Abstract
The effect of elevated CO2 concentrations on the levels of secondary metabolites was investigated in tobacco plants grown under two nitrogen supply (5 and 8 mM NH4NO3) and CO2 conditions (350 and 1000 p.p.m.) each. High CO2 resulted in a dramatic increase of phenylpropanoids in the leaves, including the major carbon-rich compound chlorogenic acid (CGA) and the coumarins scopolin and scopoletin at both nitrogen fertilizations. This was accompanied by increased PAL activity in leaves and roots, which was even higher at the lower nitrogen supply. Hardly any change was observed for the structural phenolic polymer lignin and the sesquiterpenoid capsidiol. In contrast, elevated CO2 led to clearly decreased levels of the main nitrogen-rich constituent nicotine at the lower N-supply (5 mM NH4NO3) but not when plants were grown at the higher N-supply (8 mM NH4NO3). Inoculation experiments with potato virus Y (PVY) were used to evaluate possible ecological consequences of elevated CO2. The titre of viral coat-protein was markedly reduced in leaves under these conditions at both nitrogen levels. Since PR-gene expression and free salicylic acid (SA) levels remained unchanged at elevated CO2, we suggest that the accumulation of phenylpropanoids, for example, the major compound CGA and the coumarins scopolin and scopoletin may result in an earlier confinement of the virus at high CO2. Based on our results two final conclusions emerge. First, elevated CO2 leads to a shift in secondary metabolite composition that is dependent on the availability of nitrogen. Second, changes in the pool of secondary metabolites have important consequences for plant-pathogen interactions as shown for PVY as a test organism.
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Claims 8
Claim · model-written summary
Elevated CO2 increased phenylpropanoids in tobacco leaves at both nitrogen supply levels.
- Taxon
- tobacco
Nicotiana tabacumt0 - Organ / stage
- leavese1
- Treatment
- High CO2e1
- Outcome
- phenylpropanoidse1
- Direction
- increasee1
- Qualifier
- at both nitrogen fertilizationse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Growth at elevated CO2 concentrations leads to modified profiles of secondary metabolites in tobacco cv. SamsunNN”
e1“High CO2 resulted in a dramatic increase of phenylpropanoids in the leaves, including the major carbon-rich compound chlorogenic acid (CGA) and the coumarins scopolin and scopoletin at both nitrogen fertilizations”
Claim · model-written summary
Elevated CO2 increased PAL activity in tobacco leaves and roots, and the increase was even higher at the lower nitrogen supply.
- Taxon
- tobaccoNicotiana tabacumt0
- Organ / stage
- leaves and rootse2
- Treatment
- elevated CO2t0
- Gene
- PALe2
- Outcome
- PAL activitye2
- Direction
- increasede2
- Qualifier
- even higher at the lower nitrogen supplye2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Growth at elevated CO2 concentrations leads to modified profiles of secondary metabolites in tobacco cv. SamsunNN”
e2“This was accompanied by increased PAL activity in leaves and roots, which was even higher at the lower nitrogen supply”
Claim · model-written summary
Elevated CO2 decreased nicotine levels in tobacco at the lower nitrogen supply (5 mM NH4NO3).
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- elevated CO2t0
- Outcome
- levels of the main nitrogen-rich constituent nicotinee3
- Direction
- decreasede3
- Qualifier
- at the lower N-supply (5 mM NH4NO3)e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Growth at elevated CO2 concentrations leads to modified profiles of secondary metabolites in tobacco cv. SamsunNN”
e3“elevated CO2 led to clearly decreased levels of the main nitrogen-rich constituent nicotine at the lower N-supply (5 mM NH4NO3) but not when plants were grown at the higher N-supply (8 mM NH4NO3)”
Claim · model-written summary
Elevated CO2 did not change nicotine levels in tobacco at the higher nitrogen supply (8 mM NH4NO3).
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- elevated CO2t0
- Outcome
- levels of the main nitrogen-rich constituent nicotinee3
- Direction
- no_changeinferrede3
- Qualifier
- at the higher N-supply (8 mM NH4NO3)e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Growth at elevated CO2 concentrations leads to modified profiles of secondary metabolites in tobacco cv. SamsunNN”
e3“elevated CO2 led to clearly decreased levels of the main nitrogen-rich constituent nicotine at the lower N-supply (5 mM NH4NO3) but not when plants were grown at the higher N-supply (8 mM NH4NO3)”
Claim · model-written summary
Elevated CO2 reduced the titre of potato virus Y coat protein in tobacco leaves at both nitrogen levels.
- Taxon
- tobaccoNicotiana tabacumt0
- Organ / stage
- leavese4
- Treatment
- elevated CO2e5
- Interactor
- potato virus Y
Potato virus Ye5pathogen - Outcome
- titre of viral coat-proteine4
- Direction
- reducede4
- Qualifier
- at both nitrogen levelse4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Growth at elevated CO2 concentrations leads to modified profiles of secondary metabolites in tobacco cv. SamsunNN”
e4“The titre of viral coat-protein was markedly reduced in leaves under these conditions at both nitrogen levels”
e5“Inoculation experiments with potato virus Y (PVY) were used to evaluate possible ecological consequences of elevated CO2”
Claim · model-written summary
Elevated CO2 left PR-gene expression and free salicylic acid levels in tobacco unchanged.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- elevated CO2t0
- Gene
- PR-genee6
- Outcome
- PR-gene expression and free salicylic acid (SA) levelse6
- Direction
- unchangede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Growth at elevated CO2 concentrations leads to modified profiles of secondary metabolites in tobacco cv. SamsunNN”
e6“Since PR-gene expression and free salicylic acid (SA) levels remained unchanged at elevated CO2”
Claim · model-written summary
The accumulation of phenylpropanoids may explain an earlier confinement of potato virus Y in tobacco at high CO2.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- high CO2e7
- Interactor
- viruse7pathogen
- Compound
- phenylpropanoidse7
- Outcome
- earlier confinement of the viruse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Growth at elevated CO2 concentrations leads to modified profiles of secondary metabolites in tobacco cv. SamsunNN”
e7“we suggest that the accumulation of phenylpropanoids, for example, the major compound CGA and the coumarins scopolin and scopoletin may result in an earlier confinement of the virus at high CO2”
Claim · model-written summary
Elevated CO2 hardly changed the lignin and capsidiol levels of tobacco.
- Taxon
- tobaccoNicotiana tabacumt0
- Treatment
- elevated CO2t0
- Outcome
- structural phenolic polymer lignin and the sesquiterpenoid capsidiole0
- Direction
- no_changeinferrede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Growth at elevated CO2 concentrations leads to modified profiles of secondary metabolites in tobacco cv. SamsunNN”
e0“Hardly any change was observed for the structural phenolic polymer lignin and the sesquiterpenoid capsidiol”
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See all 5 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.