Abstract
Systemic acquired resistance (SAR), one of plant defense systems, is induced by pathogen infection through salicylic acid (SA) accumulation. SAR has been practically utilized in Japan rice fields by exploiting the plant activators capable of induction of SAR, however, the effect of SAR is broken by pathogens. Benzisothiazole (BIT) is a plant activator that induces SAR in rice, tobacco and arabidopsis. In Arabidopsis, environmental stress responses via abscisic acid (ABA) suppresses SAR induction by BIT. Because of the economical importance of the stable induction of SAR, we have investigated the effects of environmental stresses on SAR using rice.
BIT induced the resistance against rice blast fungus, however, these were suppressed by environmental stress pre-treatment. ABM is ABA biosynthesis inhibitor that suppresses effect of environmental stress. ABA treatment reduced the BIT-induced disease resistance. These data indicate that environmental stress response suppresses SAR development on rice.
