locations under natural and artificial conditions. The narrow sense heritability of the crown rust resistance is fairly high (0.46), opening a good scope to improve the disease resistance. This optimism is hampered by the negative correlation with the yield. The most resistant material yielded 4 per cent less than the most susceptible material. There is no decline in digestibility to expect when improving the disease resistance. The incidence of the crown rust is very variable between years, locations and between spontaneous and artificial infections, creating constraints in the selection. Observations during several years and at several locations seem to be the best way to improve the rust resistance in perennial ryegrass.
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