Task: Class Definition Understanding (ontology: Food_Agriculture/Crop_Ontology)

Which of the following definitions best describes 'Stem rust infection type seedling NA25'?

A. Observe relative or absolute area of plant tissue affected by Stem rust and record it. Often severity is represented as a proportion or percentage of plant surface affected.
B. Visual assessment of the phenotype score using a 0-9 scale: 0= perfect, 1= excellent, 4= good, 5= borderline, 6= poor, 9= unadapted
C. Observe relative or absolute area of plant tissue affected by Oat mosaic virus and record it. Often severity is represented as a proportion or percentage of plant surface affected.
D. A qualitative analysis of the type of disease symptoms exhibited by seedlings inoculated with stem rust (Puccinia graminis f. sp. avenae) race NA25 during greenhouse trials. Ratings made using the scale from Stakman et al. (1962): immune= 0, very resistant= 1, moderately resistant= 2, moderately susceptible= 3, and very susceptible= 4.

Answer: A qualitative analysis of the type of disease symptoms exhibited by seedlings inoculated with stem rust (Puccinia graminis f. sp. avenae) race NA25 during greenhouse trials. Ratings made using the scale from Stakman et al. (1962): immune= 0, very resistant= 1, moderately resistant= 2, moderately susceptible= 3, and very susceptible= 4.