Abstract
Increasing levels of CO(2) have been shown to stimulate the rate of photosynthesis, eliminate the oxygen inhibition of photosynthesis (Warburg effect), and decrease glycolate formation in isolated spinach chloroplasts. Ribose 5-phosphate and fructose 1,6-diphosphate at concentrations of 5 to 10 mum also stimulate the rate of plastid photosynthesis and eliminate the Warburg effect. In contrast to the effect of high CO(2) levels, these sugar phosphates have little effect on glycolate formation. Evidence is presented to show that the level of intermediates of the photosynthetic carbon reduction cycle may influence the Warburg effect in vivo. It is postulated that the formation of glycolate is not the causal factor of the Warburg effect.
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Claims 10
Claim · model-written summary
Increasing CO2 stimulated photosynthesis.
- Taxon
- Spinach
Spinacia oleraceat0 - Treatment
- Increasing levels of CO(2)e0
- Outcome
- rate of photosynthesise0
- Direction
- stimulatee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing levels of CO(2) have been shown to stimulate the rate of photosynthesis”
t0“Spinach Chloroplasts”
Claim · model-written summary
Increasing CO2 eliminated oxygen inhibition of photosynthesis.
- Taxon
- SpinachSpinacia oleraceat0
- Treatment
- Increasing levels of CO(2)e0
- Outcome
- oxygen inhibition of photosynthesis (Warburg effect)e0
- Direction
- eliminatee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing levels of CO(2) have been shown to stimulate the rate of photosynthesis, eliminate the oxygen inhibition of photosynthesis (Warburg effect)”
t0“Spinach Chloroplasts”
Claim · model-written summary
Increasing CO2 decreased glycolate formation.
- Taxon
- spinachSpinacia oleraceae0
- Treatment
- Increasing levels of CO(2)e0
- Outcome
- glycolate formatione0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing levels of CO(2) have been shown to stimulate the rate of photosynthesis, eliminate the oxygen inhibition of photosynthesis (Warburg effect), and decrease glycolate formation in isolated spinach chloroplasts.”
Claim · model-written summary
Ribose 5-phosphate stimulated plastid photosynthesis.
- Taxon
- SpinachSpinacia oleraceat0
- Treatment
- Ribose 5-phosphatee0
- Outcome
- rate of plastid photosynthesise0
- Direction
- stimulatee0
- Qualifier
- 5 to 10 mume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ribose 5-phosphate and fructose 1,6-diphosphate at concentrations of 5 to 10 mum also stimulate the rate of plastid photosynthesis”
t0“Spinach Chloroplasts”
Claim · model-written summary
Fructose 1,6-diphosphate stimulated plastid photosynthesis.
- Taxon
- SpinachSpinacia oleraceat0
- Treatment
- fructose 1,6-diphosphatee0
- Outcome
- rate of plastid photosynthesise0
- Direction
- stimulatee0
- Qualifier
- 5 to 10 mume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ribose 5-phosphate and fructose 1,6-diphosphate at concentrations of 5 to 10 mum also stimulate the rate of plastid photosynthesis”
t0“Spinach Chloroplasts”
Claim · model-written summary
Ribose 5-phosphate eliminated the Warburg effect.
- Taxon
- SpinachSpinacia oleraceat0
- Treatment
- Ribose 5-phosphatee0
- Outcome
- Warburg effecte0
- Direction
- eliminatee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ribose 5-phosphate and fructose 1,6-diphosphate at concentrations of 5 to 10 mum also stimulate the rate of plastid photosynthesis and eliminate the Warburg effect.”
t0“Spinach Chloroplasts”
Claim · model-written summary
Fructose 1,6-diphosphate eliminated the Warburg effect.
- Taxon
- SpinachSpinacia oleraceat0
- Treatment
- fructose 1,6-diphosphatee0
- Outcome
- Warburg effecte0
- Direction
- eliminatee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ribose 5-phosphate and fructose 1,6-diphosphate at concentrations of 5 to 10 mum also stimulate the rate of plastid photosynthesis and eliminate the Warburg effect.”
t0“Spinach Chloroplasts”
Claim · model-written summary
The sugar phosphates had little effect on glycolate formation.
- Taxon
- SpinachSpinacia oleraceat0
- Treatment
- these sugar phosphatese0
- Outcome
- glycolate formatione0
- Direction
- little effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“these sugar phosphates have little effect on glycolate formation.”
t0“Spinach Chloroplasts”
Claim · model-written summary
The authors propose that photosynthetic carbon reduction intermediates influence the Warburg effect in vivo.
- Taxon
- SpinachSpinacia oleraceat0
- Outcome
- Warburg effecte0
- Qualifier
- level of intermediates of the photosynthetic carbon reduction cyclee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the level of intermediates of the photosynthetic carbon reduction cycle may influence the Warburg effect in vivo.”
t0“Spinach Chloroplasts”
Claim · model-written summary
The authors postulate that glycolate formation is not the cause of the Warburg effect.
- Taxon
- SpinachSpinacia oleraceat0
- Outcome
- Warburg effecte0
- Qualifier
- formation of glycolatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the formation of glycolate is not the causal factor of the Warburg effect.”
t0“Spinach Chloroplasts”
The same questions in other papers
fructose · physiology: photosynthesis · Spinacia oleracea (spinach)Results agree
2 papers in the same direction as this paper
- positive
- positive
co2 · physiology: photosynthesis · Spinacia oleracea (spinach)Results agree
5 papers in the same direction as this paper
- positive
- positive
- positive
2 papers more in this group
See all 6 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.