ENHANCEMENTS OF DISEASE RESISTANCE AND PRODUCTIVITY IN POTATO PLANTS BY INDUCTION TREATMENT OF PLANT IMMUNIZATION

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On the basis of plant immunization, that plant systemically acquire the disease resistance against virulent pathogens by treatment of partial portion of the plants with agents causing hypersensitive reaction, we investigated the principle of systemic induced resistance and physiological shifts in potato plants against late blight and their application for practical production of potatoes and got the following results.(1) Efficient induction of systemic resistance was obtained by inoculation of cultivars with R gene with incompatible race O, treatment with every cultivars with fungal wall elicitors, hydrogenperoxide solution containing CaCl_2, and suspensions of arachidonic acid and peroxides derived from linolenic acid on lower leaves of plants or cut surface of seed tubers.(2) The positive effect of immunization treatments appeared especially in the case of short-period culture at moderate temperature as transient enhancement of plant growth, enhanced resistance to late blight and stimulated tuberization and tuber yield.(3) Plant immunization by inoculation with incompatible race or treatment with hyphal wall elicitor immediately stimulated the O2-generating system, followed by phospholypase A2 and Lipoxygenase, suggesting involvement of metabolism of lipid peroxides in systemic signalling.(4) Upon plant immunization treatment, systemic activations of superoxide generation, superoxidedismutase and peroxidase were shown in relation to acquired resistance based on failure of fungal penetration and/or induction of hypersensitive-type cell response.(5) Further researchs on signalling system inundation of plant immunization and development of agents for induction of plant immunization on the basis of them.