Abstract
Responses to CO 2 enrichment were determined for a dwarf (MiniMax) and a normal-sized (Fiskeby) soybean [Glycine max (L.) Merr.]. Plants were grown in growth chambers with ambient (36 Pa) or elevated (98 Pa) CO 2 using a 2 × 2 × 2 factorial design. Harvests for MiniMax and Fiskeby were increased 6 and 26 d, respectively, by CO 2 enrichment. At final maturity, mean biomass for MiniMax and Fiskeby was 53 and 197 g, respectively, in the ambient CO 2 treatment and these values were 48 and 199% greater, respectively, in response to CO 2 enrichment. Root development was constrained in MiniMax and, unlike Fiskeby, all of the biomass attributed to CO 2 enrichment was in the shoot. Cultivar differences were not detected for CO 2 assimilation rates, stomatal conductance or substomatal CO 2 concentrations. Foliar sucrose was 43% greater (P < 0.05) in MiniMax than in Fiskeby. Pods per plant, total seed mass per plant, seed number per plant and seed oil content were greater for Fiskeby than MiniMax. Seeds of Fiskeby were 75% greater by mass than those of MiniMax. Seed mass of Fiskeby increased about 50% in response to CO 2 enrichment, whereas MiniMax was unchanged. Root growth, seed size, seeds per pod and starch accumulation rates for MiniMax were unaffected by CO 2 enrichment. The above findings suggested that growth of the dwarf genotype under elevated CO 2 was sink limited.Key words: Elevated CO 2 , atmospheric change, photosynthate partitioning, harvest index, soybean genotypes
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Claims 15
Claim · model-written summary
Elevated CO2 increased harvest timing by 6 d for MiniMax and 26 d for Fiskeby.
- Taxon
- soybean
Glycine maxt0 - Material
- MiniMax and Fiskebye1
- Treatment
- CO 2 enrichmente1
- Outcome
- Harvestse1
- Direction
- increasede1
- Value
- 6 and 26 de1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean cultivar”
e1“Harvests for MiniMax and Fiskeby were increased 6 and 26 d, respectively, by CO 2 enrichment”
Claim · model-written summary
At final maturity under ambient CO2, mean biomass was 53 g for MiniMax and 197 g for Fiskeby.
- Taxon
- soybeanGlycine maxt0
- Material
- MiniMax and Fiskebye2
- Treatment
- ambient CO 2 treatmente2
- Outcome
- mean biomasse2
- Value
- 53 and 197 ge2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean cultivar”
e2“At final maturity, mean biomass for MiniMax and Fiskeby was 53 and 197 g, respectively, in the ambient CO 2 treatment and these values were 48 and 199% greater, respectively, in response to CO 2 enrichment”
Claim · model-written summary
Elevated CO2 increased mean biomass by 48% for MiniMax and 199% for Fiskeby relative to ambient CO2.
- Taxon
- soybeanGlycine maxt0
- Material
- MiniMax and Fiskebye2
- Treatment
- CO 2 enrichmente2
- Outcome
- mean biomasse2
- Direction
- greatere2
- Value
- 48 and 199%e2
- Comparator
- ambient CO 2 treatmente2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean cultivar”
e2“At final maturity, mean biomass for MiniMax and Fiskeby was 53 and 197 g, respectively, in the ambient CO 2 treatment and these values were 48 and 199% greater, respectively, in response to CO 2 enrichment”
Claim · model-written summary
Elevated CO2 increased seed mass of Fiskeby by about 50%.
- Taxon
- soybeanGlycine maxt0
- Material
- Fiskebye1
- Treatment
- CO 2 enrichmente1
- Outcome
- Seed masse1
- Direction
- increasede1
- Value
- about 50%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean cultivar”
e1“Seed mass of Fiskeby increased about 50% in response to CO 2 enrichment, whereas MiniMax was unchanged”
Claim · model-written summary
Elevated CO2 left seed mass of MiniMax unchanged.
- Taxon
- soybeanGlycine maxt0
- Material
- MiniMaxe1
- Treatment
- CO 2 enrichmente1
- Outcome
- Seed masse1
- Direction
- unchangede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean cultivar”
e1“Seed mass of Fiskeby increased about 50% in response to CO 2 enrichment, whereas MiniMax was unchanged”
Claim · model-written summary
Root development was constrained in MiniMax.
- Taxon
- soybeanGlycine maxt0
- Material
- MiniMaxe3
- Outcome
- Root developmente3
- Direction
- constrainede3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean cultivar”
e3“Root development was constrained in MiniMax and, unlike Fiskeby, all of the biomass attributed to CO 2 enrichment was in the shoot”
Claim · model-written summary
In MiniMax, all biomass attributed to CO2 enrichment was in the shoot, unlike Fiskeby.
- Taxon
- soybeanGlycine maxt0
- Material
- MiniMaxe3
- Organ / stage
- shoote3
- Treatment
- CO 2 enrichmente3
- Outcome
- biomass attributed to CO 2 enrichmente3
- Comparator
- Fiskebye3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean cultivar”
e3“Root development was constrained in MiniMax and, unlike Fiskeby, all of the biomass attributed to CO 2 enrichment was in the shoot”
Claim · model-written summary
Cultivar differences were not detected for CO2 assimilation rates, stomatal conductance or substomatal CO2 concentrations.
- Taxon
- soybeanGlycine maxt0
- Outcome
- CO 2 assimilation rates, stomatal conductance or substomatal CO 2 concentrationse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean cultivar”
e4“Cultivar differences were not detected for CO 2 assimilation rates, stomatal conductance or substomatal CO 2 concentrations”
Claim · model-written summary
Foliar sucrose was 43% greater in MiniMax than in Fiskeby.
- Taxon
- soybeanGlycine maxt0
- Material
- MiniMaxe5
- Outcome
- Foliar sucrosee5
- Direction
- greatere5
- Value
- 43%e5
- Comparator
- Fiskebye5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean cultivar”
e5“Foliar sucrose was 43% greater (P < 0.05) in MiniMax than in Fiskeby”
Claim · model-written summary
Pods per plant, total seed mass per plant and seed number per plant were greater for Fiskeby than for MiniMax.
- Taxon
- soybeanGlycine maxt0
- Material
- Fiskebye6
- Outcome
- Pods per plant, total seed mass per plant, seed number per plante6
- Direction
- greatere6
- Comparator
- MiniMaxe6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean cultivar”
e6“Pods per plant, total seed mass per plant, seed number per plant and seed oil content were greater for Fiskeby than MiniMax”
Claim · model-written summary
Seed oil content was greater for Fiskeby than for MiniMax.
- Taxon
- soybeanGlycine maxt0
- Material
- Fiskebye6
- Outcome
- seed oil contente6
- Direction
- greatere6
- Comparator
- MiniMaxe6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean cultivar”
e6“Pods per plant, total seed mass per plant, seed number per plant and seed oil content were greater for Fiskeby than MiniMax”
Claim · model-written summary
Seeds of Fiskeby were 75% greater by mass than those of MiniMax.
- Taxon
- soybeanGlycine maxt0
- Material
- Fiskebye7
- Outcome
- Seedse7
- Direction
- greatere7
- Value
- 75%e7
- Qualifier
- by masse7
- Comparator
- MiniMaxe7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean cultivar”
e7“Seeds of Fiskeby were 75% greater by mass than those of MiniMax”
Claim · model-written summary
Elevated CO2 left root growth, seed size and seeds per pod of MiniMax unaffected.
- Taxon
- soybeanGlycine maxt0
- Material
- MiniMaxe1
- Treatment
- CO 2 enrichmente1
- Outcome
- Root growth, seed size, seeds per pode1
- Direction
- unaffectede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean cultivar”
e1“Root growth, seed size, seeds per pod and starch accumulation rates for MiniMax were unaffected by CO 2 enrichment”
Claim · model-written summary
Elevated CO2 left starch accumulation rates of MiniMax unaffected.
- Taxon
- soybeanGlycine maxt0
- Material
- MiniMaxe1
- Treatment
- CO 2 enrichmente1
- Outcome
- starch accumulation ratese1
- Direction
- unaffectede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean cultivar”
e1“Root growth, seed size, seeds per pod and starch accumulation rates for MiniMax were unaffected by CO 2 enrichment”
Claim · model-written summary
Growth of the dwarf genotype under elevated CO2 appears to be sink limited.
- Taxon
- soybeanGlycine maxt0
- Material
- dwarf genotypee1
- Treatment
- elevated CO 2e1
- Outcome
- growth of the dwarf genotypee1
- Qualifier
- sink limitede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean cultivar”
e1“The above findings suggested that growth of the dwarf genotype under elevated CO 2 was sink limited”
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