Abstract
Seed from six Australian near-isogenic lines of wild oat were germinated and grown in controlled-environment growth chambers under either ambient CO2 (357 parts per million by volume [ppmv]) or elevated CO2 (480 ppmv) at 20/16 C or 23/19 C. Three soil moisture treatments—−0.01 MPa (field capacity), −0.10 MPa, or −1.00 MPa—were imposed. Wild oat lines grown under elevated CO2 had higher seed production and greater plant dry weights, although the response of these variates involved a complex of interactions with temperature, soil moisture, and line. Plant height varied with wild oat line, and plants grown at 20/16 C were taller than those grown at 23/19 C. At 23/19 C, time taken to mature was reduced for some wild oat lines, and elevated CO2 reduced the time taken to maturity for some lines at 20/16 C. There was no significant difference in the level of dormancy developed in freshly harvested caryopses between the two CO2 treatments, but an effect was present in seed that had been after-ripened for 193 d. These results indicate that the main climate change variables ([CO2], soil moisture, and increased temperature) directly influence the growth and development of wild oat and are likely to affect the population dynamics of this species.
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Claims 8
Claim · model-written summary
Elevated CO2 increased wild oat seed production.
- Taxon
- Wild oate0
- Treatment
- elevated CO2e0
- Outcome
- seed productione0
- Direction
- highere0
- Qualifier
- interactions with temperature, soil moisture, and linee0
Not reportedComparator
Verbatim
e0“Wild oat lines grown under elevated CO2 had higher seed production and greater plant dry weights, although the response of these variates involved a complex of interactions with temperature, soil moisture, and line.”
Claim · model-written summary
Elevated CO2 increased wild oat plant dry weight with interactions involving temperature, moisture and line.
- Taxon
- Wild oate0
- Treatment
- elevated CO2e0
- Outcome
- plant dry weightse0
- Direction
- greatere0
- Qualifier
- interactions with temperature, soil moisture, and linee0
Not reportedComparator
Verbatim
e0“Wild oat lines grown under elevated CO2 had higher seed production and greater plant dry weights, although the response of these variates involved a complex of interactions with temperature, soil moisture, and line.”
Claim · model-written summary
Wild oat height varied by line.
Not reportedDirection
Verbatim
e0“Plant height varied with wild oat line”
Claim · model-written summary
Wild oat plants at 20/16 C were taller than plants at 23/19 C.
Verbatim
e0“plants grown at 20/16 C were taller than those grown at 23/19 C.”
t0“wild oat in monoculture”
Claim · model-written summary
At 23/19 C, some wild oat lines matured sooner.
- Taxon
- wild oate0
- Treatment
- 23/19 Ce0
- Outcome
- time taken to maturee0
- Direction
- reducede0
- Qualifier
- some wild oat linese0
Not reportedComparator
Verbatim
e0“At 23/19 C, time taken to mature was reduced for some wild oat lines”
Claim · model-written summary
At 20/16 C, elevated CO2 shortened time to maturity for some wild oat lines.
- Taxon
- wild oatt0
- Treatment
- elevated CO2e0
- Outcome
- time taken to maturitye0
- Direction
- reducede0
- Qualifier
- some lines at 20/16 Ce0
Not reportedComparator
Verbatim
e0“elevated CO2 reduced the time taken to maturity for some lines at 20/16 C.”
t0“wild oat”
Claim · model-written summary
Freshly harvested wild oat caryopses had no significant dormancy difference between CO2 treatments.
Verbatim
e0“There was no significant difference in the level of dormancy developed in freshly harvested caryopses between the two CO2 treatments”
t0“wild oat”
Claim · model-written summary
After 193 days of after-ripening, wild oat seed dormancy differed between CO2 treatments.
- Taxon
- wild oatt0
- Organ / stage
- seede0
- Treatment
- CO2 treatmentse1
- Outcome
- effecte0
- Qualifier
- after-ripened for 193 de0
Not reportedComparatorDirection
Verbatim
e0“an effect was present in seed that had been after-ripened for 193 d.”
t0“wild oat”
e1“between the two CO2 treatments”
The same questions in other papers
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- negative
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co2 · growth · Avena sativa (oats)Positive and negative results
4 papers in the same direction as this paper · 2 in the opposite direction
- no effect
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3 papers more in this group
See all 7 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.