Abstract
Increases in growth at elevated [CO2] may be constrained by a plant's ability to assimilate the nutrients needed for new tissue in sufficient quantity to match the increase in carbon fixation and/or the ability to transport those nutrients and carbon in sufficient quantity to growing organs and tissues. Analysis of metabolites provides an indication of shifts in carbon and nitrogen partitioning due to rising atmospheric [CO2] and can help identify where bottlenecks in carbon utilization occur. In this study, the carbon and nitrogen balance was investigated in growing and fully expanded soybean leaves exposed to elevated [CO2] in a free air CO2 enrichment experiment. Diurnal photosynthesis and diurnal profiles of carbon and nitrogen metabolites were measured during two different crop growth stages. Diurnal carbon gain was increased by c. 20% in elevated [CO2] in fully expanded leaves, which led to significant increases in leaf hexose, sucrose, and starch contents. However, there was no detectable difference in nitrogen-rich amino acids and ureides in mature leaves. By contrast to mature leaves, developing leaves had high concentrations of ureides and amino acids relative to low concentrations of carbohydrates. Developing leaves at elevated [CO2] had smaller pools of ureides compared with developing leaves at ambient [CO2], which suggests N assimilation in young leaves was improved by elevated [CO2]. This work shows that elevated [CO2] alters the balance of carbon and nitrogen pools in both mature and growing soybean leaves, which could have down-stream impacts on growth and productivity.
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Claims 6
Claim · model-written summary
Diurnal carbon gain increased by about 20% in fully expanded soybean leaves under elevated CO2.
- Taxon
- soybean
Glycine maxt0 - Organ / stage
- fully expanded leavese0
- Treatment
- elevated [CO2]e0
- Outcome
- Diurnal carbon gaine0
- Direction
- increasede0
- Value
- c. 20%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Diurnal carbon gain was increased by c. 20% in elevated [CO2] in fully expanded leaves”
t0“soybean”
Claim · model-written summary
Elevated CO2 led to significant increases in leaf hexose, sucrose and starch contents in fully expanded soybean leaves.
- Taxon
- soybeanGlycine maxt0
- Organ / stage
- fully expanded leavese0
- Treatment
- elevated [CO2]e0
- Outcome
- leaf hexose, sucrose, and starch contentse0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Diurnal carbon gain was increased by c. 20% in elevated [CO2] in fully expanded leaves, which led to significant increases in leaf hexose, sucrose, and starch contents”
t0“soybean”
Claim · model-written summary
No detectable difference was found in nitrogen-rich amino acids and ureides in mature soybean leaves under elevated CO2.
- Taxon
- soybeanGlycine maxt0
- Organ / stage
- mature leavese0
- Outcome
- nitrogen-rich amino acids and ureidese0
- Direction
- no detectable differencee0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was no detectable difference in nitrogen-rich amino acids and ureides in mature leaves”
t0“soybean”
Claim · model-written summary
Developing soybean leaves had high concentrations of ureides and amino acids relative to low concentrations of carbohydrates, in contrast to mature leaves.
- Taxon
- soybeanGlycine maxt0
- Organ / stage
- developing leavese0
- Outcome
- concentrations of ureides and amino acidse0
- Direction
- highe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“developing leaves had high concentrations of ureides and amino acids relative to low concentrations of carbohydrates”
t0“soybean”
Claim · model-written summary
Developing soybean leaves at elevated CO2 had smaller pools of ureides than developing leaves at ambient CO2.
- Taxon
- soybeanGlycine maxt0
- Organ / stage
- Developing leavese0
- Treatment
- elevated [CO2]e0
- Outcome
- pools of ureidese0
- Direction
- smallere0
- Comparator
- ambient [CO2]e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Developing leaves at elevated [CO2] had smaller pools of ureides compared with developing leaves at ambient [CO2]”
t0“soybean”
Claim · model-written summary
The authors suggest that nitrogen assimilation in young leaves was improved by elevated CO2.
- Taxon
- soybeanGlycine maxt0
- Organ / stage
- young leavese0
- Treatment
- elevated [CO2]e0
- Outcome
- N assimilatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“which suggests N assimilation in young leaves was improved by elevated [CO2]”
t0“soybean”
The same questions in other papers
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- no effect
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See all 18 papers →co2 · molecular: metabolites · Glycine max (soybean)Positive and negative results
14 papers in the same direction as this paper · 7 in the opposite direction · 1 reporting no difference from an alternative
- negative
- positive
- positive
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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.