Abstract
Isozyme types were determined for six cultivar groups carrying different resistance to rice bacterial blight in Asia. The temporarily proposed Isozyme genotypes would be associated with the differentiation of the reaction of resistance. The predominant type of the Java 14 group was Isozyme type VI-1, and type II-4 was involved as the second predominant type. The majority of the DZ 192 group belonged to type II-1 and II-2. A newly assigned TN 1 group consisted of Isozyme type I and VI / . The predomi-nant occurrence of I-1 and I-2 was common among the TKM 6, Cas 209, Mond Ba and TN I groups. However, frequent involvement of IM-1 and IM-2 were specific to the TKM 6 group. The frequent presence of I-4 and I-5 was the characteristic of the Cas 209 and Mond Ba groups. Based on these observations the ecotypic diversity of each group was discussed.
