Abstract
Anthropogenic increase of atmospheric CO2 concentration is likely to affect plant growth in natural and agricultural ecosystems. Since nitrogen (N) is one of the major factors limiting agricultural plant production, we investigated the effect of elevated atmospheric CO2 concentration on N partitioning at the whole-plant level and the cellular level at limited N supply. Tobacco was grown at ambient (400 ppm) and elevated (800 ppm) concentrations of atmospheric CO2 under conditions of defined N supply with the same amount of N supplied to all plants, independent of CO2-induced changes of the actual growth rate. Under conditions of N deficiency, high CO2 concentration promoted root growth whereas shoot growth was only slightly increased, which resulted in an increased root/shoot ratio. At low N supply, elevated atmospheric CO2 concentration decreased N concentrations in the shoot tissue, but not in roots. Obviously elevated CO2 supply stimulated N partitioning into roots relative to the shoots, which coincided with relatively stronger root growth. At the cellular level, Rubisco (ribulose-1,5-bisphosphate carboxylase-oxygenase) protein decreased under N deficiency and elevated CO2. This was associated with increasing starch concentrations, while sugar concentrations were not affected. We suggest that root growth under N limitation is restricted by the internal N availability rather than by other factors such as carbon supply. The present results suggest that N partitioning into roots is favored by elevated CO2 supply due to a decreased N demand of the shoot.
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Claims 11
Claim · model-written summary
High CO2 promoted root growth under nitrogen deficiency.
- Taxon
- TOBACCO PLANTS
Nicotiana tabacumt0 - Treatment
- high CO2 concentratione0
- Outcome
- root growthe0
- Direction
- promotede0
- Qualifier
- Under conditions of N deficiencye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under conditions of N deficiency, high CO2 concentration promoted root growth whereas shoot growth was only slightly increased”
t0“TOBACCO PLANTS”
Claim · model-written summary
High CO2 slightly increased shoot growth under nitrogen deficiency.
- Taxon
- TOBACCO PLANTSNicotiana tabacumt0
- Treatment
- high CO2 concentratione0
- Outcome
- shoot growthe0
- Direction
- increasede0
- Qualifier
- only slightlye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high CO2 concentration promoted root growth whereas shoot growth was only slightly increased”
t0“TOBACCO PLANTS”
Claim · model-written summary
High CO2 increased the root/shoot ratio.
- Taxon
- TOBACCO PLANTSNicotiana tabacumt0
- Treatment
- high CO2 concentratione0
- Outcome
- root/shoot ratioe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high CO2 concentration promoted root growth whereas shoot growth was only slightly increased, which resulted in an increased root/shoot ratio”
t0“TOBACCO PLANTS”
Claim · model-written summary
Elevated CO2 decreased shoot nitrogen concentration at low nitrogen supply.
- Taxon
- TOBACCO PLANTSNicotiana tabacumt0
- Treatment
- elevated atmospheric CO2 concentratione0
- Outcome
- N concentrations in the shoot tissuee0
- Direction
- decreasede0
- Qualifier
- At low N supplye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At low N supply, elevated atmospheric CO2 concentration decreased N concentrations in the shoot tissue”
t0“TOBACCO PLANTS”
Claim · model-written summary
Elevated CO2 did not decrease root nitrogen concentration at low nitrogen supply.
- Taxon
- TOBACCO PLANTSNicotiana tabacumt0
- Treatment
- elevated atmospheric CO2 concentratione0
- Outcome
- N concentrations in the shoot tissue, but not in rootse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“elevated atmospheric CO2 concentration decreased N concentrations in the shoot tissue, but not in roots”
t0“TOBACCO PLANTS”
Claim · model-written summary
Elevated CO2 favored nitrogen partitioning into roots relative to shoots.
- Taxon
- TOBACCO PLANTSNicotiana tabacumt0
- Treatment
- elevated CO2 supplye0
- Outcome
- N partitioning into rootse0
- Direction
- stimulatede0
- Comparator
- the shootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“elevated CO2 supply stimulated N partitioning into roots relative to the shoots”
t0“TOBACCO PLANTS”
Claim · model-written summary
Rubisco protein decreased under nitrogen deficiency and elevated CO2.
- Taxon
- TOBACCO PLANTSNicotiana tabacumt0
- Treatment
- N deficiency and elevated CO2e0
- Gene
- Rubiscoe0
- Outcome
- Rubisco (ribulose-1,5-bisphosphate carboxylase-oxygenase) proteine0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rubisco (ribulose-1,5-bisphosphate carboxylase-oxygenase) protein decreased under N deficiency and elevated CO2”
t0“TOBACCO PLANTS”
Claim · model-written summary
Starch concentration increased alongside the decline in Rubisco protein.
- Taxon
- TOBACCO PLANTSNicotiana tabacumt0
- Treatment
- Thise0
- Outcome
- starch concentrationse0
- Direction
- increasinge0
Not reportedGene
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This was associated with increasing starch concentrations”
t0“TOBACCO PLANTS”
Claim · model-written summary
Sugar concentrations were unaffected.
- Taxon
- TOBACCO PLANTSNicotiana tabacumt0
- Outcome
- sugar concentrationse0
- Direction
- not affectede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while sugar concentrations were not affected”
t0“TOBACCO PLANTS”
Claim · model-written summary
The authors suggest that internal nitrogen availability restricts root growth under nitrogen limitation.
- Taxon
- TOBACCO PLANTSNicotiana tabacumt0
- Outcome
- root growthe0
- Direction
- restrictede0
- Qualifier
- internal N availabilitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root growth under N limitation is restricted by the internal N availability rather than by other factors such as carbon supply”
t0“TOBACCO PLANTS”
Claim · model-written summary
The authors attribute favored root nitrogen partitioning under elevated CO2 to lower shoot nitrogen demand.
- Taxon
- TOBACCO PLANTSNicotiana tabacumt0
- Treatment
- elevated CO2 supplye0
- Outcome
- N partitioning into rootse0
- Direction
- favorede0
- Qualifier
- decreased N demand of the shoote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N partitioning into roots is favored by elevated CO2 supply due to a decreased N demand of the shoot”
t0“TOBACCO PLANTS”
The same questions in other papers
co2 · nutrient: content · Nicotiana tabacum (tobacco)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- negative
- positive
co2 · growth · Nicotiana tabacum (tobacco)Positive and negative results
11 papers in the same direction as this paper · 6 in the opposite direction
- positive
- positive
- negative
14 papers more in this group
See all 18 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.