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Changes in Peroxidase Isoenzymes in Tomato Galls Induced By Meloidogyne Incognita1)

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All of the twelve isoperoxidases detectable for tomato somatic organs are present in the root systems. From the point of origin on starch gel electrophoreograms, those moved toward the cathode are in the order named 1C, 2C, 3C, 4C, 5C and 6C. Those in the anodic end are coded as 1A, 2A, 3A, 4A, 5A and 6A. Only 5A, 6A and occasionally 4A are detected from a normal stem. Induction of stem galls with root knot nematodes, however, induces syntheses of cathodic 2C, 3C, 5C, 6C, occasionally 1C and anodic 2A as well as 4A isoperoxidases in addition to the two anodics regularly present in the normal stem. Syntheses of cathodic extra isoenzymes in stem galls are detectable 12 hours after inoculation. Highest number of isoperoxidases can be found in stem galls between two days and one month of age. Cathodic members decreased in the older galls. Gall development also enhances syntheses of the three anodic isoenzymes in normal stems and the stimulation persists to the four-month old galls. Induction of root galls by the nematodes increases the concentration of a few isoenzymes but does not qualitatively alter the isoperoxidase population of a normal root system.

Affiliations: 1: Plant Nematology Laboratory, Institute of Botany, Academia Sinica, Nankang, Taipei, Taiwan


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