Abstract
The short‐term and long‐term effects of CO, enrichment on certain aspects of photosynthesis and leaf carbohydrate metabolism were studied with soybean [Glycine max (L.) Merr.] plants. In general, both long‐term and short‐term CO 2 enrichment (300 ppm CO 2 above ambient) of soybean plants resulted in increased rates of photosynthesis (per unit leaf area) and starch accumulation. Leaf sucrose concentrations were increased slightly, but the rate of assimilate export and activity of sucrose phosphate synthase (EC 2.4.1.14) were usually not increased. Plant N‐status affected the response of vegetative soybean ‘Ransom’ plants to short‐term CO, enrichment. When plants were N‐stressed (2 m M NO 3 ‐ supplied), CO 2 enrichment resulted in increased rates of both starch accumulation and export. As N‐supply was increased, partitioning of carbon into starch in CO 2 ‐enriched atmospheres increased at the expense of assimilate export. When plants were grown with high‐N (20 m M NO 3 ), the rate of assimilate export from CO 2 ‐enriched leaves was reduced below the rate observed with plants maintained at ambient CO 2 . The reduction in export rate was associated with decreased activities of sucrose phosphate synthase in leaf extracts. The activity of sucrose phosphate synthase in leaf extracts was closely associated with partitioning of carbon between starch and sucrose in leaves, and with the rate of assimilate export.
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Claims 8
Claim · model-written summary
CO2 enrichment increased photosynthesis and starch accumulation.
- Taxon
- soybean
Glycine maxe0 - Treatment
- CO 2 enrichment (300 ppm CO 2 above ambient)e0
- Outcome
- photosynthesis (per unit leaf area) and starch accumulatione0
- Direction
- increasede0
- Comparator
- ambiente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both long‐term and short‐term CO 2 enrichment (300 ppm CO 2 above ambient) of soybean plants resulted in increased rates of photosynthesis (per unit leaf area) and starch accumulation”
Claim · model-written summary
Leaf sucrose concentrations increased slightly under CO2 enrichment.
- Taxon
- soybeanGlycine maxe1
- Treatment
- CO2 enrichmente1
- Outcome
- Leaf sucrose concentrationse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf sucrose concentrations were increased slightly”
e1“Effects of CO2 enrichment on photosynthesis and photosynthate partitioning in soybean (Glycine max) leaves”
Claim · model-written summary
Assimilate export and sucrose phosphate synthase activity usually did not increase.
- Taxon
- soybeanGlycine maxt0
- Outcome
- rate of assimilate export and activity of sucrose phosphate synthasee0
- Direction
- not increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the rate of assimilate export and activity of sucrose phosphate synthase (EC 2.4.1.14) were usually not increased”
t0“soybean (Glycine max)”
Claim · model-written summary
With N stress, CO2 enrichment increased starch accumulation and export.
- Taxon
- soybeanGlycine maxt0
- Treatment
- CO 2 enrichmente0
- Outcome
- starch accumulation and exporte0
- Direction
- increasede0
- Qualifier
- N‐stressed (2 m M NO 3 ‐ supplied)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When plants were N‐stressed (2 m M NO 3 ‐ supplied), CO 2 enrichment resulted in increased rates of both starch accumulation and export”
t0“soybean (Glycine max)”
Claim · model-written summary
As N supply increased under enriched CO2, more carbon partitioned into starch at the expense of export.
- Taxon
- soybeanGlycine maxt0
- Treatment
- N‐supplye0
- Outcome
- partitioning of carbon into starche0
- Direction
- increasede0
- Qualifier
- at the expense of assimilate exporte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“As N‐supply was increased, partitioning of carbon into starch in CO 2 ‐enriched atmospheres increased at the expense of assimilate export”
t0“soybean (Glycine max)”
Claim · model-written summary
At high N, assimilate export from enriched leaves was below ambient CO2 plants.
- Taxon
- soybeanGlycine maxt0
- Treatment
- CO 2 ‐enrichede0
- Outcome
- rate of assimilate exporte0
- Direction
- reducede0
- Qualifier
- high‐N (20 m M NO 3 )e0
- Comparator
- ambient CO 2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When plants were grown with high‐N (20 m M NO 3 ), the rate of assimilate export from CO 2 ‐enriched leaves was reduced below the rate observed with plants maintained at ambient CO 2”
t0“soybean (Glycine max)”
Claim · model-written summary
Reduced export was associated with lower sucrose phosphate synthase activity.
- Taxon
- soybeanGlycine maxt0
- Gene
- sucrose phosphate synthasee0
- Outcome
- activities of sucrose phosphate synthasee0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The reduction in export rate was associated with decreased activities of sucrose phosphate synthase in leaf extracts”
t0“soybean (Glycine max)”
Claim · model-written summary
Sucrose phosphate synthase activity was closely associated with starch versus sucrose partitioning and export rate.
- Taxon
- soybeanGlycine maxt0
- Gene
- sucrose phosphate synthasee0
- Outcome
- partitioning of carbon between starch and sucrose in leaves, and with the rate of assimilate exporte0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activity of sucrose phosphate synthase in leaf extracts was closely associated with partitioning of carbon between starch and sucrose in leaves, and with the rate of assimilate export”
t0“soybean (Glycine max)”
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See all 23 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.