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Breeding Perennial Ryegrass for Resistance to Gray Leaf Spot

Dep. of Plant Biology and Pathology, Rutgers University, 59 Dudley Rd., Foran Hall, New Brunswick, NJ 08901-8520

View larger version (33K): [in a new window]   Fig. 1. Distribution of phenotypes in the parental perennial ryegrass population in the 2000 experiment expressed as percent gray leaf spot disease. The 89 selected parents used for breeding the next generation are denoted by the shaded curve. Six hundred seventy-nine single-plot progenies represented the unselected NJAES germplasm parental population in 2000.

View larger version (52K): [in a new window]   Fig. 2. Distribution of phenotypes in the progeny from selected parents (shaded curve) compared to the unselected perennial ryegrass population in the 2001 experiment expressed as percent gray leaf spot disease. Three hundred and thirty-eight single-plant progenies represented the progeny population from the intercrossing of 89 selected parents. Seventy-two single-plant progenies represented the unselected NJAES germplasm parental ryegrass population from the same unselected gene pool of plants utilized in the original population in 2000.