Skip to main content
NCBI home page
Plant Physiology logoLink to Plant Physiology
. 1975 Aug;56(2):263–266. doi: 10.1104/pp.56.2.263

Additive and Synergistic Effects of Kinetin and Ethrel on Germination, Thermodormany, and Polyribosome Formation in Lettuce Seeds 1,2

V Sivaji Rao a, Narendra Sankhla a,3, Anwar A Khan a
PMCID: PMC541801  PMID: 16659284

Abstract

The inhibition of germination of Grand Rapids lettuce (Lactuca sativa L.) seeds at 35 C was removed to a marked extent by kinetin and 2-chloroethylphosphonic acid (ethrel). When both compounds were used together, an additive effect was observed. A synergistic effect was, however, noted when ethrel promoted the kinetin reversal of abscisic acid inhibition of seed germination (light- as well as gibberellic acid-, induced). Both kinetin and ethrel increased the total ribosomal material and the percentage of polyribosomes in lettuce seeds imbibed in the light for 24 hours. A combination of the two compounds showed a synergism in polyribosome formation only at high ethrel concentration. The inability of ethrel to reverse abscisic acid inhibition indicates that kinetin action cannot always be substituted by ethrel. The possible mechanisms involved in the enhanced response by a combination of kinetin and ethrel are discussed.

Full text

PDF
263

Selected References

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

  1. Esashi Y., Leopold A. C. Dormancy regulation in subterranean clover seeds by ethylene. Plant Physiol. 1969 Oct;44(10):1470–1472. doi: 10.1104/pp.44.10.1470. [DOI] [PMC free article] [PubMed] [Google Scholar]
  2. Fuchs Y., Lieberman M. Effects of Kinetin, IAA, and Gibberellin on Ethylene Production, and Their Interactions in Growth of Seedlings. Plant Physiol. 1968 Dec;43(12):2029–2036. doi: 10.1104/pp.43.12.2029. [DOI] [PMC free article] [PubMed] [Google Scholar]
  3. Fuchs Y., Lieberman M. Effects of Kinetin, IAA, and Gibberellin on Ethylene Production, and Their Interactions in Growth of Seedlings. Plant Physiol. 1968 Dec;43(12):2029–2036. doi: 10.1104/pp.43.12.2029. [DOI] [PMC free article] [PubMed] [Google Scholar]
  4. Ketring D. L., Morgan P. W. Ethylene as a Component of the Emanations From Germinating Peanut Seeds and Its Effect on Dormant Virginia-type Seeds. Plant Physiol. 1969 Mar;44(3):326–330. doi: 10.1104/pp.44.3.326. [DOI] [PMC free article] [PubMed] [Google Scholar]
  5. Ketring D. L., Morgan P. W. Physiology of Oil Seeds: II. Dormancy Release in Virginia-type Peanut Seeds by Plant Growth Regulators. Plant Physiol. 1971 Apr;47(4):488–492. doi: 10.1104/pp.47.4.488. [DOI] [PMC free article] [PubMed] [Google Scholar]
  6. Khan A. A. Inhibition of Gibberellic Acid-induced Germination by Abscisic Acid and Reversal by Cytokinins. Plant Physiol. 1968 Sep;43(9):1463–1465. doi: 10.1104/pp.43.9.1463. [DOI] [PMC free article] [PubMed] [Google Scholar]
  7. Lau O. L., Yang S. F. Mechanism of a Synergistic Effect of Kinetin on Auxin-induced Ethylene Production: Suppression of Auxin Conjugation. Plant Physiol. 1973 Jun;51(6):1011–1014. doi: 10.1104/pp.51.6.1011. [DOI] [PMC free article] [PubMed] [Google Scholar]
  8. Marcus A. Seed germination and the capacity for protein synthesis. Symp Soc Exp Biol. 1969;23:143–160. [PubMed] [Google Scholar]
  9. Marei N., Romani R. Ethylene-stimulated Synthesis of Ribosomes, Ribonucleic Acid, and Protein in Developing Fig Fruits. Plant Physiol. 1971 Dec;48(6):806–808. doi: 10.1104/pp.48.6.806. [DOI] [PMC free article] [PubMed] [Google Scholar]

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

RESOURCES