Abstract
Gas exchange and chlorophyll (Chl) fluorescence were measured on young mature leaves of rose plants (Rosa hybrida cvs. First Red and Twingo) grown in two near-to-tight greenhouses, one under control ambient CO2 concentration, AC (355 µmol mol-1) and one under CO2 enrichment, EC (700 µmol mol-1), during four flushes from late June to early November. Supply of water and mineral elements was non-limiting while temperature was allowed to rise freely during daytime. Leaf diffusive conductance was not significantly reduced at EC but net photosynthetic rate increased by more than 100 %. Although the concentration of total non-structural saccharides was substantially higher in the leaves from the greenhouse with EC, ΦPS2 (quantum efficiency of radiation use) around noon was not significantly reduced at EC indicating that there was no down-regulation of electron transport. Moreover, CO2 enrichment did not cause any increase in the risk of photo-damage, as estimated by the 1 - qP parameter. Non-photochemical quenching was even higher in the greenhouse with EC during the two summer flushes, when temperature and photosynthetic photon flux density (PPFD) were the highest. Hence rose photosynthesis benefits strongly from high concentrations of atmospheric CO2 at both high and moderate temperatures and PPFD.
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Claims 6
Claim · model-written summary
Leaf diffusive conductance of rose plants was not significantly reduced at elevated CO2.
- Taxon
- Rose Plantst0
- Treatment
- Elevated CO2t0
- Outcome
- Leaf diffusive conductancee0
- Direction
- not significantly reducede0
Not reportedComparator
Verbatim
t0“Elevated CO2 on Photosynthesis and Chlorophyll Fluorescence of Rose Plants”
e0“Leaf diffusive conductance was not significantly reduced at EC”
Claim · model-written summary
Net photosynthetic rate of rose plants increased by more than 100 % at elevated CO2.
- Taxon
- Rose Plantst0
- Treatment
- Elevated CO2t0
- Outcome
- net photosynthetic ratee0
- Direction
- increasede0
- Value
- more than 100 %e0
Not reportedComparator
Verbatim
t0“Elevated CO2 on Photosynthesis and Chlorophyll Fluorescence of Rose Plants”
e0“net photosynthetic rate increased by more than 100 %”
Claim · model-written summary
The concentration of total non-structural saccharides was substantially higher in rose leaves from the greenhouse with elevated CO2.
- Taxon
- Rose Plantst0
- Organ / stage
- leavese0
- Treatment
- Elevated CO2t0
- Outcome
- concentration of total non-structural saccharidese0
- Direction
- highere0
Not reportedComparator
Verbatim
t0“Elevated CO2 on Photosynthesis and Chlorophyll Fluorescence of Rose Plants”
e0“the concentration of total non-structural saccharides was substantially higher in the leaves from the greenhouse with EC”
Claim · model-written summary
The quantum efficiency of radiation use (PhiPS2) around noon was not significantly reduced at elevated CO2, indicating no down-regulation of electron transport.
- Taxon
- Rose Plantst0
- Treatment
- Elevated CO2t0
- Outcome
- quantum efficiency of radiation usee0
- Direction
- not significantly reducede0
Not reportedComparator
Verbatim
t0“Elevated CO2 on Photosynthesis and Chlorophyll Fluorescence of Rose Plants”
e0“ΦPS2 (quantum efficiency of radiation use) around noon was not significantly reduced at EC”
Claim · model-written summary
CO2 enrichment did not increase the risk of photo-damage of rose plants, estimated by the 1 - qP parameter.
- Taxon
- Rose Plantst0
- Treatment
- CO2 enrichmente0
- Outcome
- risk of photo-damagee0
- Direction
- did not cause any increasee0
Not reportedComparator
Verbatim
t0“Elevated CO2 on Photosynthesis and Chlorophyll Fluorescence of Rose Plants”
e0“CO2 enrichment did not cause any increase in the risk of photo-damage”
Claim · model-written summary
Non-photochemical quenching was higher in the greenhouse with elevated CO2 during the two summer flushes.
- Taxon
- Rose Plantst0
- Treatment
- Elevated CO2t0
- Outcome
- Non-photochemical quenchinge0
- Direction
- highere0
- Qualifier
- during the two summer flushese0
Not reportedComparator
Verbatim
t0“Elevated CO2 on Photosynthesis and Chlorophyll Fluorescence of Rose Plants”
e0“Non-photochemical quenching was even higher in the greenhouse with EC during the two summer flushes”
The same questions in other papers
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co2 · molecular: metabolites · RosaResults agree
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- positive
- positive
- positive
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.