Abstract
Five-year-old Scots pine (Pinus sylvestris L.) seedlings were grown in open-top chambers at ambient and elevated (ambient + 400 &mgr;mol mol(-1)) CO(2) concentrations. Net photosynthesis (A), specific leaf area (SLA) and concentrations of nitrogen (N), carbon (C), soluble sugars, starch and chlorophyll were measured in current-year and 1-year-old needles during the second year of CO(2) enrichment. The elevated CO(2) treatment stimulated photosynthetic rates when measured at the growth CO(2) concentration, but decreased photosynthetic capacity compared with the ambient CO(2) treatment. Acclimation to elevated CO(2) involved decreases in carboxylation efficiency and RuBP regeneration capacity. Compared with the ambient CO(2) treatment, elevated CO(2) reduced light-saturated photosynthesis (when measured at 350 &mgr;mol mol(-1) in both treatments) by 18 and 23% (averaged over the growing season) in current-year and 1-year-old needles, respectively. We observed significant interactive effects of CO(2) treatment, needle age and time during the growing season on photosynthesis. Large seasonal variations in photosynthetic parameters were attributed to changes in needle chemistry, needle structure and feedbacks governed by whole-plant growth dynamics. Down-regulation of photosynthesis was probably a result of reduced N concentration on an area basis, although a downward shift in the relationship between photosynthetic parameters and N was also observed.
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Claims 10
Claim · model-written summary
Elevated CO2 stimulated photosynthesis measured at growth CO2.
- Taxon
- Scots pine
Pinus sylvestrist0 - Treatment
- elevated CO(2) treatmente0
- Outcome
- photosynthetic ratese0
- Direction
- stimulatede0
- Qualifier
- measured at the growth CO(2) concentratione0
- Comparator
- ambient CO(2) treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The elevated CO(2) treatment stimulated photosynthetic rates when measured at the growth CO(2) concentration, but decreased photosynthetic capacity compared with the ambient CO(2) treatment.”
t0“Scots pine”
Claim · model-written summary
Elevated CO2 decreased photosynthetic capacity versus ambient CO2.
- Taxon
- Scots pinePinus sylvestrist0
- Treatment
- elevated CO(2) treatmente0
- Outcome
- photosynthetic capacitye0
- Direction
- decreasede0
- Comparator
- ambient CO(2) treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The elevated CO(2) treatment stimulated photosynthetic rates when measured at the growth CO(2) concentration, but decreased photosynthetic capacity compared with the ambient CO(2) treatment.”
t0“Scots pine”
Claim · model-written summary
Elevated CO2 acclimation decreased carboxylation efficiency.
- Taxon
- Scots pinePinus sylvestrist0
- Treatment
- elevated CO(2)e0
- Outcome
- carboxylation efficiencye0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Acclimation to elevated CO(2) involved decreases in carboxylation efficiency and RuBP regeneration capacity.”
t0“Scots pine”
Claim · model-written summary
Elevated CO2 acclimation decreased RuBP regeneration capacity.
- Taxon
- Scots pinePinus sylvestrist0
- Treatment
- elevated CO(2)e0
- Outcome
- RuBP regeneration capacitye0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Acclimation to elevated CO(2) involved decreases in carboxylation efficiency and RuBP regeneration capacity.”
t0“Scots pine”
Claim · model-written summary
Elevated CO2 reduced current-year needle light-saturated photosynthesis by 18%.
- Taxon
- Scots pinePinus sylvestrist0
- Organ / stage
- current-yeare0
- Treatment
- elevated CO(2)e0
- Outcome
- light-saturated photosynthesise0
- Direction
- reducede0
- Value
- 18e0
- Qualifier
- averaged over the growing seasone0
- Comparator
- ambient CO(2) treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with the ambient CO(2) treatment, elevated CO(2) reduced light-saturated photosynthesis (when measured at 350 &mgr;mol mol(-1) in both treatments) by 18 and 23% (averaged over the growing season) in current-year and 1-year-old needles, respectively.”
t0“Scots pine”
Claim · model-written summary
Elevated CO2 reduced one-year-old needle light-saturated photosynthesis by 23%.
- Taxon
- Scots pinePinus sylvestrist0
- Organ / stage
- 1-year-old needlese0
- Treatment
- elevated CO(2)e0
- Outcome
- light-saturated photosynthesise0
- Direction
- reducede0
- Value
- 23%e0
- Qualifier
- averaged over the growing seasone0
- Comparator
- ambient CO(2) treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with the ambient CO(2) treatment, elevated CO(2) reduced light-saturated photosynthesis (when measured at 350 &mgr;mol mol(-1) in both treatments) by 18 and 23% (averaged over the growing season) in current-year and 1-year-old needles, respectively.”
t0“Scots pine”
Claim · model-written summary
CO2 treatment, needle age and season had significant interactive effects on photosynthesis.
- Taxon
- Scots pinePinus sylvestrist0
- Organ / stage
- needle agee0
- Treatment
- CO(2) treatmente0
- Outcome
- photosynthesise0
- Qualifier
- time during the growing seasone0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We observed significant interactive effects of CO(2) treatment, needle age and time during the growing season on photosynthesis.”
t0“Scots pine”
Claim · model-written summary
Authors attribute seasonal photosynthesis variation to needle chemistry and structure and growth feedbacks.
- Taxon
- Scots pinePinus sylvestrist0
- Outcome
- Large seasonal variations in photosynthetic parameterse0
- Qualifier
- changes in needle chemistry, needle structure and feedbacks governed by whole-plant growth dynamicse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Large seasonal variations in photosynthetic parameters were attributed to changes in needle chemistry, needle structure and feedbacks governed by whole-plant growth dynamics.”
t0“Scots pine”
Claim · model-written summary
Reduced area-based nitrogen probably caused photosynthetic down-regulation.
- Taxon
- Scots pinePinus sylvestrist0
- Outcome
- Down-regulation of photosynthesise0
- Qualifier
- reduced N concentration on an area basise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Down-regulation of photosynthesis was probably a result of reduced N concentration on an area basis”
t0“Scots pine”
Claim · model-written summary
The relation between photosynthetic parameters and nitrogen shifted downward.
- Taxon
- Scots pinePinus sylvestrist0
- Compound
- Ne0
- Outcome
- relationship between photosynthetic parameters and Ne0
- Direction
- downwarde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a downward shift in the relationship between photosynthetic parameters and N was also observed.”
t0“Scots pine”
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See all 13 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.