Photoperiodism and Related Phenomena in Plants and Animals

By Robert B. Withrow | Go to book overview
leaves from light to dark results in a temporary rise in inhibitor, followed by a fall.
4. The quantity of inhibitor in young leaves of Alaska (tall) pea plants greatly exceeds that in analogous portions of Laurel (dwarf) pea plants.
5. Treatment of intact Laurel or Alaska pea plants with gibberellic acid (ca. 10-5M) results in an elevation of inhibitor content in the young leaflets. Similar results, though not so marked, can be obtained by application of GA to excised stem or leaflet tissue.
6. Both the IAA oxidase inhibitor and cofactor (from which the inhibitor may be made by a photoreaction) have been partially purified by solvent techniques and chromatography. The cofactor has been resolved into two fractions, neither of which is active alone.
7. The studies are being pursued in the hope that an understanding of the nature of the inhibitor and of the mechanism of the light control of its synthesis may shed some light on the intermediary biochemistry of photomorphogenesis.

REFERENCES

Brian, P. W., and H. G. Hemming. 1955. "The effect of gibberellic acid on shoot growth of pea seedlings". Physiol. Plantarum, 8, 669-81.

Galston, A. W., and R. S. Baker. 1951. "Studies on the physiology of light action. Ill. Light activation of a flavoprotein enzyme by reversal of a naturally occurring inhibition". Am. J. Botany, 38, 190-95.

Galston, A. W., and L. Y. Dalberg. 1954. "The adaptive formation and physiological significance of indoleacetic acid oxidase". Am. J. Botany, 41, 373-80.

Goldacre, P. L., A. W. Galston, and R. L. Weintraub. 1953. "The effect of substituted phenols on the activity of the indoleacetic acid oxidase of etiolated peas". Arch. Biochem. Biophys., 43, 358-73.

Hillman, W. S., and A. W. Galston. 1957. "Inductive control of indoleacetic acid oxidase activity by red and near infrared light". Plant Physiol., 32, 129-35.

Kenten, R. H. 1955. "The oxidation of indolyl-3-acetic acid by waxpod bean root sap and peroxidase systems". Biochem. J., 59, 110-21.

Mohr, H. 1957. Der Einfluss monochromatischer Strahlung auf das Längenwachstum des Hypocotyls und auf die Anthocyanbildung bei Keimlingen von Sinapis alba L. Planta, 49, 389-405.

Phinney, B. O. 1956. "Growth response of single-gene dwarf mutants in maize to gibberellic acid". Proc. Nall. Acad. Sci. U. S., 42, 185-89.

Piringer, A. A., and P. H. Heinze. 1954. "Effect of light on the formation of a pigment in the tomato fruit cuticle". Plant Physiol., 29, 467-72.

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