Skip to main content
NCBI home page
Plant Physiology logoLink to Plant Physiology
. 1969 Sep;44(9):1211–1216. doi: 10.1104/pp.44.9.1211

Blockage by Gibberellic Acid of Phytochrome Effects on Growth, Auxin Responses, and Flavonoid Synthesis in Etiolated Pea Internodes 1

D W Russell a,2, A W Galston a
PMCID: PMC396246  PMID: 16657193

Abstract

Red light inhibits the growth of etiolated pea internodes, causes a shift toward higher indoleacetic acid (IAA) concentrations in the IAA dose-response curve of excised sections, and promotes the synthesis in intact internodes of kaempferol-3-triglucoside. Gibberellic acid (GA3) prevents all 3 effects, the first effect substantially and the last 2 completely. This suggests GA3 blockage of an early or basic event initiated by the active form of phytochrome. The red light-induced shift in the IAA dose-response curve of excised sections is consistent with a light-induced increase in the activity of an IAA destruction system, since the magnitude of the red light inhibition varied with IAA concentration. The red light and GA3 effects on growth and on flavonoid synthesis are consistent with the view that phytochrome may control growth by regulating the synthesis of phenolic compounds which act as cofactors in an IAA-oxidase system. GA3 reversal of the red light-induced shift in the IAA dose-response curve involves both growth promotion and inhibition by GA3 at different IAA concentrations and this, together with the GA3 reversal of light-induced flavonoid synthesis, supports the suggested regulatory role of phenolic compounds in growth.

Full text

PDF
1211

Selected References

These references are in PubMed. This may not be the complete list of references from this article.

  1. Fletcher R. A., Zalik S. Effect of Light Quality on Growth and Free Indoleacetic Acid Content in Phaseolus vulgaris. Plant Physiol. 1964 May;39(3):328–331. doi: 10.1104/pp.39.3.328. [DOI] [PMC free article] [PubMed] [Google Scholar]
  2. Furuya M., Thomas R. G. Flavonoid Complexes in Pisum sativum. II. Effects of Red and Far-Red Light on Biosynthesis of Kaempferol Complexes and on Growth in Etiolated Plumules. Plant Physiol. 1964 Jul;39(4):634–642. doi: 10.1104/pp.39.4.634. [DOI] [PMC free article] [PubMed] [Google Scholar]
  3. Kende H., Lang A. Gibberellins and Light Inhibition of Stem Growth in Peas. Plant Physiol. 1964 May;39(3):435–440. doi: 10.1104/pp.39.3.435. [DOI] [PMC free article] [PubMed] [Google Scholar]
  4. Lockhart J. A. REVERSAL OF THE LIGHT INHIBITION OF PEA STEM GROWTH BY THE GIBBERELLINS. Proc Natl Acad Sci U S A. 1956 Nov;42(11):841–848. doi: 10.1073/pnas.42.11.841. [DOI] [PMC free article] [PubMed] [Google Scholar]
  5. Lockhart J. A. Studies on the Mechanism of Stem Growth Inhibition by Visible Radiation. Plant Physiol. 1959 Jul;34(4):457–460. doi: 10.1104/pp.34.4.457. [DOI] [PMC free article] [PubMed] [Google Scholar]
  6. Ockerse R., Galston A. W. Gibberellin-auxin interaction in pea stem elongation. Plant Physiol. 1967 Jan;42(1):47–54. doi: 10.1104/pp.42.1.47. [DOI] [PMC free article] [PubMed] [Google Scholar]
  7. Russell D. W., Conn E. E. The cinnamic acid 4-hydroxylase of pea seedlings. Arch Biochem Biophys. 1967 Oct;122(1):256–258. doi: 10.1016/0003-9861(67)90150-6. [DOI] [PubMed] [Google Scholar]
  8. Zucker M. Induction of Phenylalanine Deaminase by Light and its Relation to Chlorogenic Acid Synthesis in Potato Tuber Tissue. Plant Physiol. 1965 Sep;40(5):779–784. doi: 10.1104/pp.40.5.779. [DOI] [PMC free article] [PubMed] [Google Scholar]

Articles from Plant Physiology are provided here courtesy of Oxford University Press

RESOURCES