Abstract
Lycopersicon esculentum Mill. cv Vedettos and Lycopersicon chmielewskii Rick, LA 1028, were exposed to two CO(2) concentrations (330 or 900 microliters per liter) for 10 weeks. Tomato plants grown at 900 microliters per liter contained more starch and more sugars than the control. However, we found no significant accumulation of starch and sugars in the young leaves of L. esculentum exposed to high CO(2). Carbon exchange rates were significantly higher in CO(2)-enriched plants for the first few weeks of treatment but thereafter decreased as tomato plants acclimated to high atmospheric CO(2). This indicates that the long-term decline of photosynthetic efficiency of leaf 5 cannot be attributed to an accumulation of sugar and/or starch. The average concentration of starch in leaves 5 and 9 was always higher in L. esculentum than in L. chmielewskii (151.7% higher). A higher proportion of photosynthates was directed into starch for L. esculentum than for L. chmielewskii. However, these characteristics did not improve the long-term photosynthetic efficiency of L. chmielewskii grown at high CO(2) when compared with L. esculentum. The chloroplasts of tomato plants exposed to the higher CO(2) concentration exhibited a marked accumulation of starch. The results reported here suggest that starch and/or sugar accumulation under high CO(2) cannot entirely explain the loss of photosynthetic efficiency of high CO(2)-grown plants.
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Claims 9
Claim · model-written summary
Elevated CO2 increased starch and sugars in tomato plants.
- Taxon
- Tomato
Solanum lycopersicume0 - Treatment
- 900 microliters per litere0
- Outcome
- starch and more sugarse0
- Direction
- moree0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato plants grown at 900 microliters per liter contained more starch and more sugars than the control.”
Claim · model-written summary
Young L. esculentum leaves did not significantly accumulate starch or sugars under high CO2.
- Taxon
- L. esculentumSolanum lycopersicume0
- Organ / stage
- young leavese0
- Treatment
- high CO(2)e0
- Outcome
- starch and sugarse0
- Direction
- no significant accumulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“we found no significant accumulation of starch and sugars in the young leaves of L. esculentum exposed to high CO(2)”
Claim · model-written summary
Carbon exchange rates initially increased in CO2-enriched tomato.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- CO(2)-enrichede0
- Outcome
- Carbon exchange ratese0
- Direction
- highere0
- Qualifier
- first few weeks of treatmente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Carbon exchange rates were significantly higher in CO(2)-enriched plants for the first few weeks of treatment”
t0“Tomato”
Claim · model-written summary
Carbon exchange rates subsequently declined during acclimation.
- Taxon
- tomatoSolanum lycopersicume0
- Outcome
- Carbon exchange ratese0
- Direction
- decreasede0
- Qualifier
- high atmospheric CO(2)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Carbon exchange rates were significantly higher in CO(2)-enriched plants for the first few weeks of treatment but thereafter decreased as tomato plants acclimated to high atmospheric CO(2)”
Claim · model-written summary
Leaf starch concentration was 151.7% higher in L. esculentum than L. chmielewskii.
- Taxon
- L. esculentumSolanum lycopersicume0
- Organ / stage
- leaves 5 and 9e0
- Outcome
- concentration of starche0
- Direction
- highere0
- Value
- 151.7%e0
- Comparator
- L. chmielewskiie0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The average concentration of starch in leaves 5 and 9 was always higher in L. esculentum than in L. chmielewskii (151.7% higher).”
Claim · model-written summary
L. esculentum directed a higher proportion of photosynthates into starch than L. chmielewskii.
- Taxon
- L. esculentumSolanum lycopersicume0
- Outcome
- proportion of photosynthates was directed into starche0
- Direction
- highere0
- Comparator
- L. chmielewskiie0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A higher proportion of photosynthates was directed into starch for L. esculentum than for L. chmielewskii.”
Claim · model-written summary
These carbohydrate allocation characteristics did not improve long-term photosynthetic efficiency of L. chmielewskii compared with L. esculentum.
Verbatim
e0“these characteristics did not improve the long-term photosynthetic efficiency of L. chmielewskii grown at high CO(2) when compared with L. esculentum”
Claim · model-written summary
Chloroplasts of plants exposed to higher CO2 accumulated starch markedly.
- Taxon
- tomatoSolanum lycopersicume0
- Organ / stage
- chloroplastse0
- Treatment
- higher CO(2) concentratione0
- Outcome
- accumulation of starche0
- Direction
- accumulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The chloroplasts of tomato plants exposed to the higher CO(2) concentration exhibited a marked accumulation of starch.”
Claim · model-written summary
Sugar or starch accumulation cannot entirely explain photosynthetic efficiency loss under high CO2.
- Taxon
- TomatoSolanum lycopersicumt0
- Outcome
- loss of photosynthetic efficiencye0
- Qualifier
- starch and/or sugar accumulation under high CO(2)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“starch and/or sugar accumulation under high CO(2) cannot entirely explain the loss of photosynthetic efficiency of high CO(2)-grown plants”
t0“Tomato”
The same questions in other papers
co2 · quality: sugar starch · Solanum lycopersicum (tomato)Results differ
7 papers in the same direction as this paper · 4 in the opposite direction
- positive
- no effect
- no effect
8 papers more in this group
See all 12 papers →co2 · molecular: metabolites · Solanum lycopersicum (tomato)Positive and negative results
18 papers in the same direction as this paper · 13 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- no effect
- no effect
29 papers more in this group
See all 33 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.