Bio-organic Chemical Studies on Production Mechanism of Resistance Regulating Substances in Plants

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Phytoalexins have been defined as compounds formed or activated in a living plant cell in contact with fungi, which are antifungal and thereby prevent the full development of the incipient disease.Elicitors are considered to be agents which cause the accumulation of phytoalexins in higher plants. While various exogenous elicitors have been known, there are few reports of exact isolation of an endogenous elicitor, which has been deduced to exist in plants. We could indicate that hydrogen peroxide is a general and direct trigger substance for phytoalexin production and would activate or increase the presumable endogenous elicitor. These characteristics of hydrogen peroxide were found with potato, sweet potato, kidney bean, and sugar beet. Next, we have attempted isolation of an endogenous elicitor, which increases in potato tissues in contact with hydrogen peroxide. At the present stage, we could refine a compound having the elicitor activity in an almost pure state.