Distribution of Indoleacetic Acid Oxidase and Inhibitors in Light-Grown Cotton

Distribution of Indoleacetic Acid Oxidase and Inhibitors in Light-Grown Cotton.

Extracts of green plant tissues exhibiting IAAoxidase activity characteristically contain inhibitors of the enzyme (4, 11). The high concentration of such inhibitors prompted the discoverers of IAAoxidase to suggest that the system does not function in green tissue (16). Later, Galston and Dalberg (6) found that in etiolated tissue the in vitro IAAoxidase activity increases with age or IAA trea...

Indoleacetic Acid Oxidizing Enzyme & Inhibitors from Light-Grown Cotton.

Stimulation of indoleacetic Acid oxidase and inhibition of catalase in cotton extracts by plant acids.

Activity of indoleacetic acid oxidase in partially purified extracts from cotton is stimulated by small amounts of malate, succinate, fumarate, and other plant acids. The stimulation is apparently due to inhibition of catalase, which is detectable in certain preparations. The lag phase of indoleacetic acid oxidation by crude preparations is eliminated by steps in processing which conceivably ei...

Effect of manganese toxicity on the indoleacetic Acid oxidase system of cotton.

The effect of substrate manganese on tissue manganese levels and activity of the indoleacetic acid (IAA)-oxidase system of cotton (Gossypium hirsutum, L.) was investigated. A sand culture technique was used with 1, 3, 9, 27 and 81 mg manganese (MnSO(4)) per liter nutrient solution applied in various experiments.The following relationships held for both long-term (126 days) and short-term (12-14...

Promotion of indoleacetic Acid oxidase isoenzymes in tobacco callus cultures by indoleacetic Acid.

Indoleacetic acid oxidase in tobacco callus cultures (Nicotiana tabacum L., cv. White Gold) was composed of at least two groups of isoenzymes, which were distinctly different in electrophoretic mobilities and in responses to growth substances. Indoleacetic acid had dual effects; at low concentrations it promoted the development of two fast-migrating indoleacetic acid oxidase isoenzymes, but at ...