Abstract : A total of 32 rice genotypes carrying different dwarf or semi-dwarf genes were inoculated with the
fungus Fusarium moniliforme Sheldon or treated with 50 mg l-1 GA3 in order to select resources resistant to
rice bakanae disease from the dwarf materials. The length of the elongated seedlings was measured, and the
percentage of death of the seedlings after transplanting to field was also counted. A significant correlation was
found between the length of the seedling treated with GA3 and disease injury by bakanae fungus. Rice materials
carrying dwarf gene such as sd1 were not only sensitivity to GA3 but also susceptive to rice bakanae disease.
Materials carrying dwarf gene d1 were insensitive to GA3 but susceptive to bakanae. On the other hand, all
materials carrying d29, sd6 or sdq(t) genes showed resistance to bakanae. The present study indicated that dwarf
and semi-dwarf rice materials might be useful resources for improvement of bakanae resistance in rice breeding
programs.