Abstract
When dark-grown cucumber (Cucumis sativus L.) seedlings previously exposed to white light for 20 hours were returned to darkness, the ability of isolated chloroplasts to synthesize 5-aminolevulinic acid dropped by approximately 70% within 1 hour. The seedlings were then exposed to light, and the synthetic ability of the isolated chloroplasts was determined. Restoration of the synthetic capacity was promoted by continuous white or red light of moderate intensity. Intermittent red light was also effective. Blue and far-red light did not restore the synthetic capability. Blue light given after a red pulse did not enhance the effect of the red light. Far-red light given immediately after each red pulse prevented the stimulation due to intermittent red light. Restoration of the biosynthetic activity by in vivo light treatments was inhibited by cycloheximide indicating the requirement for translation on 80 S ribosomes for the in vivo light response. These findings suggest that the majority of the plastidic 5-aminolevulinic acid synthesis is under phytochrome regulation.
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Claims 9
Claim · model-written summary
When dark-grown cucumber seedlings previously exposed to white light for 20 hours were returned to darkness, the ALA-synthesizing ability of isolated chloroplasts dropped by approximately 70% within 1 hour.
- Taxon
- cucumber
Cucumis sativuse0 - Organ / stage
- isolated chloroplastse1
- Treatment
- returned to darknesse1
- Outcome
- ability of isolated chloroplasts to synthesize 5-aminolevulinic acide1
- Direction
- droppede1
- Value
- approximately 70%e1
- Comparator
- seedlings previously exposed to white light for 20 hourse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber (Cucumis sativus L.)”
e1“seedlings previously exposed to white light for 20 hours were returned to darkness, the ability of isolated chloroplasts to synthesize 5-aminolevulinic acid dropped by approximately 70% within 1 hour”
Claim · model-written summary
Continuous white or red light of moderate intensity promoted restoration of the synthetic capacity for ALA in cucumber.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- continuous white or red light of moderate intensitye1
- Outcome
- Restoration of the synthetic capacitye1
- Direction
- promotede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber (Cucumis sativus L.)”
e1“Restoration of the synthetic capacity was promoted by continuous white or red light of moderate intensity”
Claim · model-written summary
Intermittent red light was also effective in restoring the synthetic capacity in cucumber.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- Intermittent red lighte1
- Outcome
- effectivee1
- Direction
- effectivee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber (Cucumis sativus L.)”
e1“Intermittent red light was also effective”
Claim · model-written summary
Blue light did not restore the synthetic capability.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- Bluee1
- Outcome
- synthetic capabilitye1
- Direction
- did not restoree1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber (Cucumis sativus L.)”
e1“Blue and far-red light did not restore the synthetic capability”
Claim · model-written summary
Far-red light did not restore the synthetic capability.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- far-red lighte1
- Outcome
- synthetic capabilitye1
- Direction
- did not restoree1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber (Cucumis sativus L.)”
e1“Blue and far-red light did not restore the synthetic capability”
Claim · model-written summary
Blue light given after a red pulse did not enhance the effect of the red light.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- Blue light given after a red pulsee1
- Outcome
- the effect of the red lighte1
- Direction
- did not enhancee1
- Comparator
- the red lighte1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber (Cucumis sativus L.)”
e1“Blue light given after a red pulse did not enhance the effect of the red light”
Claim · model-written summary
Far-red light given immediately after each red pulse prevented the stimulation due to intermittent red light.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- Far-red light given immediately after each red pulsee1
- Outcome
- the stimulation due to intermittent red lighte1
- Direction
- preventede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber (Cucumis sativus L.)”
e1“Far-red light given immediately after each red pulse prevented the stimulation due to intermittent red light”
Claim · model-written summary
Restoration of biosynthetic activity by in vivo light treatments was inhibited by cycloheximide.
- Taxon
- cucumberCucumis sativuse0
- Treatment
- cycloheximidee1
- Outcome
- Restoration of the biosynthetic activitye1
- Direction
- inhibitede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber (Cucumis sativus L.)”
e1“Restoration of the biosynthetic activity by in vivo light treatments was inhibited by cycloheximide”
Claim · model-written summary
The authors suggest that the majority of plastidic ALA synthesis is under phytochrome regulation.
- Taxon
- cucumberCucumis sativuse0
- Gene
- phytochromee1
- Outcome
- plastidic 5-aminolevulinic acid synthesise1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cucumber (Cucumis sativus L.)”
e1“the majority of the plastidic 5-aminolevulinic acid synthesis is under phytochrome regulation”
The same questions in other papers
light · molecular: metabolites · Cucumis sativus (cucumber)Positive and negative results
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19 papers more in this group
See all 23 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.