TABLE 2

Qualitative analysis of segregation for bacterial blight resistance in four cotton populations

Disease gradeEmpire B2 Race 2Empire B2b6 Race 2Empire B2b6 Race 18Empire B3 Race 2S295 Race 18
10119032
21088514735
3919131216
4002166
510120
6000100
7012140
831192514
9234481915
106518316
Sum150126126108134
Model3:113:31:33:13:1
χ21.088.32.3895.63.59
P value0.304.0 × 10−30.121.4 × 10−220.06
  • Only phenotypes to Xcm Races 2 and 18 are included, since Races 2 and 4 reactions, and Races 7 and 18 reactions, were closely correlated. A disease grade of <6 was considered to indicate resistance, and the ratio of resistant to susceptible plants was tested against the predicted genetic model. Phenotypic information to Xcm Race 2 was not obtained on 11 individuals in Empire B3, accounting for the discrepancy with total number of individuals.