Abstract
The photosynthetic response to CO2 concentration, light intensity and temperature was investigated in water hyacinth plants (Eichhornia crassipes (Mart.) Solms) grown in summer at ambient CO2 or at 10000 μmol(CO2) mol−1 and in winter at 6000 μmol(CO2) mol−1 Plants grown and measured at ambient CO2 had high photosynthetic rate (35 μmo1(CO2) m−2 s−1), high saturating photon flux density (1500–2000) μmol m−2 s−1 and low sensitivity to temperature in the range 20–40 °C. Maximum photosynthetic rate (63 μmol(CO2) m−2 s−1) was reached at an internal CO2 concentration of 800 μmol mol−1. Plants grown at high CO2 in summer had photosynthetic capacities at ambient CO2 which were 15% less than for plants grown at ambient CO2, but maximum photosynthetic rates were similar. Photosynthesis by plants grown at high CO2 and high light intensity had typical response curves to internal CO2 concentration with saturation at high CO2, but for plants grown under high CO2 and low light and plants grown under low CO2 and high light intensity photosynthetic rates decreased sharply at internal CO2 concentrations above 1000 μmol−1.
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Claims 9
Claim · model-written summary
Water hyacinth grown and measured at ambient CO2 had a high photosynthetic rate (35 μmol CO2 m-2 s-1).
- Taxon
- Water Hyacinth
Pontederia crassipest0 - Outcome
- high photosynthetic ratee0
- Value
- 35 μmo1(CO2) m−2 s−1e0
- Qualifier
- grown and measured at ambient CO2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants grown and measured at ambient CO2 had high photosynthetic rate (35 μmo1(CO2) m−2 s−1)”
t0“Water Hyacinth”
Claim · model-written summary
Plants grown and measured at ambient CO2 had a high saturating photon flux density of 1500-2000 μmol m-2 s-1.
- Taxon
- Water HyacinthPontederia crassipest0
- Outcome
- saturating photon flux densitye0
- Value
- (1500–2000) μmol m−2 s−1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high saturating photon flux density (1500–2000) μmol m−2 s−1”
t0“Water Hyacinth”
Claim · model-written summary
Plants grown and measured at ambient CO2 had low sensitivity to temperature in the range 20-40 °C.
- Taxon
- Water HyacinthPontederia crassipest0
- Outcome
- low sensitivity to temperaturee0
- Qualifier
- 20–40 °Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“low sensitivity to temperature in the range 20–40 °C”
t0“Water Hyacinth”
Claim · model-written summary
Maximum photosynthetic rate (63 μmol CO2 m-2 s-1) was reached at an internal CO2 concentration of 800 μmol mol-1.
- Taxon
- Water HyacinthPontederia crassipest0
- Outcome
- Maximum photosynthetic ratee0
- Value
- 63 μmol(CO2) m−2 s−1e0
- Qualifier
- internal CO2 concentration of 800 μmol mol−1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum photosynthetic rate (63 μmol(CO2) m−2 s−1) was reached at an internal CO2 concentration of 800 μmol mol−1”
t0“Water Hyacinth”
Claim · model-written summary
Plants grown at high CO2 in summer had photosynthetic capacities at ambient CO2 that were 15% less than plants grown at ambient CO2.
- Taxon
- Water HyacinthPontederia crassipest0
- Treatment
- grown at high CO2 in summere0
- Outcome
- photosynthetic capacitiese0
- Direction
- lesse0
- Value
- 15%e0
- Comparator
- plants grown at ambient CO2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants grown at high CO2 in summer had photosynthetic capacities at ambient CO2 which were 15% less than for plants grown at ambient CO2, but maximum photosynthetic rates were similar”
t0“Water Hyacinth”
Claim · model-written summary
Maximum photosynthetic rates were similar between plants grown at high CO2 and at ambient CO2.
- Taxon
- Water HyacinthPontederia crassipest0
- Treatment
- grown at high CO2 in summere0
- Outcome
- maximum photosynthetic ratese0
- Direction
- similare0
- Comparator
- plants grown at ambient CO2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants grown at high CO2 in summer had photosynthetic capacities at ambient CO2 which were 15% less than for plants grown at ambient CO2, but maximum photosynthetic rates were similar”
t0“Water Hyacinth”
Claim · model-written summary
Photosynthesis of plants grown at high CO2 and high light intensity had typical response curves to internal CO2 concentration with saturation at high CO2.
- Taxon
- Water HyacinthPontederia crassipest0
- Treatment
- high CO2 and high light intensitye0
- Outcome
- typical response curves to internal CO2 concentration with saturation at high CO2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Photosynthesis by plants grown at high CO2 and high light intensity had typical response curves to internal CO2 concentration with saturation at high CO2”
t0“Water Hyacinth”
Claim · model-written summary
For plants grown under high CO2 and low light, photosynthetic rates decreased sharply at internal CO2 concentrations above 1000 μmol-1.
- Taxon
- Water HyacinthPontederia crassipest0
- Treatment
- high CO2 and low lighte0
- Outcome
- photosynthetic ratese0
- Direction
- decreased sharplye0
- Qualifier
- internal CO2 concentrations above 1000 μmol−1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“for plants grown under high CO2 and low light and plants grown under low CO2 and high light intensity photosynthetic rates decreased sharply at internal CO2 concentrations above 1000 μmol−1”
t0“Water Hyacinth”
Claim · model-written summary
For plants grown under low CO2 and high light intensity, photosynthetic rates decreased sharply at internal CO2 concentrations above 1000 μmol-1.
- Taxon
- Water HyacinthPontederia crassipest0
- Treatment
- low CO2 and high light intensitye0
- Outcome
- photosynthetic ratese0
- Direction
- decreased sharplye0
- Qualifier
- internal CO2 concentrations above 1000 μmol−1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“for plants grown under high CO2 and low light and plants grown under low CO2 and high light intensity photosynthetic rates decreased sharply at internal CO2 concentrations above 1000 μmol−1”
t0“Water Hyacinth”
The same questions in other papers
co2 · physiology: photosynthesis · Pontederia crassipes (water hyacinth)Positive and negative results
1 in the opposite direction
- 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.