Abstract
S ummary Four populations of Phlox drummondii and one population each of Datura stramonium and Abutilon theophrasti were grown in six growth chambers at 300, 600 and 900 μ l l −1 CO 2 , all other environmental variables remaining constant. Changes in timing and numbers of flowers produced were species‐ and population‐dependent. In general, P. drummondii and D. stramonium flowered earlier under high CO 2 while A. theophrasti was not affected. Significant population × CO 2 interactions were found for several flower production characters in P. drummondii , indicating differential response to elevated CO 2 levels even within a species. In D. stramonium , increased biomass in high CO 2 caused significantly larger fruits to be formed, but there was no significant increase in seed number. In A. theophrasti , individual seed weight increased with increasing CO 2 , but total seed weight per plant remained constant. These results are discussed in relation to their possible implications to plant community structure, and the effects on higher trophic levels (e.g. pollinators and plant predators). Qualitative as well as quantitative changes in plants in response to high CO 2 must be studied with care to ensure correct predictions of the effects of the global rise in CO 2 .
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Claims 8
Claim · model-written summary
Phlox drummondii flowered earlier under high carbon dioxide.
- Taxon
- P. drummondii
Phlox drummondiie0 - Treatment
- high CO 2e0
- Outcome
- flowerede0
- Direction
- earliere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P. drummondii and D. stramonium flowered earlier under high CO 2”
Claim · model-written summary
Datura stramonium flowered earlier under high carbon dioxide.
- Taxon
- D. stramonium
.jpg?width=60)
Datura stramoniume0 - Treatment
- high CO 2e0
- Outcome
- flowerede0
- Direction
- earliere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“P. drummondii and D. stramonium flowered earlier under high CO 2”
Claim · model-written summary
Abutilon theophrasti flowering was unaffected by high carbon dioxide.
- Taxon
- A. theophrasti
Abutilon theophrastie0 - Treatment
- high CO 2e1
- Outcome
- not affectede0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A. theophrasti was not affected.”
t0“ELEVATED CO2 ON PLANTS”
e1“P. drummondii and D. stramonium flowered earlier under high CO 2”
Claim · model-written summary
Phlox flower production characters varied in carbon dioxide response among populations.
- Taxon
- P. drummondiiPhlox drummondiie0
- Treatment
- CO 2e0
- Outcome
- flower production characterse0
- Direction
- differential responsee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant population × CO 2 interactions were found for several flower production characters in P. drummondii , indicating differential response to elevated CO 2 levels even within a species.”
Claim · model-written summary
High carbon dioxide significantly increased Datura fruit size.
- Taxon
- D. stramoniumDatura stramoniume0
- Treatment
- high CO 2e0
- Outcome
- fruitse0
- Direction
- largere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In D. stramonium , increased biomass in high CO 2 caused significantly larger fruits to be formed”
Claim · model-written summary
Datura seed number did not increase significantly.
- Taxon
- D. stramoniumDatura stramoniume1
- Treatment
- ELEVATED CO2t0
- Outcome
- seed numbere0
- Direction
- no significant increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was no significant increase in seed number.”
t0“ELEVATED CO2 ON PLANTS”
e1“P. drummondii and D. stramonium flowered earlier under high CO 2”
Claim · model-written summary
Abutilon individual seed weight rose with carbon dioxide.
- Taxon
- A. theophrastiAbutilon theophrastie0
- Treatment
- increasing CO 2e0
- Outcome
- individual seed weighte0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In A. theophrasti , individual seed weight increased with increasing CO 2”
Claim · model-written summary
Abutilon total seed weight per plant remained constant.
- Taxon
- A. theophrastiAbutilon theophrastie1
- Treatment
- ELEVATED CO2t0
- Outcome
- total seed weight per plante0
- Direction
- remained constante0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“total seed weight per plant remained constant.”
t0“ELEVATED CO2 ON PLANTS”
e1“A. theophrasti was not affected.”
The same questions in other papers
co2 · yield · Abutilon theophrasti (velvetleaf)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
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.