. Biochemistry of plants and animals, an introduction. Biochemistry. 282 PLANT BIOCHEMISTRY lip is removed and inverted, the growth hormone is transported irom the apical portion to the original basal portion but not in the other direction. In addition to indoleacetic acid several other compounds have been isolated from plants which seem to have growth-promoting properties. Indolepyruvic acid has been identified in plants by chromatographic techniques. Although this compound is known to have giowth-pro- moting activity, the tact that it is readily broken down to indoleacetic acid makes it diff

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. Biochemistry of plants and animals, an introduction. Biochemistry. 282 PLANT BIOCHEMISTRY lip is removed and inverted, the growth hormone is transported irom the apical portion to the original basal portion but not in the other direction. In addition to indoleacetic acid several other compounds have been isolated from plants which seem to have growth-promoting properties. Indolepyruvic acid has been identified in plants by chromatographic techniques. Although this compound is known to have giowth-pro- moting activity, the tact that it is readily broken down to indoleacetic acid makes it diff Stock Photo
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. Biochemistry of plants and animals, an introduction. Biochemistry. 282 PLANT BIOCHEMISTRY lip is removed and inverted, the growth hormone is transported irom the apical portion to the original basal portion but not in the other direction. In addition to indoleacetic acid several other compounds have been isolated from plants which seem to have growth-promoting properties. Indolepyruvic acid has been identified in plants by chromatographic techniques. Although this compound is known to have giowth-pro- moting activity, the tact that it is readily broken down to indoleacetic acid makes it diff
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. Biochemistry of plants and animals, an introduction. Biochemistry. 282 PLANT BIOCHEMISTRY lip is removed and inverted, the growth hormone is transported irom the apical portion to the original basal portion but not in the other direction. In addition to indoleacetic acid several other compounds have been isolated from plants which seem to have growth-promoting properties. Indolepyruvic acid has been identified in plants by chromatographic techniques. Although this compound is known to have giowth-pro- moting activity, the tact that it is readily broken down to indoleacetic acid makes it difficult to assay its role as a growth hormone. Three other compounds possessing growth-stimulating jjroperties have been identified in plants, although their role as growth hormones is obscme. These substances are r/,?-cinnamic acid, phenylacetic acid, and indoleacetonitrile. In all probability there are still other growth hormones not yet identified, although it seems quite clear that indole- acetic acid is by far the most common. A large number of synthetic compounds with growth-stimulating properties similar to indoleacetic acid have been produced. These synthetic compounds, together with the natinally occurring growth substances, have been given the general name auxin. Certain naphtha- lene derivatives were among the first synthetic compounds to be exam- ined for auxin activity. 1-Naphthaleneacetic acid is widely used as an overall growth-stimidating substance. It is particularly useful in the rooting of cuttings and in the treatment of seeds before germination. 2-Naphthoxyacetic acid is particularly useful in setting of seedless fruit (parthenocarpy) by the application of this substance to the pistils of various flowers. CH2COOH ^ ^ -OCH2COOH. \^ l-naphthaleneacetic acid 2-naphthoxyacetic acid (NAA) (NOA) In addition to those organic compounds containing naphthalene or indole rings, certain synthetic benzene derivatives produce growth responses in plants. Both phenylacetic a