Skip to main content
Plant Physiology logoLink to Plant Physiology
. 1966 Jun;41(6):962–964. doi: 10.1104/pp.41.6.962

Mediation of Phytochrome in the Inductive Action of Low Temperature on Dark Germination of Lettuce Seed at Supra-Optimal Temperature 1

Nurit Roth-Bejerano 1,2, D Koller 1,2, M Negbi 1,2
PMCID: PMC1086459  PMID: 16656362

Abstract

The induction of dark germination in light-requiring lettuce (Lactuca sativa) seed at supraoptimal temperatures by cold treatment (in darkness) was partly reversed by a brief far-red irradiation made at time of transfer, and even more so when the irradiation was made at the beginning of the cold pretreatment. When the inhibitory far-red irradiation was followed by additional cold treatment, the promotion was greatly restored. The promotive effects of brief irradiations with red light were further enhanced by a following cold period, before transfer to the supraoptimal temperature. These results are interpreted as indicating that the active (far-red absorbing) form of phytochrome is pre-existing in the dry seed, and interacts with a co-factor which is built-up during imbibition. The rate of build-up of this co-factor, as well as of the dark inactivation of active phytochrome increase with temperature. The products of the interaction pass through a photo-labile thermo-stable phase, before becoming photo-stable as well.

Full text

PDF
962

Selected References

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

  1. 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]
  2. Kahn A. An Analysis of "Dark-osmotic Inhibition" of Germination of Lettuce Seeds. Plant Physiol. 1960 Jan;35(1):1–7. doi: 10.1104/pp.35.1.1. [DOI] [PMC free article] [PubMed] [Google Scholar]
  3. Kahn A. Promotion of Lettuce Seed Germination by Gibberellin. Plant Physiol. 1960 May;35(3):333–339. doi: 10.1104/pp.35.3.333. [DOI] [PMC free article] [PubMed] [Google Scholar]

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

RESOURCES