Abstract
In controlled-environment chambers at 29/33 C day/night and 1000 μE·m -2 ·s -1 photosynthetic photon flux density (PPFD), increasing the CO 2 concentration from 350 to 675 ppm (v/v) did not affect leaf area or total dry weight of well-watered plants of barnyardgrass [ Echinochloa crus-galli (L.) Beauv. # ECHCG], goosegrass [ Eleusine indica (L.) Gaertn. # ELEIN], or southern crabgrass [ Digitaria ciliaris (Retz.) Koel. # DIGSP] after 30 days. However, the whole plant transpiration rate per unit leaf area decreased, and the water use efficiency increased, in response to CO 2 enrichment. In a subsequent experiment, with water availability limited by an imposed drought, CO 2 enrichment reduced the effects of water stress and significantly increased leaf area and total dry weight of the three C 4 grasses and soybean [ Glycine max (L.) Merr. ‘Ransom’]. Growth enhancement in response to CO 2 enrichment was greater in soybean than in the C 4 grasses. By improving their water economy, CO 2 enrichment can increase the growth of both C 3 and C 4 plants under water stress. However, growth stimulation can be expected to be greater in C 3 plants.
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Claims 9
Claim · model-written summary
CO2 enrichment did not change leaf area of well-watered barnyardgrass, goosegrass and southern crabgrass.
- Taxon
- barnyardgrass
Echinochloa crus-gallie0 - Treatment
- increasing the CO 2 concentration from 350 to 675 ppm (v/v)e0
- Outcome
- leaf areae0
- Direction
- did not affecte0
- Qualifier
- well-waterede0
- Comparator
- 350e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing the CO 2 concentration from 350 to 675 ppm (v/v) did not affect leaf area or total dry weight of well-watered plants of barnyardgrass [ Echinochloa crus-galli (L.) Beauv. # ECHCG], goosegrass [ Eleusine indica (L.) Gaertn. # ELEIN], or southern crabgrass [ Digitaria ciliaris (Retz.) Koel. # DIGSP] after 30 days”
Claim · model-written summary
CO2 enrichment did not change total dry weight of well-watered C4 grasses.
- Taxon
- barnyardgrassEchinochloa crus-gallie0
- Treatment
- increasing the CO 2 concentration from 350 to 675 ppm (v/v)e0
- Outcome
- total dry weighte0
- Direction
- did not affecte0
- Qualifier
- well-waterede0
- Comparator
- 350e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing the CO 2 concentration from 350 to 675 ppm (v/v) did not affect leaf area or total dry weight of well-watered plants of barnyardgrass [ Echinochloa crus-galli (L.) Beauv. # ECHCG], goosegrass [ Eleusine indica (L.) Gaertn. # ELEIN], or southern crabgrass [ Digitaria ciliaris (Retz.) Koel. # DIGSP] after 30 days”
Claim · model-written summary
CO2 enrichment decreased transpiration per unit leaf area in the C4 grasses.
- Taxon
- barnyardgrassEchinochloa crus-gallie0
- Treatment
- CO 2 enrichmente1
- Outcome
- whole plant transpiration rate per unit leaf areae1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“barnyardgrass [ Echinochloa crus-galli (L.) Beauv. # ECHCG], goosegrass [ Eleusine indica (L.) Gaertn. # ELEIN], or southern crabgrass [ Digitaria ciliaris (Retz.) Koel. # DIGSP]”
e1“whole plant transpiration rate per unit leaf area decreased, and the water use efficiency increased, in response to CO 2 enrichment”
Claim · model-written summary
CO2 enrichment increased water use efficiency in the C4 grasses.
- Taxon
- barnyardgrassEchinochloa crus-gallie0
- Treatment
- CO 2 enrichmente1
- Outcome
- water use efficiencye1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“barnyardgrass [ Echinochloa crus-galli (L.) Beauv. # ECHCG], goosegrass [ Eleusine indica (L.) Gaertn. # ELEIN], or southern crabgrass [ Digitaria ciliaris (Retz.) Koel. # DIGSP]”
e1“whole plant transpiration rate per unit leaf area decreased, and the water use efficiency increased, in response to CO 2 enrichment”
Claim · model-written summary
Under drought, CO2 enrichment reduced water stress effects in C4 grasses and soybean.
- Taxon
- soybean
Glycine maxe0 - Treatment
- CO 2 enrichmente0
- Outcome
- effects of water stresse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CO 2 enrichment reduced the effects of water stress and significantly increased leaf area and total dry weight of the three C 4 grasses and soybean [ Glycine max (L.) Merr. ‘Ransom’]”
Claim · model-written summary
Under drought, CO2 enrichment significantly increased leaf area of soybean and C4 grasses.
- Taxon
- soybeanGlycine maxe0
- Treatment
- CO 2 enrichmente0
- Outcome
- leaf areae0
- Direction
- increasede0
- Qualifier
- the three C 4 grassese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CO 2 enrichment reduced the effects of water stress and significantly increased leaf area and total dry weight of the three C 4 grasses and soybean [ Glycine max (L.) Merr. ‘Ransom’]”
Claim · model-written summary
Under drought, CO2 enrichment significantly increased total dry weight of soybean and C4 grasses.
- Taxon
- soybeanGlycine maxe0
- Treatment
- CO 2 enrichmente0
- Outcome
- total dry weighte0
- Direction
- increasede0
- Qualifier
- the three C 4 grassese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CO 2 enrichment reduced the effects of water stress and significantly increased leaf area and total dry weight of the three C 4 grasses and soybean [ Glycine max (L.) Merr. ‘Ransom’]”
Claim · model-written summary
Growth enhancement from CO2 enrichment was greater in soybean than in C4 grasses.
- Taxon
- soybeanGlycine maxe0
- Treatment
- CO 2 enrichmente0
- Outcome
- Growth enhancemente0
- Direction
- greatere0
- Comparator
- the C 4 grassese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth enhancement in response to CO 2 enrichment was greater in soybean than in the C 4 grasses”
Claim · model-written summary
The authors expect greater growth stimulation in C3 than C4 plants.
Verbatim
e0“growth stimulation can be expected to be greater in C 3 plants”
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co2 · physiology: gas exchange · Echinochloa crus-galli (barnyard grass)Positive and negative results
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co2 · growth · Echinochloa crus-galli (barnyard grass)Positive and negative results
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82 papers in the same direction as this paper · 16 in the opposite direction · 2 reporting no difference from an alternative
- positive
- positive
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See all 101 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.