Abstract
Abstract Tobacco ( Nicotiana tabacum L.), essentially a nursery plant during seedling growth, is grown in a protected plant bed until it attains the size to be transplanted into the field. Enchancement of growth rates during seedling culture would have advantages in production of tobacco seedlings, as well as bedding plants. Enrichment of atmospheric CO 2 is a generally recognized technique of increasing growth rates. Experiments were conducted in controlled‐environment chambers to evaluate the immediate effects of CO 2 enrichment on seedling growth of tobacco, the carryover effects to post‐transplant growth, and nutritional requirements for maximum response to CO 2 enrichment. Tobacco seedlings were grown at two rates of nutrient application in atmospheres containing either ambient (400 ppm) or enriched (1,000 ppm) CO 2 levels. At the time of transplanting half of the plants from each CO 2 environment were reciprocally exchanged. During seedling culture, Relative Growth Rate (RGR) was enhanced CO 2 enrichment but was depressed by the higher nutrient application rate. The RGR to CO 2 enrichment was reversed during post‐transplant culture. For either CO 2 environment, RGR during seedling growth was nearly three‐fold RGR during posttransplant culture. The reduction in RGR with CO 2 enrichment occurred for both a 9‐hour and a 15‐hour light period of 450 hectolux intensity. The lower RGR for CO 2 enrichment during post‐transplant culture was associated with increased starch in leaf tissues. These data support the hypothesis that, although growth response may temporarily be enhanced by CO 2 enrichment, it must decline to a level similar to that of plants raised under ambient CO 2 .
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Claims 8
Claim · model-written summary
CO2 enrichment enhanced seedling relative growth rate.
- Taxon
- Tobacco
Nicotiana tabacume1 - Treatment
- enriched (1,000 ppm) CO 2e1
- Outcome
- Relative Growth Rate (RGR)e0
- Direction
- enhancede0
- Comparator
- ambient (400 ppm)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During seedling culture, Relative Growth Rate (RGR) was enhanced CO 2 enrichment”
e1“Tobacco seedlings were grown at two rates of nutrient application in atmospheres containing either ambient (400 ppm) or enriched (1,000 ppm) CO 2 levels.”
Claim · model-written summary
Higher nutrient application depressed seedling relative growth rate.
- Taxon
- TobaccoNicotiana tabacume1
- Treatment
- higher nutrient application ratee0
- Outcome
- Relative Growth Rate (RGR)e0
- Direction
- depressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Relative Growth Rate (RGR) was enhanced CO 2 enrichment but was depressed by the higher nutrient application rate”
e1“Tobacco seedlings were grown at two rates of nutrient application”
Claim · model-written summary
The growth-rate response to CO2 enrichment reversed after transplanting.
- Taxon
- TobaccoNicotiana tabacumt0
- Organ / stage
- post‐transplant culturee0
- Treatment
- CO 2 enrichmente0
- Outcome
- RGRe0
- Direction
- reversede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The RGR to CO 2 enrichment was reversed during post‐transplant culture.”
t0“Tobacco Plants”
Claim · model-written summary
Seedling RGR was nearly threefold post-transplant RGR in either CO2 environment.
- Taxon
- TobaccoNicotiana tabacumt0
- Outcome
- RGR during seedling growthe0
- Value
- nearly three‐folde0
- Comparator
- RGR during posttransplant culturee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For either CO 2 environment, RGR during seedling growth was nearly three‐fold RGR during posttransplant culture.”
t0“Tobacco Plants”
Claim · model-written summary
CO2 enrichment reduced post-transplant RGR under a 9-hour light period.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- CO 2 enrichmente0
- Outcome
- RGRe0
- Direction
- reductione0
- Qualifier
- 9‐houre0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The reduction in RGR with CO 2 enrichment occurred for both a 9‐hour and a 15‐hour light period of 450 hectolux intensity.”
t0“Tobacco Plants”
Claim · model-written summary
CO2 enrichment reduced post-transplant RGR under a 15-hour light period.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- CO 2 enrichmente0
- Outcome
- RGRe0
- Direction
- reductione0
- Qualifier
- 15‐houre0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The reduction in RGR with CO 2 enrichment occurred for both a 9‐hour and a 15‐hour light period of 450 hectolux intensity.”
t0“Tobacco Plants”
Claim · model-written summary
Lower post-transplant RGR after CO2 enrichment was associated with more leaf starch.
- Taxon
- TobaccoNicotiana tabacumt0
- Organ / stage
- leaf tissuese0
- Treatment
- CO 2 enrichmente0
- Compound
- starche0
- Outcome
- RGRe0
- Direction
- lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The lower RGR for CO 2 enrichment during post‐transplant culture was associated with increased starch in leaf tissues.”
t0“Tobacco Plants”
Claim · model-written summary
The authors infer that the temporary growth benefit from CO2 enrichment must decline toward ambient-grown plants.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- CO 2 enrichmente0
- Outcome
- growth responsee0
- Direction
- declinee0
- Comparator
- plants raised under ambient CO 2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“although growth response may temporarily be enhanced by CO 2 enrichment, it must decline to a level similar to that of plants raised under ambient CO 2”
t0“Tobacco Plants”
The same questions in other papers
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- no effect
- negative
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See all 182 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.