Abstract
SummaryRooted cuttings of variegated (HV) and fully green (HG) varieties of Hedera helix L. were grown at ambient (35.5 Pa) and elevated (120 Pa) CO2 for 46 d. Initially, the rate of photosynthesis (PN) was 90% higher under elevated CO2 in the green sectors of both HV and HG plants. After 32 d of exposure to high CO2, PN of HG at high CO2 had dropped to that of the ambient CO2 grown plants, while the PN of HV plants remained 48% higher at elevated than at ambient CO2. Vcmax (maximum rate of carboxylation) and Jmax (maximum rate of potential electron transport) of both HV and HG decreased with time at elevated but not at ambient CO2. These reductions were less for HV than for HG. Elevated CO2 increased the relative growth rate (RGR) of the HV but not of the HG plants. The results suggest that leaf variegation may moderate photosynthetic acclimation to elevated CO2, a phenomenon that could be of considerable significance to selection of species for cultivation under conditions of high CO2.
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Claims 7
Claim · model-written summary
Initially, elevated CO2 raised photosynthesis in green sectors of both varieties by 90%.
- Taxon
- Hedera helix L.
Hedera helixt0 - Organ / stage
- green sectorse0
- Treatment
- elevated CO2e0
- Outcome
- rate of photosynthesis (PN)e0
- Direction
- highere0
- Value
- 90%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Initially, the rate of photosynthesis (PN) was 90% higher under elevated CO2 in the green sectors of both HV and HG plants.”
t0“Hedera helix L.”
Claim · model-written summary
After 32 days, photosynthesis in HG under high CO2 dropped to the ambient-CO2 level.
- Taxon
- Hedera helix L.Hedera helixe1
- Material
- HGe0
- Treatment
- high CO2e0
- Outcome
- PNe0
- Direction
- droppede0
- Qualifier
- After 32 de0
- Comparator
- ambient CO2 grown plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 32 d of exposure to high CO2, PN of HG at high CO2 had dropped to that of the ambient CO2 grown plants”
e1“Hedera helix L.”
Claim · model-written summary
After 32 days, HV photosynthesis remained 48% higher under elevated than ambient CO2.
- Taxon
- Hedera helix L.Hedera helixe1
- Material
- HVe0
- Treatment
- elevatede0
- Outcome
- PNe0
- Direction
- highere0
- Value
- 48%e0
- Comparator
- ambient CO2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while the PN of HV plants remained 48% higher at elevated than at ambient CO2”
e1“Hedera helix L.”
Claim · model-written summary
Vcmax decreased over time under elevated CO2 in both varieties, more strongly in HG.
- Taxon
- Hedera helix L.Hedera helixe1
- Material
- both HV and HGe0
- Treatment
- elevatede0
- Outcome
- Vcmax (maximum rate of carboxylation)e0
- Direction
- decreasede0
- Qualifier
- These reductions were less for HV than for HGe0
- Comparator
- ambient CO2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vcmax (maximum rate of carboxylation) and Jmax (maximum rate of potential electron transport) of both HV and HG decreased with time at elevated but not at ambient CO2. These reductions were less for HV than for HG.”
e1“Hedera helix L.”
Claim · model-written summary
Jmax decreased over time under elevated CO2 in both varieties, more strongly in HG.
- Taxon
- Hedera helix L.Hedera helixe1
- Material
- both HV and HGe0
- Treatment
- elevatede0
- Outcome
- Jmax (maximum rate of potential electron transport)e0
- Direction
- decreasede0
- Qualifier
- These reductions were less for HV than for HGe0
- Comparator
- ambient CO2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vcmax (maximum rate of carboxylation) and Jmax (maximum rate of potential electron transport) of both HV and HG decreased with time at elevated but not at ambient CO2. These reductions were less for HV than for HG.”
e1“Hedera helix L.”
Claim · model-written summary
Elevated CO2 increased relative growth rate in HV plants.
- Taxon
- Hedera helix L.Hedera helixe1
- Material
- HVe0
- Treatment
- Elevated CO2e0
- Outcome
- relative growth rate (RGR)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Elevated CO2 increased the relative growth rate (RGR) of the HV but not of the HG plants.”
e1“Hedera helix L.”
Claim · model-written summary
Elevated CO2 did not increase relative growth rate in HG plants.
- Taxon
- Hedera helix L.Hedera helixe1
- Material
- HGe0
- Treatment
- Elevated CO2e0
- Outcome
- relative growth rate (RGR)e0
- Direction
- note0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Elevated CO2 increased the relative growth rate (RGR) of the HV but not of the HG plants.”
e1“Hedera helix L.”
The same questions in other papers
co2 · growth · Hedera helix (English ivy)Results agree
1 paper in the same direction as this paper
- 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.