Abstract
In order to estimate the effects of "global warming" on plants, the effects of carbon dioxide concentration (500 ppm or 1000 ppm CO2) and/or relative humidity (37% or 79% RH) on the growth and the transpiration of several C3 plants and a C4 plant (corn) were investigated by using artificially-lighted growth cabinets. The dry weight growths of all species, especially C3 plants, were accelerated by an elevated concentration of CO2, but were reduced, especially tomato and eggplant, by lowering RH. The leaf area growths of tomato and eggplant were accelerated by a high CO2, while those of all species were reduced by a low RH. A high CO2 increased net assimilation rates (NARs) more than relative growth rates (RGRs) of all species. It decreased leaf area ratio (LAR) due to a decrease in specific leaf area (SLA). A low RH decreased RGRs of all plants. while it affected NARs or LARs of some species. The partitioning of dry matter was insignificantly affected by CO2 or RH. Effects of CO2 on the transpiration rate were not observed clearly with C3 species, though a high CO2 decreased the transpiration of corn obviously. A low RH increased the transpiration rates of all species. From these results, the water use efficiencies of many plants, especially corn were kept at a high level by a high CO2 with a high RH condition. The interactive effects between CO2 and RH on the growth and the transpiration were insignificantly observed in these plants.
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Claims 14
Claim · model-written summary
Elevated CO2 accelerated dry weight growth, especially in C3 plants.
- Taxon
- C3 plantse0
- Treatment
- elevated concentration of CO2e0
- Outcome
- dry weight growthse0
- Direction
- acceleratede0
Not reportedComparator
Verbatim
e0“The dry weight growths of all species, especially C3 plants, were accelerated by an elevated concentration of CO2”
t0“SEVERAL PLANTS”
Claim · model-written summary
Lower RH reduced dry weight growth, especially in tomato and eggplant.
- Taxon
- tomato and eggplant
Solanum lycopersicum
Solanum melongenae0 - Treatment
- lowering RHe0
- Outcome
- dry weight growthse1
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“were reduced, especially tomato and eggplant, by lowering RH”
e1“The dry weight growths of all species, especially C3 plants, were accelerated by an elevated concentration of CO2”
Claim · model-written summary
High CO2 accelerated leaf area growth in tomato and eggplant.
- Taxon
- tomato and eggplantSolanum lycopersicumSolanum melongenae0
- Treatment
- high CO2e0
- Outcome
- leaf area growthse0
- Direction
- acceleratede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The leaf area growths of tomato and eggplant were accelerated by a high CO2”
Claim · model-written summary
Low RH reduced leaf area growth in all species.
Not reportedComparator
Verbatim
e0“those of all species were reduced by a low RH”
e1“The leaf area growths of tomato and eggplant were accelerated by a high CO2”
t0“SEVERAL PLANTS”
Claim · model-written summary
High CO2 increased NAR more than RGR in all species.
Verbatim
e0“A high CO2 increased net assimilation rates (NARs) more than relative growth rates (RGRs) of all species”
t0“SEVERAL PLANTS”
Claim · model-written summary
High CO2 decreased leaf area ratio through lower specific leaf area.
Verbatim
e0“It decreased leaf area ratio (LAR) due to a decrease in specific leaf area (SLA)”
t0“SEVERAL PLANTS”
Claim · model-written summary
Low RH decreased relative growth rates in all plants.
- Taxon
- plantsViridiplantaee0
- Treatment
- low RHe0
- Outcome
- RGRse0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“A low RH decreased RGRs of all plants”
Claim · model-written summary
Low RH affected NAR or LAR in some species.
Not reportedComparatorDirection
Verbatim
e0“it affected NARs or LARs of some species”
e1“A low RH decreased RGRs of all plants”
t0“SEVERAL PLANTS”
Claim · model-written summary
CO2 and RH had insignificant effects on dry matter partitioning.
Not reportedComparatorDirection
Verbatim
e0“The partitioning of dry matter was insignificantly affected by CO2 or RH”
t0“SEVERAL PLANTS”
Claim · model-written summary
CO2 effects on C3 species transpiration were unclear.
Not reportedComparatorDirection
Verbatim
e0“Effects of CO2 on the transpiration rate were not observed clearly with C3 species”
Claim · model-written summary
High CO2 decreased corn transpiration.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- high CO2e0
- Outcome
- transpiratione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a high CO2 decreased the transpiration of corn”
Claim · model-written summary
Low RH increased transpiration rates in all species.
Not reportedComparator
Verbatim
e0“A low RH increased the transpiration rates of all species”
t0“SEVERAL PLANTS”
Claim · model-written summary
High CO2 with high RH maintained high water use efficiency, especially in corn.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- a high CO2 with a high RH conditione0
- Outcome
- water use efficienciese0
- Direction
- kept at a high levele0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water use efficiencies of many plants, especially corn were kept at a high level by a high CO2 with a high RH condition”
Claim · model-written summary
CO2 and RH interaction effects on growth and transpiration were insignificant.
Not reportedComparatorDirection
Verbatim
e0“The interactive effects between CO2 and RH on the growth and the transpiration were insignificantly observed in these plants”
t0“SEVERAL PLANTS”
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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.