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Genetic Relationships of Crown Rust Resistance, Grain Yield, Test Weight, and Seed Weight in Oat

^a USDA-ARS, Plant Science Research Unit, Dep. of Crop Science, North Carolina State Univ., Box 7620, Raleigh, NC 27695-7620
^b Dep. of Plant Pathology, Iowa State Univ., Ames, IA 50011

View larger version (37K): [in a new window]   Fig. 1. Development of oat populations using a Design II mating of 10 "rust resistance donor" parents and 10 "yield donor" parents, followed by natural self-fertilization to produce F2 and F3 bulk progenies and F3:5 families from biparental crosses and intermating followed by selfing to produce S1:3 families from 4-way crosses.

View larger version (14K): [in a new window]   Fig. 2. Mean crown rust severity ratings of selected experimental oat lines and cultivars at each of four rating dates in Boone County, IA in 1998. Within each date, mean disease severity was estimated by measuring disease severity on four flag leaves and four second leaves within each of three replicate plots. Days after planting.