Skip to main content
NCBI home page
Plant Physiology logoLink to Plant Physiology
. 1977 Feb;59(2):244–249. doi: 10.1104/pp.59.2.244

Model for Variable Light Sensitivity in Imbibed Dark-Dormant Seeds

Stephen O Duke a,1, Grant H Egley a, Bonnie J Reger a,2
PMCID: PMC542374  PMID: 16659826

Abstract

The level of light-induced germination of the seed of common purslane (Portulaca oleracea L.) and curly dock (Rumex crispus L.) changes with dark incubation time prior to brief, low energy, red light treatment. The rate at which phytochrome—far red-absorbing form (Pfr) acts in the light-induced population of seeds was measured by quantitating per cent reversals of the red light effect with saturating far red light exposures at successive times after the red light exposure. A linear positive correlation was found between this rate and the final germination level. These results are compatible with a model involving changing levels, during dark incubation, of a component with which Pfr interacts. In this model, germination is initiated after attainment of a certain level of interaction between Pfr and this component. These findings also support the view that the Pfr to Pr decay rate constant and total phytochrome level are stable during dark incubation.

Full text

PDF
244

Selected References

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

  1. Hsiao A. I., Vidaver W. Dark Reversion of Phytochrome in Lettuce Seeds Stored in a Water-saturated Atmosphere. Plant Physiol. 1973 Mar;51(3):459–463. doi: 10.1104/pp.51.3.459. [DOI] [PMC free article] [PubMed] [Google Scholar]
  2. Ikuma H., Thimann K. V. Analysis of Germination Processes of Lettuce Seed by Means of Temperature and Anaerobiosis. Plant Physiol. 1964 Sep;39(5):756–767. doi: 10.1104/pp.39.5.756. [DOI] [PMC free article] [PubMed] [Google Scholar]
  3. Loercher L. Persistence of red light induction in lettuce seeds of varying hydration. Plant Physiol. 1974 Mar;53(3):503–506. doi: 10.1104/pp.53.3.503. [DOI] [PMC free article] [PubMed] [Google Scholar]
  4. Negbi M., Black M., Bewley J. D. Far-red Sensitive Dark Processes Essential for Light- and Gibberellin-induced Germination of Lettuce Seed. Plant Physiol. 1968 Jan;43(1):35–40. doi: 10.1104/pp.43.1.35. [DOI] [PMC free article] [PubMed] [Google Scholar]
  5. Speer H. L., Hsiao A. I., Vidaver W. Effects of Germination-promoting Substances Given in Conjunction with Red Light on the Phytochrome-mediated Germination of Dormant Lettuce Seeds (Lactuca sativa L.). Plant Physiol. 1974 Dec;54(6):852–854. doi: 10.1104/pp.54.6.852. [DOI] [PMC free article] [PubMed] [Google Scholar]
  6. Taylorson R. B., Hendricks S. B. Action of Phytochrome During Prechilling of Amaranthus retroflexus L. Seeds. Plant Physiol. 1969 Jun;44(6):821–825. doi: 10.1104/pp.44.6.821. [DOI] [PMC free article] [PubMed] [Google Scholar]
  7. Taylorson R. B., Hendricks S. B. Changes in Phytochrome Expressed by Germination of Amaranthus retroflexus L. Seeds. Plant Physiol. 1971 May;47(5):619–622. doi: 10.1104/pp.47.5.619. [DOI] [PMC free article] [PubMed] [Google Scholar]
  8. Taylorson R. B., Hendricks S. B. Phytochrome Control of Germination of Rumex crispus L. Seeds Induced by Temperature Shifts. Plant Physiol. 1972 Dec;50(6):645–648. doi: 10.1104/pp.50.6.645. [DOI] [PMC free article] [PubMed] [Google Scholar]
  9. Taylorson R. B., Hendricks S. B. Phytochrome Transformation and Action in Seeds of Rumex crispus L. during Secondary Dormancy. Plant Physiol. 1973 Nov;52(5):475–479. doi: 10.1104/pp.52.5.475. [DOI] [PMC free article] [PubMed] [Google Scholar]
  10. Taylorson R. B., Hendricks S. B. Rehydration of Phytochrome in Imbibing Seeds of Amaranthus retroflexus L. Plant Physiol. 1972 Apr;49(4):663–665. doi: 10.1104/pp.49.4.663. [DOI] [PMC free article] [PubMed] [Google Scholar]
  11. Vidaver W., Hsiao A. I. Actions of gibberellic Acid and phytochrome on the germination of grand rapids lettuce seeds. Plant Physiol. 1974 Feb;53(2):266–268. doi: 10.1104/pp.53.2.266. [DOI] [PMC free article] [PubMed] [Google Scholar]

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

RESOURCES