Abstract
To study the relationship between growth, lignification, and peroxidase (POD) activity, we grew tobacco (Nicotiana tabacum var. Xanthi) control and transgenic plants, repressed in the anionic apoplastic POD by antisense transformation, under ambient and elevated CO2. It was expected that, if POD in antisense tobacco was at the threshold for normal lignification, POD activity would limit lignin production when growth was stimulated, thereby leading to diminished lignin concentrations under elevated CO2. If the maintenance of normal POD activities was associated with metabolic costs that can be reallocated to growth in plants with suppressed POD activities, elevated CO2 was expected to stimulate growth significantly more in antisense‐POD tobacco than in controls. Transgenic tobacco displayed 15% taller stems at bud set than controls, but this had no effect on whole‐plant biomass. There was no extra effect of elevated CO2 on biomass production in antisense‐POD plants as compared with untransformed plants. These findings indicate that costs incurred with POD were unimportant with respect to whole‐plant biomass formation. Lignin concentrations in transgenic tobacco were unaffected as compared with controls except in the cortex (−8%), pointing to a role of anionic apoplastic POD in cortex but not in xylem lignification. Elevated CO2 resulted in ca. 20% increased whole‐plant biomass and had no effects on lignin concentrations in leaves, cortex, or mature xylem tissue, but it resulted in decreased lignin concentrations in the youngest stem part. These results indicate that the suppression of lignification, which implies the presence of less rigid cell walls, may be important for accelerated elongation growth under elevated CO2.
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Claims 11
Claim · model-written summary
Transgenic tobacco stems were 15% taller at bud set than controls.
- Taxon
- tobacco
Nicotiana tabacume0 - Organ / stage
- bud sete0
- Treatment
- Transgenic tobaccoe0
- Outcome
- stemse0
- Direction
- tallere0
- Value
- 15%e0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Transgenic tobacco displayed 15% taller stems at bud set than controls, but this had no effect on whole‐plant biomass”
Claim · model-written summary
Transgenic tobacco had no change in whole-plant biomass versus controls.
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- Transgenic tobaccoe0
- Outcome
- whole‐plant biomasse0
- Direction
- no effecte0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Transgenic tobacco displayed 15% taller stems at bud set than controls, but this had no effect on whole‐plant biomass”
Claim · model-written summary
Elevated CO2 had no extra biomass effect in antisense-POD plants compared with untransformed plants.
- Taxon
- TobaccoNicotiana tabacumt0
- Material
- antisense‐POD plantse0
- Treatment
- elevated CO2e0
- Outcome
- biomass productione0
- Direction
- no extra effecte0
- Comparator
- untransformed plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no extra effect of elevated CO2 on biomass production in antisense‐POD plants as compared with untransformed plants”
t0“Tobacco”
Claim · model-written summary
The authors interpreted POD costs as unimportant for whole-plant biomass.
- Taxon
- TobaccoNicotiana tabacumt0
- Gene
- PODe0
- Outcome
- whole‐plant biomass formatione0
- Qualifier
- unimportante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“costs incurred with POD were unimportant with respect to whole‐plant biomass formation”
t0“Tobacco”
Claim · model-written summary
Transgenic tobacco lignin concentrations were unchanged outside cortex relative to controls.
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- transgenic tobaccoe0
- Outcome
- Lignin concentrationse0
- Direction
- unaffectede0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lignin concentrations in transgenic tobacco were unaffected as compared with controls except in the cortex (−8%)”
Claim · model-written summary
Transgenic tobacco cortex lignin concentration was 8% lower than controls.
- Taxon
- tobaccoNicotiana tabacume0
- Organ / stage
- cortexe0
- Treatment
- transgenic tobaccoe0
- Outcome
- Lignin concentrationse0
- Direction
- lowerinferrede0
- Value
- −8%e0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lignin concentrations in transgenic tobacco were unaffected as compared with controls except in the cortex (−8%)”
Claim · model-written summary
The authors infer a role for anionic apoplastic POD in cortex lignification.
- Taxon
- TobaccoNicotiana tabacumt0
- Gene
- anionic apoplastic PODe0
- Outcome
- cortexe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“pointing to a role of anionic apoplastic POD in cortex but not in xylem lignification”
t0“Tobacco”
Claim · model-written summary
Elevated CO2 increased whole-plant biomass by about 20%.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- Elevated CO2e0
- Outcome
- whole‐plant biomasse0
- Direction
- increasede0
- Value
- ca. 20%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Elevated CO2 resulted in ca. 20% increased whole‐plant biomass”
t0“Tobacco”
Claim · model-written summary
Elevated CO2 did not affect lignin concentrations in leaves, cortex, or mature xylem.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- Elevated CO2e0
- Outcome
- lignin concentrations in leaves, cortex, or mature xylem tissuee0
- Direction
- no effectse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Elevated CO2 resulted in ca. 20% increased whole‐plant biomass and had no effects on lignin concentrations in leaves, cortex, or mature xylem tissue”
t0“Tobacco”
Claim · model-written summary
Elevated CO2 decreased lignin in the youngest stem part.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- Elevated CO2e0
- Outcome
- lignin concentrations in the youngest stem parte0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Elevated CO2 resulted in ca. 20% increased whole‐plant biomass and had no effects on lignin concentrations in leaves, cortex, or mature xylem tissue, but it resulted in decreased lignin concentrations in the youngest stem part”
t0“Tobacco”
Claim · model-written summary
Suppressed lignification may facilitate accelerated elongation under elevated CO2 through less rigid cell walls.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- elevated CO2e0
- Outcome
- accelerated elongation growthe0
- Qualifier
- less rigid cell wallse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the suppression of lignification, which implies the presence of less rigid cell walls, may be important for accelerated elongation growth under elevated CO2”
t0“Tobacco”
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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.