Abstract
Carbon dioxide concentration (CO 2 ) and light intensity are known to play important roles in plant growth and carbon assimilation. Nevertheless, the underlying physiological mechanisms have not yet been fully explored. Tomato seedlings ( Solanum lycopersicum Mill. cv. Jingpeng No. 1) were exposed to two levels of CO 2 and three levels of light intensity and the effects on growth, leaf gas exchange and water use efficiency were investigated. Elevated CO 2 and increased light intensity promoted growth, dry matter accumulation and pigment concentration and together the seedling health index. Elevated CO 2 had no significant effect on leaf nitrogen content but did significantly upregulate Calvin cycle enzyme activity. Increased CO 2 and light intensity promoted photosynthesis, both on a leaf‐area basis and on a chlorophyll basis. Increased CO 2 also increased light‐saturated maximum photosynthetic rate, apparent quantum efficiency and carboxylation efficiency and, together with increased light intensity, it raised photosynthetic capacity. However, increased CO 2 reduced transpiration and water consumption across different levels of light intensity, thus significantly increasing both leaf‐level and plant‐level water use efficiency. Among the range of treatments imposed, the combination of increased CO 2 (800 µmol CO 2 mol −1 ) and high light intensity (400 µmol m −2 s −1 ) resulted in optimal growth and carbon assimilation. We conclude that the combination of increased CO 2 and increased light intensity worked synergistically to promote growth, photosynthetic capacity and water use efficiency by upregulation of pigment concentration, Calvin cycle enzyme activity, light energy use and CO 2 fixation. Increased CO 2 also lowered transpiration and hence water usage.
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Claims 11
Claim · model-written summary
Elevated carbon dioxide promoted tomato growth, dry matter accumulation, pigment concentration and seedling health index.
- Taxon
- Tomato seedlings
Solanum lycopersicume0 - Material
- Jingpeng No. 1e0
- Treatment
- Elevated CO 2e1
- Outcome
- growth, dry matter accumulation and pigment concentratione1
- Direction
- promotede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato seedlings ( Solanum lycopersicum Mill. cv. Jingpeng No. 1)”
e1“Elevated CO 2 and increased light intensity promoted growth, dry matter accumulation and pigment concentration and together the seedling health index.”
Claim · model-written summary
Increased light intensity promoted tomato growth, dry matter accumulation and pigment concentration.
- Taxon
- Tomato seedlingsSolanum lycopersicume0
- Treatment
- increased light intensitye1
- Outcome
- growth, dry matter accumulation and pigment concentratione1
- Direction
- promotede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato seedlings ( Solanum lycopersicum Mill. cv. Jingpeng No. 1)”
e1“Elevated CO 2 and increased light intensity promoted growth, dry matter accumulation and pigment concentration and together the seedling health index.”
Claim · model-written summary
Elevated carbon dioxide had no significant effect on tomato leaf nitrogen content.
- Taxon
- Tomato seedlingsSolanum lycopersicume0
- Treatment
- Elevated CO 2e1
- Outcome
- leaf nitrogen contente1
- Direction
- no significant effecte1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato seedlings”
e1“Elevated CO 2 had no significant effect on leaf nitrogen content but did significantly upregulate Calvin cycle enzyme activity.”
Claim · model-written summary
Elevated carbon dioxide significantly increased tomato Calvin cycle enzyme activity.
- Taxon
- Tomato seedlingsSolanum lycopersicume0
- Treatment
- Elevated CO 2e1
- Outcome
- Calvin cycle enzyme activitye1
- Direction
- upregulatee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato seedlings”
e1“Elevated CO 2 had no significant effect on leaf nitrogen content but did significantly upregulate Calvin cycle enzyme activity.”
Claim · model-written summary
Increased carbon dioxide promoted tomato photosynthesis on both leaf area and chlorophyll bases.
- Taxon
- Tomato seedlingsSolanum lycopersicume0
- Treatment
- Increased CO 2e1
- Outcome
- photosynthesis, both on a leaf‐area basis and on a chlorophyll basise1
- Direction
- promotede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato seedlings”
e1“Increased CO 2 and light intensity promoted photosynthesis, both on a leaf‐area basis and on a chlorophyll basis.”
Claim · model-written summary
Increased light intensity promoted tomato photosynthesis on both leaf area and chlorophyll bases.
- Taxon
- Tomato seedlingsSolanum lycopersicume0
- Treatment
- light intensitye1
- Outcome
- photosynthesis, both on a leaf‐area basis and on a chlorophyll basise1
- Direction
- promotede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato seedlings”
e1“Increased CO 2 and light intensity promoted photosynthesis, both on a leaf‐area basis and on a chlorophyll basis.”
Claim · model-written summary
Increased carbon dioxide raised maximum photosynthetic rate, apparent quantum efficiency and carboxylation efficiency.
- Taxon
- Tomato seedlingsSolanum lycopersicume0
- Treatment
- Increased CO 2e1
- Outcome
- light‐saturated maximum photosynthetic rate, apparent quantum efficiency and carboxylation efficiencye1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato seedlings”
e1“Increased CO 2 also increased light‐saturated maximum photosynthetic rate, apparent quantum efficiency and carboxylation efficiency”
Claim · model-written summary
Higher carbon dioxide and light intensity raised tomato photosynthetic capacity.
- Taxon
- Tomato seedlingsSolanum lycopersicume0
- Treatment
- Increased CO 2e2
- Outcome
- photosynthetic capacitye1
- Direction
- raisede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato seedlings”
e1“together with increased light intensity, it raised photosynthetic capacity.”
e2“Increased CO 2 also increased light‐saturated maximum photosynthetic rate”
Claim · model-written summary
Increased carbon dioxide reduced tomato transpiration and water consumption across light levels.
- Taxon
- Tomato seedlingsSolanum lycopersicume0
- Treatment
- increased CO 2e1
- Outcome
- transpiration and water consumptione1
- Direction
- reducede1
- Qualifier
- across different levels of light intensitye1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato seedlings”
e1“increased CO 2 reduced transpiration and water consumption across different levels of light intensity”
Claim · model-written summary
Increased carbon dioxide significantly raised leaf and plant water use efficiency.
- Taxon
- Tomato seedlingsSolanum lycopersicume0
- Outcome
- both leaf‐level and plant‐level water use efficiencye1
- Direction
- increasinge1
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato seedlings”
e1“thus significantly increasing both leaf‐level and plant‐level water use efficiency.”
Claim · model-written summary
The combination of elevated carbon dioxide and high light gave optimal tomato growth and carbon assimilation among tested treatments.
- Taxon
- Tomato seedlingsSolanum lycopersicume0
- Treatment
- increased CO 2 (800 µmol CO 2 mol −1 ) and high light intensity (400 µmol m −2 s −1 )e1
- Outcome
- growth and carbon assimilatione1
- Direction
- optimale1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tomato seedlings”
e1“the combination of increased CO 2 (800 µmol CO 2 mol −1 ) and high light intensity (400 µmol m −2 s −1 ) resulted in optimal growth and carbon assimilation.”
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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.