Variability of field population of the bacterial blight (BB) pathogen of rice
1985
Vera Cruz, C.M. | Mew, T.W. (International Rice Research Inst., Los Banos, Laguna (Philippines). Plant Pathology Dept.)
Lesion variance was high on IR8, which is susceptible to all isolates, and on IR20, which is susceptible to races 2, 3, 6, and variable to race 4. On IR1545, which is resistant to all but races 4 and 6, lesion variance was lower than on IR8 and IR20, but increased proportionally with mean lesion length induced by races 4 and 6. This may indicate the inherent variability of the BB pathogen as affected by the nature of resistance of variety. The Xa 4 gene for resistance of IR20 was overcome by the predominant pathogen race
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