Inheritance of leaf rust resistance of wheat line Federation *4/Kavkaz

Abstract

Low seedling reaction of the wheat line Federation*4/ Kavkaz (Lr10 + Lr26) to variant 77-5 of the Indian leaf rust race 77 showing virulence on Lr10 and Lr26 and all other known Lr genes owing their origin to bread wheat was ascribed to a dominant seedling resistance gene. The low terminal disease severity of Federation*4/Kavkaz in field tests against variant 77-5 was ascribed to two dominant genes. One of these two dominant genes is the dominant seedling resistance gene, which remained effective at adult plant stage also. The second gene is an adult plant resistance gene that became operative at adult plant stage only. Because resistance against variant 77-5 is less frequent in bread wheat, the low seedling and adult plant reaction of Federation*4/Kavkaz to variant 77-5 may find an application in wheat breeding programmes.