Abstract
Spring wheat (Triticum aestivum cv. Hanno) was grown at ambient (350 micromol mol(-1)) or elevated CO(2) (700 micromol mol(-1)) in charcoal/Purafil-filtered air (CFA <5 nmol mol(-1)) or ozone (CFA +75 nmol mol(-1) 7 h d(-1)) at three levels of N supply (1.5, 4 and 14 mM NO(-3)), to test the hypothesis that the combined impacts of elevated CO(2) and O(3) on plant growth and photosynthetic capacity are affected by nitrogen availability. Shifts in foliar N content reflected the level of N supplied, and the growth stimulation induced by elevated CO(2) was dependent on the level of N supply. At 60 d after transfer (DAT), elevated CO(2) was found to increase total biomass by 44%, 29%, 12% in plants supplied with 14, 4 and 1.5 mM NO(-3), respectively, and there was no evidence of photosynthetic acclimation to elevated CO(2) across N treatments; the maximum in vivo rate of Rubisco carboxylation (V(cmax)) was similar in plants raised at elevated and ambient CO(2). At 60 DAT, ozone exposure was found to suppress plant relative growth rate (RGR) and net photosynthesis (A) in plants supplied with 14 and 4 mM NO(-3). However, O(3) had no effect on the RGR of plants supplied with 1.5 mM NO(-3) and this effect was accompanied by a reduced impact of the pollutant on A. Elevated CO(2) counteracted the detrimental effects of O(3) (i.e. the same ozone concentration that depressed RGR and A at ambient CO(2) resulted in no significant effects when plants were raised at elevated CO(2)) at all levels of N supply and the effect was associated with a decline in O(3) uptake at the leaf level.
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Claims 11
Claim · model-written summary
Elevated CO2 increased total biomass of wheat by 44% at 14 mM NO3 supply.
- Taxon
- Triticum aestivum
Triticum aestivume0 - Treatment
- elevated CO(2)e2
- Outcome
- total biomasse2
- Direction
- increasee2
- Value
- 44%e2
- Qualifier
- plants supplied with 14, 4 and 1.5 mM NO(-3), respectivelye2
- Comparator
- ambient CO(2)e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Spring wheat (Triticum aestivum cv. Hanno) was grown at ambient”
e2“At 60 d after transfer (DAT), elevated CO(2) was found to increase total biomass by 44%, 29%, 12% in plants supplied with 14, 4 and 1.5 mM NO(-3), respectively, and there was no evidence of photosynthetic acclimation to elevated CO(2) across N treatments; the maximum in vivo rate of Rubisco carboxylation (V(cmax)) was similar in plants raised at elevated and ambient CO(2)”
Claim · model-written summary
Elevated CO2 increased total biomass of wheat by 29% at 4 mM NO3 supply.
- Taxon
- Triticum aestivumTriticum aestivume0
- Treatment
- elevated CO(2)e2
- Outcome
- total biomasse2
- Direction
- increasee2
- Value
- 29%e2
- Qualifier
- plants supplied with 14, 4 and 1.5 mM NO(-3), respectivelye2
- Comparator
- ambient CO(2)e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Spring wheat (Triticum aestivum cv. Hanno) was grown at ambient”
e2“At 60 d after transfer (DAT), elevated CO(2) was found to increase total biomass by 44%, 29%, 12% in plants supplied with 14, 4 and 1.5 mM NO(-3), respectively, and there was no evidence of photosynthetic acclimation to elevated CO(2) across N treatments; the maximum in vivo rate of Rubisco carboxylation (V(cmax)) was similar in plants raised at elevated and ambient CO(2)”
Claim · model-written summary
Elevated CO2 increased total biomass of wheat by 12% at 1.5 mM NO3 supply.
- Taxon
- Triticum aestivumTriticum aestivume0
- Treatment
- elevated CO(2)e2
- Outcome
- total biomasse2
- Direction
- increasee2
- Value
- 12%e2
- Qualifier
- plants supplied with 14, 4 and 1.5 mM NO(-3), respectivelye2
- Comparator
- ambient CO(2)e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Spring wheat (Triticum aestivum cv. Hanno) was grown at ambient”
e2“At 60 d after transfer (DAT), elevated CO(2) was found to increase total biomass by 44%, 29%, 12% in plants supplied with 14, 4 and 1.5 mM NO(-3), respectively, and there was no evidence of photosynthetic acclimation to elevated CO(2) across N treatments; the maximum in vivo rate of Rubisco carboxylation (V(cmax)) was similar in plants raised at elevated and ambient CO(2)”
Claim · model-written summary
Elevated CO2 did not acclimate wheat photosynthesis: maximum Rubisco carboxylation rate was similar to ambient CO2 across N treatments.
- Taxon
- Triticum aestivumTriticum aestivume0
- Treatment
- elevated CO(2)e2
- Outcome
- maximum in vivo rate of Rubisco carboxylation (V(cmax))e2
- Direction
- similare2
- Qualifier
- no evidence of photosynthetic acclimatione2
- Comparator
- ambient CO(2)e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Spring wheat (Triticum aestivum cv. Hanno) was grown at ambient”
e2“At 60 d after transfer (DAT), elevated CO(2) was found to increase total biomass by 44%, 29%, 12% in plants supplied with 14, 4 and 1.5 mM NO(-3), respectively, and there was no evidence of photosynthetic acclimation to elevated CO(2) across N treatments; the maximum in vivo rate of Rubisco carboxylation (V(cmax)) was similar in plants raised at elevated and ambient CO(2)”
Claim · model-written summary
Foliar N content of wheat shifted with the level of N supplied.
- Taxon
- Triticum aestivumTriticum aestivume0
- Outcome
- foliar N contente1
- Qualifier
- reflected the level of N suppliede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Spring wheat (Triticum aestivum cv. Hanno) was grown at ambient”
e1“Shifts in foliar N content reflected the level of N supplied, and the growth stimulation induced by elevated CO(2) was dependent on the level of N supply”
Claim · model-written summary
The growth stimulation of wheat induced by elevated CO2 depended on the level of N supply.
- Taxon
- Triticum aestivumTriticum aestivume0
- Treatment
- elevated CO(2)e1
- Outcome
- growth stimulation induced by elevated CO(2)e1
- Qualifier
- was dependent on the level of N supplye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Spring wheat (Triticum aestivum cv. Hanno) was grown at ambient”
e1“Shifts in foliar N content reflected the level of N supplied, and the growth stimulation induced by elevated CO(2) was dependent on the level of N supply”
Claim · model-written summary
Ozone exposure suppressed relative growth rate and net photosynthesis of wheat at 14 and 4 mM NO3 supply.
- Taxon
- Triticum aestivumTriticum aestivume0
- Treatment
- ozone exposuree3
- Outcome
- plant relative growth rate (RGR) and net photosynthesis (A)e3
- Direction
- suppresse3
- Qualifier
- in plants supplied with 14 and 4 mM NO(-3)e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Spring wheat (Triticum aestivum cv. Hanno) was grown at ambient”
e3“At 60 DAT, ozone exposure was found to suppress plant relative growth rate (RGR) and net photosynthesis (A) in plants supplied with 14 and 4 mM NO(-3)”
Claim · model-written summary
Ozone had no effect on relative growth rate of wheat at 1.5 mM NO3 supply.
- Taxon
- Triticum aestivumTriticum aestivume0
- Treatment
- O(3)e4
- Outcome
- RGRe4
- Direction
- no effecte4
- Qualifier
- plants supplied with 1.5 mM NO(-3)e4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Spring wheat (Triticum aestivum cv. Hanno) was grown at ambient”
e4“However, O(3) had no effect on the RGR of plants supplied with 1.5 mM NO(-3) and this effect was accompanied by a reduced impact of the pollutant on A”
Claim · model-written summary
At 1.5 mM NO3 supply, ozone had a reduced impact on net photosynthesis of wheat.
- Taxon
- Triticum aestivumTriticum aestivume0
- Treatment
- O(3)e4
- Outcome
- impact of the pollutant on Ae4
- Direction
- reducede4
- Qualifier
- plants supplied with 1.5 mM NO(-3)e4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Spring wheat (Triticum aestivum cv. Hanno) was grown at ambient”
e4“However, O(3) had no effect on the RGR of plants supplied with 1.5 mM NO(-3) and this effect was accompanied by a reduced impact of the pollutant on A”
Claim · model-written summary
Elevated CO2 counteracted the detrimental effects of ozone on wheat at all levels of N supply.
- Taxon
- Triticum aestivumTriticum aestivume0
- Treatment
- Elevated CO(2)e5
- Outcome
- detrimental effects of O(3)e5
- Direction
- counteractede5
- Qualifier
- at all levels of N supplye5
- Comparator
- ambient CO(2)e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Spring wheat (Triticum aestivum cv. Hanno) was grown at ambient”
e5“Elevated CO(2) counteracted the detrimental effects of O(3) (i.e. the same ozone concentration that depressed RGR and A at ambient CO(2) resulted in no significant effects when plants were raised at elevated CO(2)) at all levels of N supply and the effect was associated with a decline in O(3) uptake at the leaf level”
Claim · model-written summary
The counteraction of ozone effects by elevated CO2 was associated with a decline in ozone uptake at the leaf level in wheat.
- Taxon
- Triticum aestivumTriticum aestivume0
- Treatment
- Elevated CO(2)e5
- Outcome
- O(3) uptakee5
- Direction
- declinee5
- Qualifier
- at the leaf levele5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Spring wheat (Triticum aestivum cv. Hanno) was grown at ambient”
e5“Elevated CO(2) counteracted the detrimental effects of O(3) (i.e. the same ozone concentration that depressed RGR and A at ambient CO(2) resulted in no significant effects when plants were raised at elevated CO(2)) at all levels of N supply and the effect was associated with a decline in O(3) uptake at the leaf level”
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See all 145 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.