LETTUCE SEED GERMINATION: EFFECTS OF HIGH TEMPERATURE AND OF REPEATED FAR‐RED TREATMENT IN RELATION TO PHYTOCHROME

@article{Scheibe1969LETTUCESG,
  title={LETTUCE SEED GERMINATION: EFFECTS OF HIGH TEMPERATURE AND OF REPEATED FAR‐RED TREATMENT IN RELATION TO PHYTOCHROME},
  author={Joseph Scheibe and Anton Lang},
  journal={Photochemistry and Photobiology},
  year={1969},
  volume={9}
}
  • J. Scheibe, A. Lang
  • Published 1 February 1969
  • Environmental Science
  • Photochemistry and Photobiology
Abstract— At 37°C the active form of phytochrome in lettuce seed cannot function to promote subsequent germination. This effect of high temperature is distinct from thermal acceleration of dark reversion from the active form of phytochrome to the inactive form, and may be due to reversible denaturation of phytochrome. 
Effect of light and temperature on the germination of lettuce seeds
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It is suggested that high temperature acts by decreasing the threshold of the active, far-red absorbing, form of phytochrome (Pfr) needed to promote germination.
Phytochrome transformation in lettuce seed irradiated at various temperatures.
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Using a 2-h irradiation period at constant quantum irradiance, a complete action spectrum for inhibition of germination of lettuce seed has been obtained and it was shown that phytochrome potentiation of Germination is maximal at all wavelengths below 700 nm, including the highly active blue region.
THE TEMPERATURE DEPENDENCE OF Pfr ACTION GOVERNS THE UPPER TEMPERATURE LIMIT FOR GERMINATION IN LETTUCE
TLDR
It is concluded that factors that alter the upper temperature limit for germination do so by changing the temperature dependence of phytochrome action.
Influence of Ageing on Photo-and Thermo-Control of Seed Germination in Grand Rapids Lettuce (Lactuca sativa L.)
TLDR
Germination induction effects in the heat-sensitized seeds with high temperature pretreatment after the onset of imbibition are greater in GA3 than in R light, and photoreversible induction by the prolonged exposure to FR light is due to the secondary photo-dormant stage of the seeds.
Germinação de sementes de alface sob altas temperaturas
High temperature during imbibition of lettuce seeds can inhibit germination. Several methods to circumvent thermoinhibition and, or thermodormancy have been proposed including resistant germplasm,
The Viability of Germination in Eggplant (Solanum melongena L.) Seeds Pretreated by Dark (D) and Far-Red Light (FR) at Low (25°C) or High (35°C) Temperature
TLDR
The viability of eggplant seeds is controlled by D and FR at low (25°C) or high temperature pretreatments after the onset of imbibition, but those pretreated by D at 25°C are led to the deterioration in the viability of germination.
Phytochromes in Agrobacterium fabrum
The focus of this review is on the phytochromes Agp1 and Agp2 of Agrobacterium fabrum. These are involved in regulation of conjugation, gene transfer into plants, and other effects. Since crystal
Interaction of carbon dioxide and ethylene in overcoming thermodormancy of lettuce seeds.
The combination of ethylene with CO(2) will completely overcome the thermodormancy of lettuce (Lactuca sativa L.) seeds at 35 C. This combination is effective if it is added to seeds either at the
Temperature Effects on Agrobacterium Phytochrome Agp1
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The temperature-dependent kinase activity and spectral properties in the physiological temperature range suggest that Agp1 serves as an integrated light and temperature sensor in A. tumefaciens.
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TLDR
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.
Photosensitive Site in Lettuce Seeds
TLDR
It is concluded that the photoreceptor is probably located in the tip of the hypocotyl of Grand Rapids lettuce seeds, and that far-red light is effective only in inhibiting it.
Photocontrol of Plant Development by the Simultaneous Excitations of Two Interconvertible Pigments. III. Control of Seed Germination and Axis Elongation
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Action spectra measured for seed germination and radicle elongation in Nemophila insignis and Lactuca sativa var.
A GENERAL HYPOTHESIS TO INTERPRET ‘HIGH ENERGY PHENOMENA’ OF PHOTOMORPHOGENESIS ON THE BASIS OF PHYTOCHROME
Abstract— It is demonstrated that the high energy reaction of photomorphogenesis (blue‐far‐red reaction) in the case of seed germination and hypocotyl lengthening of Lactuca sativa (L.) ‘Grand
Lettuce Seed Germination: Evidence for a Reversible Light-Induced Increase in Growth Potential and for Phytochrome Mediation of the Low Temperature Effect.
TLDR
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Action of Light on Lettuce-Seed Germination
TLDR
The observations of Flint and McAlister that imbibed seed of some lettuce varieties can be promoted in germination by irradiation in the red portion of the spectrum and inhibited in the infrared were verified and the action spectrum for lettuce-seed germination is the same as that effective for photoperiodic control of floral initiation.
Interaction of Temperature and Light in Germination of Seeds.
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A Reversible Photoreaction Controlling Seed Germination.
* Part of this work was done as a National Research Council Fellow at the University of California, Berkeley. 1 Bonner, J. T., Am. J. Bot., 31, 175 (1944). 2 Skupienski, F. X., Recherches Sur Le
Promotion of Lettuce Seed Germination by Gibberellin.
  • A. Kahn
  • Biology, Medicine
    Plant physiology
  • 1960
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