. The chemistry and mode of action of plant growth substances; proceedings of a symposium held at Wye College, University of London, July 1955. Plant regulators; Auxin; Growth (Plants). -CH2-CH-COOH NH, CH, —C —COOH ^ II NH Indolylimmopnopionic acid CH2-C —COOH II 0 NH'"" Indolylpyruvic acid ^^ NH Indolylethylidenimine CH, —C .^ =N NH Indoljlacetaldehyde. NH Indolylacetonitrile f?^^>^ ^CH2 —CNHz ,^ 0 NH' Indoljlacetamide NH' Indolylacetic acid Figure 1. Potential pathways of tryptophan conversion to indoleacetic acid {after Reinert, 1954). the micro-organism was dependent upon the
. The chemistry and mode of action of plant growth substances; proceedings of a symposium held at Wye College, University of London, July 1955. Plant regulators; Auxin; Growth (Plants). -CH2-CH-COOH NH, CH, —C —COOH ^ II NH Indolylimmopnopionic acid CH2-C —COOH II 0 NH'"" Indolylpyruvic acid ^^ NH Indolylethylidenimine CH, —C .^ =N NH Indoljlacetaldehyde. NH Indolylacetonitrile f?^^>^ ^CH2 —CNHz ,^ 0 NH' Indoljlacetamide NH' Indolylacetic acid Figure 1. Potential pathways of tryptophan conversion to indoleacetic acid {after Reinert, 1954). the micro-organism was dependent upon the amount of tryptophan present in the medium, and roughly proportional to the extent of aeration, the oxidative deamination of tryptophan to indolepyruvic acid (IPyA) followed by oxidative decarboxylation of the keto acid to lAA was postulated. This picture was strengthened subsequently by Wildman, Ferri, and Bonner (1947), who showed that leaf enzyme preparations could convert tryptophan to auxin or lAA, and that IPyA could also function as a source of auxin. Since Skoog (1937) found that tryptamine as well as tryptophan was converted slowly to auxin when applied to coleoptiles, the alternative pathway of tryptamine oxidation to lAA via indoleacetaldehyde was proposed. The existence of this dual pathway was also suggested by the results with whole tissue and enzyme preparations of the pineapple leaf. With these materials, the tryptophan to indoleacetaldehyde to lAA reactions apparently took 66. 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 Wye College; Wain, R. L; Wightman, F. (Frank). London, Butterworths Scientific Publications
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Keywords: ., bookcentury1900, bookcollectionbiodiver, booksubjectgrowthplants
