. Auxins and plant growth. Auxin; Plant growth promoting substances. 90 Fundamentals of Auxin Action struction of the indole ring also occurred. A different type of prod- uct of auxin destruction has been proposed by Siegel and Weintraub (1952), who found that auxins combine with peroxides to form some complex which can then be restored to indoleacetic acid upon removal of the peroxides by catalase or other reagents. Some evidence has been advanced to indicate that peroxides may be formed as a product of _l UJ or < <. > The Indole Ring °^^—^The Acid Group 10 TIME IN LIGHT 15 20 MIN. F
. Auxins and plant growth. Auxin; Plant growth promoting substances. 90 Fundamentals of Auxin Action struction of the indole ring also occurred. A different type of prod- uct of auxin destruction has been proposed by Siegel and Weintraub (1952), who found that auxins combine with peroxides to form some complex which can then be restored to indoleacetic acid upon removal of the peroxides by catalase or other reagents. Some evidence has been advanced to indicate that peroxides may be formed as a product of _l UJ or < <. > The Indole Ring °^^—^The Acid Group 10 TIME IN LIGHT 15 20 MIN. Fig. 45. Relative rates of disappearance of the indole ring (as determined by the Hopkins-Cole Test) and the acid group (as determined by pH) of indoleacetic acid during photo-destruction with riboflavin (Brauner, 1953). the enzymatic destruction of auxin (Andreae and Andreae, 1953). Thus it appears that indolealdehyde is one product of auxin destruction, though it may be further degraded, and perhaps even different path- ways of destruction may be followed. Several materials can alter the enzymatic destruction of auxin. For example, scopoletin, a naturally occurring lactone, is a competitive inhibitor of the reaction (Andreae, 1952). Many compounds which can. 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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