Abstract
Tomato crops were grown in greenhouses with and without CO 2 enrichment to approximately 900 vpm. Plants grown under enhanced CO 2 concentrations flowered earlier and produced 30% more marketable fruit than those grown in normal air. Measurements were conducted on CO 2 and water vapor exchanges in apical and basal leaves under a range of irradiances and CO 2 concentrations. Photosynthesis rates were higher in leaves from the enriched regime at test irradiances above 50 μE m −2 s −1 (400–700 nm). Increasing test CO 2 concentration enlarged that difference, with the effect being most pronounced in apical leaves. Mesophyll resistance to CO 2 assimilation was greater than stomatal resistance at all irradiances, and tended to be higher in basal leaves than in apical leaves of the CO 2 -enriched plants. Stomatal resistances were similar in apical and basal leaves from CO 2 -enriched plants. In unenriched plants, however, stomatal resistances were lower in apical than in basal leaves. CO 2 compensation points were decreased in leaves developed under CO 2 enrichment, but dark respiration rates were not significantly affected by growth regime. Behavioral indices of photosynthesis indicated that the efficiency of CO 2 utilization was improved by growth in a CO 2 -enriched regime. Such fundamental changes in photosynthetic behavior suggest that the effects of CO 2 enrichment on yield are not only due to increased growth in the presence of additional photosynthetic substrate. They also result from changes in the innate capacity of photosynthetic systems to utilize CO 2 .
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Claims 12
Claim · model-written summary
CO2-enriched tomato plants flowered earlier.
- Taxon
- tomato
Solanum lycopersicumt0 - Treatment
- enhanced CO 2 concentrationse2
- Outcome
- flowerede2
- Direction
- earliere2
- Comparator
- normal aire2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“EFFECTS OF GREENHOUSE CO2 ENRICHMENT ON THE YIELD AND PHOTOSYNTHETIC PHYSIOLOGY OF TOMATO PLANTS”
e2“Plants grown under enhanced CO 2 concentrations flowered earlier and produced 30% more marketable fruit than those grown in normal air”
Claim · model-written summary
CO2-enriched tomato plants produced 30% more marketable fruit than plants in normal air.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- enhanced CO 2 concentrationse2
- Outcome
- marketable fruite2
- Direction
- moree2
- Value
- 30%e2
- Comparator
- normal aire2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“EFFECTS OF GREENHOUSE CO2 ENRICHMENT ON THE YIELD AND PHOTOSYNTHETIC PHYSIOLOGY OF TOMATO PLANTS”
e2“Plants grown under enhanced CO 2 concentrations flowered earlier and produced 30% more marketable fruit than those grown in normal air”
Claim · model-written summary
Leaves from the CO2-enriched regime had higher photosynthesis rates at test irradiances above 50 μE m −2 s −1.
- Taxon
- tomatoSolanum lycopersicumt0
- Organ / stage
- leavese3
- Treatment
- enriched regimee3
- Outcome
- Photosynthesis ratese3
- Direction
- highere3
- Qualifier
- at test irradiances above 50 μE m −2 s −1 (400–700 nm)e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“EFFECTS OF GREENHOUSE CO2 ENRICHMENT ON THE YIELD AND PHOTOSYNTHETIC PHYSIOLOGY OF TOMATO PLANTS”
e3“Photosynthesis rates were higher in leaves from the enriched regime at test irradiances above 50 μE m −2 s −1 (400–700 nm)”
Claim · model-written summary
Increasing test CO2 concentration enlarged the photosynthesis difference between CO2-enriched and other leaves, most in apical leaves.
- Taxon
- tomatoSolanum lycopersicumt0
- Organ / stage
- apical leavese4
- Treatment
- Increasing test CO 2 concentratione4
- Outcome
- differencee4
- Direction
- enlargede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“EFFECTS OF GREENHOUSE CO2 ENRICHMENT ON THE YIELD AND PHOTOSYNTHETIC PHYSIOLOGY OF TOMATO PLANTS”
e4“Increasing test CO 2 concentration enlarged that difference, with the effect being most pronounced in apical leaves”
Claim · model-written summary
Mesophyll resistance to CO2 assimilation was greater than stomatal resistance at all irradiances.
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- Mesophyll resistance to CO 2 assimilatione5
- Direction
- greatere5
- Comparator
- stomatal resistancee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“EFFECTS OF GREENHOUSE CO2 ENRICHMENT ON THE YIELD AND PHOTOSYNTHETIC PHYSIOLOGY OF TOMATO PLANTS”
e5“Mesophyll resistance to CO 2 assimilation was greater than stomatal resistance at all irradiances”
Claim · model-written summary
Mesophyll resistance tended to be higher in basal leaves than in apical leaves of CO2-enriched plants.
- Taxon
- tomatoSolanum lycopersicumt0
- Organ / stage
- basal leavese6
- Outcome
- Mesophyll resistancee5
- Direction
- highere6
- Qualifier
- tended to bee6
- Comparator
- apical leavese6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“EFFECTS OF GREENHOUSE CO2 ENRICHMENT ON THE YIELD AND PHOTOSYNTHETIC PHYSIOLOGY OF TOMATO PLANTS”
e5“Mesophyll resistance to CO 2 assimilation was greater than stomatal resistance at all irradiances”
e6“tended to be higher in basal leaves than in apical leaves of the CO 2 -enriched plants”
Claim · model-written summary
Stomatal resistances were similar in apical and basal leaves of CO2-enriched plants.
- Taxon
- tomatoSolanum lycopersicumt0
- Organ / stage
- apical and basal leavese7
- Outcome
- Stomatal resistancese7
- Direction
- similare7
- Qualifier
- CO 2 -enriched plantse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“EFFECTS OF GREENHOUSE CO2 ENRICHMENT ON THE YIELD AND PHOTOSYNTHETIC PHYSIOLOGY OF TOMATO PLANTS”
e7“Stomatal resistances were similar in apical and basal leaves from CO 2 -enriched plants”
Claim · model-written summary
In unenriched plants, stomatal resistances were lower in apical than in basal leaves.
- Taxon
- tomatoSolanum lycopersicumt0
- Organ / stage
- apicale0
- Outcome
- stomatal resistancese0
- Direction
- lowere0
- Qualifier
- unenriched plantse0
- Comparator
- basal leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“EFFECTS OF GREENHOUSE CO2 ENRICHMENT ON THE YIELD AND PHOTOSYNTHETIC PHYSIOLOGY OF TOMATO PLANTS”
e0“In unenriched plants, however, stomatal resistances were lower in apical than in basal leaves”
Claim · model-written summary
CO2 compensation points were decreased in leaves developed under CO2 enrichment.
- Taxon
- tomatoSolanum lycopersicumt0
- Organ / stage
- leavese0
- Treatment
- CO 2 enrichmente0
- Outcome
- CO 2 compensation pointse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“EFFECTS OF GREENHOUSE CO2 ENRICHMENT ON THE YIELD AND PHOTOSYNTHETIC PHYSIOLOGY OF TOMATO PLANTS”
e0“CO 2 compensation points were decreased in leaves developed under CO 2 enrichment, but dark respiration rates were not significantly affected by growth regime”
Claim · model-written summary
Dark respiration rates were not significantly affected by growth regime.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- growth regimee0
- Outcome
- dark respiration ratese0
- Direction
- not significantly affectede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“EFFECTS OF GREENHOUSE CO2 ENRICHMENT ON THE YIELD AND PHOTOSYNTHETIC PHYSIOLOGY OF TOMATO PLANTS”
e0“CO 2 compensation points were decreased in leaves developed under CO 2 enrichment, but dark respiration rates were not significantly affected by growth regime”
Claim · model-written summary
Growth in a CO2-enriched regime improved the efficiency of CO2 utilization.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- growth in a CO 2 -enriched regimee0
- Outcome
- efficiency of CO 2 utilizatione0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“EFFECTS OF GREENHOUSE CO2 ENRICHMENT ON THE YIELD AND PHOTOSYNTHETIC PHYSIOLOGY OF TOMATO PLANTS”
e0“Behavioral indices of photosynthesis indicated that the efficiency of CO 2 utilization was improved by growth in a CO 2 -enriched regime”
Claim · model-written summary
CO2 enrichment affects tomato yield partly through changes in the innate capacity of photosynthetic systems to use CO2, not only through extra substrate for growth.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- CO 2 enrichmente1
- Outcome
- the effects of CO 2 enrichment on yielde1
- Qualifier
- changes in the innate capacity of photosynthetic systems to utilize CO 2e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“EFFECTS OF GREENHOUSE CO2 ENRICHMENT ON THE YIELD AND PHOTOSYNTHETIC PHYSIOLOGY OF TOMATO PLANTS”
e1“the effects of CO 2 enrichment on yield are not only due to increased growth in the presence of additional photosynthetic substrate. They also result from changes in the innate capacity of photosynthetic systems to utilize CO 2”
The same questions in other papers
co2 · quality: postharvest · Solanum lycopersicum (tomato)Results differ
12 papers in the same direction as this paper · 4 in the opposite direction
- positive
- negative
- no effect
13 papers more in this group
See all 17 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.