Light-Enhanced Resistance to Magnaporthe grisea Infection in the Rice Sekiguchi Lesion Mutants

The rice sl mutant showed two types of responses to Ma`naporthe `risea infection by light treatments[ One was an sl!mutant!type response characterized by Seki! guchi lesion expression under light waves of 399 699 nmand the other was a wild!type response characterized by blast and:or necrotic spot lesion expression in the dark or at wavelength between 189 and 229 nm[ There was a large di}erence in the resistance to M[ `risea infection between the mutant! and wild!type responses in the rice sl mutant[ When the mutant!type response was induced in the rice sl mutant\ the disease resistance was enhanced relative to that in the wild!type response[ Enhanced resist! ance was demonstrated by two components] "a# the num! ber of Sekiguchi lesions was reduced relative to that of blast or necrotic lesions^ "b# sporulation of M[ `risea was not induced in Sekiguchi lesions[ The enhanced resistance was dependent on light of 399 699 nm[