Abstract
Leaf discs of Phaseolus vulgaris L. were exposed to 14 CO 2 in light, and transient changes in the radioactivity of photosynthetic intermediates were determined when illumination was interrupted or the CO 2 concentration lowered. The responses of phosphoglyceric acid, hexose monophosphate, and ribulose diphosphate showed that the Calvin cycle operates in this tissue. Turning off the light caused a rapid drop in 14 C-sucrose and in the total 14 C-content of the tissue, with a simultaneous rise in radioactive alanine, glutamate, malate, and aspartate, suggesting the rapid entry of sucrose carbon into respiratory pathways. Lowering the CO 2 concentration resulted in a transient rise in 14 C-glycolate which was followed by a temporary increase in 14 C-serine-glycine and in the ambient CO 2 concentration. This supports the hypothesis that glycolate produced in photosynthesis is a substrate for glycine and serine synthesis as well as for CO 2 evolution.
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Claims 7
Claim · model-written summary
Intermediate responses indicate that the Calvin cycle operates in leaf discs.
- Taxon
- Phaseolus vulgaris
Phaseolus vulgarist0 - Outcome
- Calvin cycle operates in this tissuee0
- Qualifier
- responses of phosphoglyceric acid, hexose monophosphate, and ribulose diphosphatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The responses of phosphoglyceric acid, hexose monophosphate, and ribulose diphosphate showed that the Calvin cycle operates in this tissue.”
t0“Phaseolus vulgaris”
Claim · model-written summary
Turning off light rapidly decreased radiolabeled sucrose and total tissue radiocarbon.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Treatment
- Turning off the lighte0
- Outcome
- 14 C-sucrose and in the total 14 C-content of the tissuee0
- Direction
- drope0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Turning off the light caused a rapid drop in 14 C-sucrose and in the total 14 C-content of the tissue”
t0“Phaseolus vulgaris”
Claim · model-written summary
Turning off light raised radioactive alanine, glutamate, malate and aspartate.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Treatment
- Turning off the lighte1
- Outcome
- radioactive alanine, glutamate, malate, and aspartatee0
- Direction
- risee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with a simultaneous rise in radioactive alanine, glutamate, malate, and aspartate”
e1“Turning off the light caused a rapid drop”
t0“Phaseolus vulgaris”
Claim · model-written summary
The authors infer rapid entry of sucrose carbon into respiratory pathways.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Outcome
- entry of sucrose carbon into respiratory pathwayse0
- Qualifier
- rapide0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“suggesting the rapid entry of sucrose carbon into respiratory pathways”
t0“Phaseolus vulgaris”
Claim · model-written summary
Lower CO2 caused a transient rise in radiolabeled glycolate.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Treatment
- Lowering the CO 2 concentratione0
- Outcome
- 14 C-glycolatee0
- Direction
- risee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lowering the CO 2 concentration resulted in a transient rise in 14 C-glycolate”
t0“Phaseolus vulgaris”
Claim · model-written summary
Lower CO2 temporarily raised radiolabeled serine-glycine and ambient CO2.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Treatment
- Lowering the CO 2 concentratione1
- Outcome
- 14 C-serine-glycine and in the ambient CO 2 concentratione0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“which was followed by a temporary increase in 14 C-serine-glycine and in the ambient CO 2 concentration”
e1“Lowering the CO 2 concentration resulted”
t0“Phaseolus vulgaris”
Claim · model-written summary
The data support glycolate as a substrate for glycine and serine synthesis and CO2 evolution.
- Taxon
- Phaseolus vulgarisPhaseolus vulgarist0
- Compound
- glycolatee0
- Outcome
- glycine and serine synthesis as well as for CO 2 evolutione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“glycolate produced in photosynthesis is a substrate for glycine and serine synthesis as well as for CO 2 evolution”
t0“Phaseolus vulgaris”
The same questions in other papers
light · molecular: metabolites · Phaseolus vulgaris (common bean)Positive and negative results
3 papers in the same direction as this paper · 11 in the opposite direction
- positive
- positive
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See all 15 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.