Abstract
A previously described photoresponse of lettuce seed germination to red and far-red light is shown to be paralleled by a response of phosphate metabolic activity: (1) When seeds were continuously irradiated, red light accelerated and far-red suppressed their phosphate uptake and esterification. (2) The influence of monochromatic light on phosphate metabolism of seeds, determined after 36 and 64 hours of germination, respectively, indicated maximum potentiation between 550 and 650 mμ, maximum suppression beyond 700 mμ, and partial suppression at 475 mμ. Stimulation was encountered at 400 mμ, but with shorter wavelengths of the ultraviolet spectrum, suppression appeared again. (3) Photoactivation of phosphate metabolism in response to each of the three loci (550, 600, and 650 mμ, i.e., green, orange, and red light, respectively) of the potentiating spectral band was reversed by far-red (750 mμ) light. These activations and inhibitions could be reversed several times in an alternating sequence. Complete reversibility depended entirely upon the magnitudes of the radiant flux for the two counteracting wavelengths, and this was characteristic for each pair of antagonistic wavelengths. In view of the association of phytochrome with the isolated mitochondria and of the specific manner in which their phosphorylation activity is influenced by light, it is suggested that a part of the energy flow required for cellular development may be channeled through the mitochondrial–phytochrome system.
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Claims 11
Claim · model-written summary
Continuous red light accelerated lettuce seed phosphate uptake and esterification.
- Taxon
- LETTUCE
Lactuca sativat0 - Organ / stage
- seedse0
- Treatment
- red lighte0
- Outcome
- phosphate uptake and esterificatione0
- Direction
- acceleratede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When seeds were continuously irradiated, red light accelerated and far-red suppressed their phosphate uptake and esterification.”
t0“LETTUCE”
Claim · model-written summary
Continuous far-red light suppressed lettuce seed phosphate uptake and esterification.
- Taxon
- LETTUCELactuca sativat0
- Organ / stage
- seedse0
- Treatment
- far-rede0
- Outcome
- phosphate uptake and esterificatione0
- Direction
- suppressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When seeds were continuously irradiated, red light accelerated and far-red suppressed their phosphate uptake and esterification.”
t0“LETTUCE”
Claim · model-written summary
Light at 550–650 mμ maximally potentiated seed phosphate metabolism.
- Taxon
- LETTUCELactuca sativat0
- Treatment
- between 550 and 650 mμe0
- Outcome
- potentiatione0
- Direction
- maximume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maximum potentiation between 550 and 650 mμ”
t0“LETTUCE”
Claim · model-written summary
Light beyond 700 mμ maximally suppressed seed phosphate metabolism.
- Taxon
- LETTUCELactuca sativat0
- Treatment
- beyond 700 mμe0
- Outcome
- suppressione0
- Direction
- maximume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maximum suppression beyond 700 mμ”
t0“LETTUCE”
Claim · model-written summary
Light at 475 mμ partially suppressed seed phosphate metabolism.
- Taxon
- LETTUCELactuca sativat0
- Treatment
- 475 mμe0
- Outcome
- suppressione0
- Direction
- partiale0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“partial suppression at 475 mμ”
t0“LETTUCE”
Claim · model-written summary
Light at 400 mμ stimulated seed phosphate metabolism.
- Taxon
- LETTUCELactuca sativat0
- Treatment
- 400 mμe0
- Outcome
- Stimulatione0
- Direction
- Stimulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stimulation was encountered at 400 mμ”
t0“LETTUCE”
Claim · model-written summary
Shorter ultraviolet wavelengths suppressed seed phosphate metabolism.
- Taxon
- LETTUCELactuca sativat0
- Treatment
- shorter wavelengths of the ultraviolet spectrume0
- Outcome
- suppressione0
- Direction
- suppressione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with shorter wavelengths of the ultraviolet spectrum, suppression appeared again”
t0“LETTUCE”
Claim · model-written summary
Far-red 750 mμ light reversed photoactivation at 550, 600, and 650 mμ.
- Taxon
- LETTUCELactuca sativat0
- Treatment
- far-red (750 mμ) lighte0
- Outcome
- Photoactivation of phosphate metabolisme0
- Direction
- reversede0
- Comparator
- three loci (550, 600, and 650 mμ, i.e., green, orange, and red light, respectively)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Photoactivation of phosphate metabolism in response to each of the three loci (550, 600, and 650 mμ, i.e., green, orange, and red light, respectively) of the potentiating spectral band was reversed by far-red (750 mμ) light.”
t0“LETTUCE”
Claim · model-written summary
The activation and inhibition responses could be reversed repeatedly in alternating sequence.
- Taxon
- LETTUCELactuca sativat0
- Outcome
- activations and inhibitionse0
- Direction
- reversede0
- Qualifier
- several times in an alternating sequencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These activations and inhibitions could be reversed several times in an alternating sequence.”
t0“LETTUCE”
Claim · model-written summary
Complete reversibility depended on the radiant flux of the opposing wavelengths.
- Taxon
- LETTUCELactuca sativat0
- Outcome
- Complete reversibilitye0
- Qualifier
- magnitudes of the radiant flux for the two counteracting wavelengthse0
Not reportedTreatmentDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Complete reversibility depended entirely upon the magnitudes of the radiant flux for the two counteracting wavelengths, and this was characteristic for each pair of antagonistic wavelengths.”
t0“LETTUCE”
Claim · model-written summary
The authors suggest that energy for cellular development may pass through a mitochondrial–phytochrome system.
- Taxon
- LETTUCELactuca sativat0
- Outcome
- energy flow required for cellular developmente0
- Qualifier
- mitochondrial–phytochrome systeme0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it is suggested that a part of the energy flow required for cellular development may be channeled through the mitochondrial–phytochrome system.”
t0“LETTUCE”
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See all 52 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.