To confirm allelic relationship between <i>Lr</i>9 and the leaf rust resistance gene in KLM4-3B, genetics of resistance was studied using crosses (WL711 + <i>Lr</i>9) × WL711 and (WL711 + <i>Lr</i>KLM4-3B) × WL711. The F<sub>2</sub> populations in cross (WL711 + <i>Lr</i>9) × WL711 and (WL711 + <i>Lr</i>KLM4-3B) × WL711 segregated in ratio of 3:1 for disease reaction at seedling stage against pathotype 77-5 of leaf rust. This suggests that rust resistance in these stocks are under the control of single dominant genes. Further, to study allelic relationship between<i>Lr</i> 9 and <i>Lr</i>KLM4-3B, F<sub>2</sub> population of the cross (WL711 + <i>Lr</i>KLM4-3B) × (WL711 + <i>Lr</i>9) was studied. A segregation ratio of 15:1 implies that the two genes <i>Lr</i>9 and <i>Lr</i>KLM4-3B are non-allelic genes.
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