The inheritance of resistance to bacterial blight in a Tongil-type rice cultivar 'Changseongbyeo' was studied using a Korean isolate HB9101. which belongs to race K1 . The resistance of Changseongbyeo to the HB9101 was controlled by a single dominant gene. This gene was allelic with Xa-1 gene and linked to Ig gene on chromosome 4 with the recombination value of 7.5%.