Inhibitory effects of monoamine oxidase inhibitors on the growth of pea and rice seedlings

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Two monoamine oxidase inhibitors of the hydrazine-type, safrazine and nialamide, inhibited growth in seedlings of rice and pea. We demonstrated histochemically that monoamine oxidase is located chiefly in sieve tubes and in the epidermis of pea seedling. Activity of this enzyme was high in the apical part of the epicotyl, decreasing toward the base. Inhibition of pea monoamine oxidase by safrazine and nialamide was observed histochemically and with an extract from the epicotyl. This supports the hypothesis that indole-3-acetic acid (IAA) is formed from tryptamine by amine oxidase and that inhibition of this enzyme causes lowering of the auxin level, resulting in growth inhibition. Inhibition of growth in rice seedlings by safrazine was reversed by the addition of IAA to the culture medium.
日本植物生理学会の論文