COLORIMETRIC ESTIMATION OF INDOLEACETIC ACID

Colorimetric Estimation of Indoleacetic Acid.

The wide use of the auxin, indoleacetic acid, in physiological and biochemical experiments has promoted interest in methods for its colorimetric estimation. MITCHELL and BRUNSTETTER (1) have proposed both the nitrite and the ferric chloride-sulphuric acid tests for the quantitative estimation of indoleacetic acid (IAA) in aqueous solutions, basing their suggested procedures upon a study of opti...

The colorimetric estimation of uric acid in fowl's excreta.

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 ...

A colorimetric reaction for the quantitative estimation of nicotinic acid.

Oxidation of Indoleacetic Acid by Quackgrass Rhizomes.

The enzymatic oxidlation of 3-indoleacetic aci(l (IAA) which was first described in detail by Tang and Bonner (16, 17), has been observed in several types of plants, e.g., fungi (13), ferns (14), monocotyledonous plants (20), and dicotyledonous plants (16, 17, 19). Although differences have been observed in regard to the enzyme's requirement for a phenolic cofactor, and in the pH optimum, the r...