Abstract
The allocation of photosynthates is the result of complex competitive interactions between sinks for available photosynthate. The objective of this research was to determine if altered photosynthate supplies would change the normal partitioning patterns in young sugarbeet plants. Photosynthetic rates were enhanced by CO 2 enrichment and photorespiration was reduced by a combination of high CO 2 and low O 2 . The plants were grown in growth chambers having day‐night temperatures of 28/22 C with a photoperiod of 16 hours. When the first true leaves appeared, the seedlings were placed in treatment chambers within the larger growth chambers, and the following combinations of oxygen and carbon dioxide were established (% O 2 — ppm CO 2 ): 21‐300; 21‐1,000; 5‐300; 5‐1,000. Photon Flux Density within the treatment chambers was 320 /μE/m 2 /sec. The plants were maintained within the chambers for 10 days. Elevated CO2 enhanced total dry matter accumulation by 180% but low O 2 had no significant effect. The final dry matter accumulation expressed on a final leaf area basis was increased 56 and 19% by 1,000 ppm CO 2 and 5% O 2 respectively. The additional photosynthate resulting from enhanced photosynthesis was allocated preferentially to the root sink. The primary effect of low O 2 was to enhance root diameter and leaf number, but low O 2 had little effect on other growth characteristics. Results indicate that the young sugarbeet root is the preferred sink for additional photosynthate.
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Claims 10
Claim · model-written summary
CO 2 enrichment enhanced Photosynthetic rates.
- Taxon
- Sugarbeet Seedling
Beta vulgaris subsp. vulgarist0 - Treatment
- CO 2 enrichmente0
- Outcome
- Photosynthetic ratese0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Growth of Sugarbeet Seedling in Various Atmospheres of Oxygen and Carbon Dioxide1”
e0“Photosynthetic rates were enhanced by CO 2 enrichment and photorespiration was reduced by a combination of high CO 2 and low O 2 .”
Claim · model-written summary
high CO 2 and low O 2 reduced photorespiration.
- Taxon
- Sugarbeet SeedlingBeta vulgaris subsp. vulgarist0
- Treatment
- high CO 2 and low O 2e0
- Outcome
- photorespiratione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Growth of Sugarbeet Seedling in Various Atmospheres of Oxygen and Carbon Dioxide1”
e0“Photosynthetic rates were enhanced by CO 2 enrichment and photorespiration was reduced by a combination of high CO 2 and low O 2 .”
Claim · model-written summary
Elevated CO2 increased total dry matter accumulation by 180%.
- Taxon
- Sugarbeet SeedlingBeta vulgaris subsp. vulgarist0
- Treatment
- Elevated CO2e0
- Outcome
- total dry matter accumulatione0
- Direction
- enhancede0
- Value
- 180%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Growth of Sugarbeet Seedling in Various Atmospheres of Oxygen and Carbon Dioxide1”
e0“Elevated CO2 enhanced total dry matter accumulation by 180% but low O 2 had no significant effect.”
Claim · model-written summary
Low O 2 had no significant effect on total dry matter accumulation.
- Taxon
- Sugarbeet SeedlingBeta vulgaris subsp. vulgarist0
- Treatment
- low O 2e0
- Outcome
- total dry matter accumulatione0
- Direction
- no significant effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Growth of Sugarbeet Seedling in Various Atmospheres of Oxygen and Carbon Dioxide1”
e0“Elevated CO2 enhanced total dry matter accumulation by 180% but low O 2 had no significant effect.”
Claim · model-written summary
1,000 ppm CO 2 increased final dry matter per leaf area by 56.
- Taxon
- Sugarbeet SeedlingBeta vulgaris subsp. vulgarist0
- Treatment
- 1,000 ppm CO 2e0
- Outcome
- final dry matter accumulation expressed on a final leaf area basise0
- Direction
- increasede0
- Value
- 56e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Growth of Sugarbeet Seedling in Various Atmospheres of Oxygen and Carbon Dioxide1”
e0“The final dry matter accumulation expressed on a final leaf area basis was increased 56 and 19% by 1,000 ppm CO 2 and 5% O 2 respectively.”
Claim · model-written summary
5% O 2 increased final dry matter per leaf area by 19%.
- Taxon
- Sugarbeet SeedlingBeta vulgaris subsp. vulgarist0
- Treatment
- 5% O 2e0
- Outcome
- final dry matter accumulation expressed on a final leaf area basise0
- Direction
- increasede0
- Value
- 19%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Growth of Sugarbeet Seedling in Various Atmospheres of Oxygen and Carbon Dioxide1”
e0“The final dry matter accumulation expressed on a final leaf area basis was increased 56 and 19% by 1,000 ppm CO 2 and 5% O 2 respectively.”
Claim · model-written summary
Additional photosynthate from enhanced photosynthesis was preferentially allocated to roots.
- Taxon
- Sugarbeet SeedlingBeta vulgaris subsp. vulgarist0
- Organ / stage
- root sinke0
- Outcome
- allocated preferentially to the root sinke0
- Qualifier
- enhanced photosynthesise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Growth of Sugarbeet Seedling in Various Atmospheres of Oxygen and Carbon Dioxide1”
e0“The additional photosynthate resulting from enhanced photosynthesis was allocated preferentially to the root sink.”
Claim · model-written summary
Low O 2 had enhance on root diameter and leaf number.
- Taxon
- Sugarbeet SeedlingBeta vulgaris subsp. vulgarist0
- Treatment
- low O 2e0
- Outcome
- root diameter and leaf numbere0
- Direction
- enhancee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Growth of Sugarbeet Seedling in Various Atmospheres of Oxygen and Carbon Dioxide1”
e0“The primary effect of low O 2 was to enhance root diameter and leaf number, but low O 2 had little effect on other growth characteristics.”
Claim · model-written summary
Low O 2 had little effect on other growth characteristics.
- Taxon
- Sugarbeet SeedlingBeta vulgaris subsp. vulgarist0
- Treatment
- low O 2e0
- Outcome
- other growth characteristicse0
- Direction
- little effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Growth of Sugarbeet Seedling in Various Atmospheres of Oxygen and Carbon Dioxide1”
e0“The primary effect of low O 2 was to enhance root diameter and leaf number, but low O 2 had little effect on other growth characteristics.”
Claim · model-written summary
The young sugarbeet root is the preferred sink for extra photosynthate.
- Taxon
- sugarbeetBeta vulgaris subsp. vulgarise0
- Organ / stage
- roote0
- Outcome
- preferred sink for additional photosynthatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Growth of Sugarbeet Seedling in Various Atmospheres of Oxygen and Carbon Dioxide1”
e0“Results indicate that the young sugarbeet root is the preferred sink for additional photosynthate.”
The same questions in other papers
co2 · physiology: photosynthesis · Beta vulgaris (beet)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
co2 · yield · Beta vulgaris (beet)Results agree
5 papers in the same direction as this paper
- positive
- positive
- positive
2 papers more in this group
See all 6 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.