. Auxins and plant growth. Auxin; Plant growth promoting substances. indoleacetic acid indolealdehyde Von Denffer and Fischer (1952) have shown that indolealdehyde is in fact a product of the non-enzymatic destruction, and it seems entirely likely that this same product would be produced from the enzymatic destruction as well. There must be further products of the reaction, how- ever, even in the non-enzymatic system, for Brauner (1953) has shown clearly that the indole ring of the auxin is destroyed in light, though at a somewhat slower rate than the destruction of the carboxyl group. He foll
. Auxins and plant growth. Auxin; Plant growth promoting substances. indoleacetic acid indolealdehyde Von Denffer and Fischer (1952) have shown that indolealdehyde is in fact a product of the non-enzymatic destruction, and it seems entirely likely that this same product would be produced from the enzymatic destruction as well. There must be further products of the reaction, how- ever, even in the non-enzymatic system, for Brauner (1953) has shown clearly that the indole ring of the auxin is destroyed in light, though at a somewhat slower rate than the destruction of the carboxyl group. He followed the disappearance of the acidic part of indoleacetic acid by measuring pH changes, and simultaneously followed the destruc- tion of the indole ring by use of the Hopkins-Cole reaction. The auxin was added to a dilute solution of riboflavin and exposed to ultraviolet light for different intervals of time, as shown in figure 45. One sees that the acid group was destroyed most rapidly, but that a simultaneous de-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Leopold, A. Carl (Aldo Carl), 1919-. Berkeley, University of California Press
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