Abstract
Understanding of the influences of root-zone CO2 concentration on nitrogen (N) metabolism is limited. The influences of root-zone CO2 concentration on growth, N uptake, N metabolism and the partitioning of root assimilated 14C were determined in tomato (Lycopersicon esculentum). Root, but not leaf, nitrate reductase activity was increased in plants supplied with increased root-zone CO2. Root phosphoenolpyruvate carboxylase activity was lower with NO3(-)- than with NH4(+)-nutrition, and in the latter, was also suppressed by increased root-zone CO2. Increased growth rate in NO3(-)-fed plants with elevated root-zone CO2 concentrations was associated with transfer of root-derived organic acids to the shoot and conversion to carbohydrates. With NH4(+)-fed plants, growth and total N were not altered by elevated root-zone CO2 concentrations, although 14C partitioning to amino acid synthesis was increased. Effects of root-zone CO2 concentration on N uptake and metabolism over longer periods (> 1 d) were probably limited by feedback inhibition. Root-derived organic acids contributed to the carbon budget of the leaves through decarboxylation of the organic acids and photosynthetic refixation of released CO2.
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Claims 8
Claim · model-written summary
Elevated root-zone CO2 increased root nitrate reductase activity in tomato, whereas leaf nitrate reductase activity was not increased.
- Taxon
- tomato (Lycopersicon esculentum)
Solanum lycopersicume2 - Organ / stage
- Roote3
- Treatment
- increased root-zone CO2e3
- Outcome
- nitrate reductase activitye3
- Direction
- increasede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“were determined in tomato (Lycopersicon esculentum)”
e3“Root, but not leaf, nitrate reductase activity was increased in plants supplied with increased root-zone CO2”
Claim · model-written summary
With NO3(-)- nutrition, root phosphoenolpyruvate carboxylase activity was lower than with NH4(+)-nutrition in tomato.
- Taxon
- tomato (Lycopersicon esculentum)Solanum lycopersicume2
- Organ / stage
- Roote4
- Treatment
- NO3(-)-e4
- Outcome
- phosphoenolpyruvate carboxylase activitye4
- Direction
- lowere4
- Comparator
- NH4(+)-nutritione4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“were determined in tomato (Lycopersicon esculentum)”
e4“Root phosphoenolpyruvate carboxylase activity was lower with NO3(-)- than with NH4(+)-nutrition, and in the latter, was also suppressed by increased root-zone CO2”
Claim · model-written summary
In NH4(+)-supplied tomato plants, increased root-zone CO2 suppressed root phosphoenolpyruvate carboxylase activity.
- Taxon
- tomato (Lycopersicon esculentum)Solanum lycopersicume2
- Organ / stage
- Roote4
- Treatment
- increased root-zone CO2e4
- Outcome
- phosphoenolpyruvate carboxylase activitye4
- Direction
- suppressede4
- Qualifier
- NH4(+)-nutritione4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“were determined in tomato (Lycopersicon esculentum)”
e4“Root phosphoenolpyruvate carboxylase activity was lower with NO3(-)- than with NH4(+)-nutrition, and in the latter, was also suppressed by increased root-zone CO2”
Claim · model-written summary
With NH4(+)-fed tomato plants, elevated root-zone CO2 did not alter growth or total N.
- Taxon
- tomato (Lycopersicon esculentum)Solanum lycopersicume2
- Treatment
- elevated root-zone CO2 concentrationse5
- Outcome
- growth and total Ne5
- Direction
- not alterede5
- Qualifier
- NH4(+)-fed plantse5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“were determined in tomato (Lycopersicon esculentum)”
e5“With NH4(+)-fed plants, growth and total N were not altered by elevated root-zone CO2 concentrations, although 14C partitioning to amino acid synthesis was increased”
Claim · model-written summary
In NH4(+)-fed tomato plants, 14C partitioning to amino acid synthesis was increased.
- Taxon
- tomato (Lycopersicon esculentum)Solanum lycopersicume2
- Outcome
- 14C partitioning to amino acid synthesise5
- Direction
- increasede5
- Qualifier
- NH4(+)-fed plantse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“were determined in tomato (Lycopersicon esculentum)”
e5“With NH4(+)-fed plants, growth and total N were not altered by elevated root-zone CO2 concentrations, although 14C partitioning to amino acid synthesis was increased”
Claim · model-written summary
Effects of root-zone CO2 on N uptake and metabolism over periods longer than 1 d were probably limited by feedback inhibition.
- Taxon
- tomato (Lycopersicon esculentum)Solanum lycopersicume2
- Treatment
- root-zone CO2 concentratione6
- Outcome
- N uptake and metabolisme6
- Qualifier
- feedback inhibitione6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“were determined in tomato (Lycopersicon esculentum)”
e6“Effects of root-zone CO2 concentration on N uptake and metabolism over longer periods (> 1 d) were probably limited by feedback inhibition”
Claim · model-written summary
Root-derived organic acids contributed to the leaf carbon budget in tomato through decarboxylation and photosynthetic refixation of released CO2.
- Taxon
- tomato (Lycopersicon esculentum)Solanum lycopersicume2
- Compound
- organic acidse7
- Outcome
- carbon budget of the leavese7
- Qualifier
- decarboxylation of the organic acids and photosynthetic refixation of released CO2e7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“were determined in tomato (Lycopersicon esculentum)”
e7“Root-derived organic acids contributed to the carbon budget of the leaves through decarboxylation of the organic acids and photosynthetic refixation of released CO2”
Claim · model-written summary
Growth rate increased in NO3(-)-fed tomato plants under elevated root-zone CO2, and this was associated with transfer of root-derived organic acids to the shoot.
- Taxon
- tomato (Lycopersicon esculentum)Solanum lycopersicume2
- Treatment
- elevated root-zone CO2 concentrationse7
- Outcome
- growth ratee7
- Direction
- Increasede7
- Qualifier
- NO3(-)-fed plantse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“were determined in tomato (Lycopersicon esculentum)”
e7“Increased growth rate in NO3(-)-fed plants with elevated root-zone CO2 concentrations was associated with transfer of root-derived organic acids to the shoot and conversion to carbohydrates”
The same questions in other papers
co2 · growth · Solanum lycopersicum (tomato)Positive and negative results
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