Detection and Characterization of Abscission-Inhibiting Substances in Leaves of Malformin-Treated Cuttings

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Malformin, which induces resistance to dark leaf abscission following treatment in the light, did not alter the course of dark aging (loss of chlorophyll, wet and dry weight) in Vigna. Peroxydisulfate, which destroys IAA, did not influence malformin-induced abscission resistance. Leaf blades from cuttings treated with malformin in the light contained higher levels of abscission inhibitors, which could be divided into ethanol-soluble and water-soluble fractions. The inhibitors appeared to be heat stable anions that are insoluble in ether. Although malformin also increased the amount of abscission inhibitors in leaves when applied in the dark, where malformin stimulates abscission, a parallel increase in abscission stimulators may explain the failure of these inhibitors to function in the dark.
日本植物生理学会の論文