Out of 395 plants of the F2 population ('Araguaia' x
SC09), 290 were scored as resistant and 105 as susceptible,
showing segregation ratio of 3:1 (resistant/susceptible) in
inoculation tests with P. grisea race IB-45 (Figure 1). These
results indicate that only one dominant gene confers resistance
to race IB-45 (c2 = 0.42, P = 0.5169).