Abstract
Because wild lines of the same species often represent a weedy constraint to cultivated crops in the field, any differential response to atmospheric carbon dioxide concentration, [CO 2 ], may alter weed–crop competition and seed yield. We evaluated the growth and reproduction of cultivated rice ( Oryza sativa L.; Clearfield, CL161) and red or weedy rice (Stuttgart, StgS) in monoculture, and at two competitive densities (8 and 16 plants m −2 ) using [CO 2 ] that corresponded to the 1940s, current levels, and that projected for the middle for the current century (300, 400, and 500 μmol mol −1 , respectively). Competition was determined using plant relative yield (PRY) for biomass and seed yield as a function of [CO 2 ]. At maturity, PRY significantly increased for wild rice, but decreased for the cultivated line as a function of competitive density. Increases in [CO 2 ] resulted in significant decreases in the PRY of seed yield at both competitive densities for CL161; while significant increases in seed yield and aboveground biomass were noted for StgS, but only at the higher competitive density. In addition, the relative increase in seed yield for CL161–StgS, determined at the same competitive density, increased as a function of [CO 2 ] suggesting a greater amount of seed rain from the weedy rice. Overall, these are the first data to indicate that for rice, weedy lines may have been favored as a function of rising carbon dioxide, with greater relative impact on the seed yield and biomass of cultivated rice lines.
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Claims 6
Claim · model-written summary
Plant relative yield of wild rice increased with competitive density.
- Taxon
- rice
Oryza sativat0 - Treatment
- competitive densitye1
- Outcome
- PRYe1
- Direction
- increasede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Competitive Interactions between Cultivated and Red Rice”
e1“At maturity, PRY significantly increased for wild rice, but decreased for the cultivated line as a function of competitive density”
Claim · model-written summary
Plant relative yield of the cultivated rice line decreased with competitive density.
- Taxon
- riceOryza sativat0
- Material
- cultivated linee1
- Treatment
- competitive densitye1
- Outcome
- PRYe1
- Direction
- decreasede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Competitive Interactions between Cultivated and Red Rice”
e1“At maturity, PRY significantly increased for wild rice, but decreased for the cultivated line as a function of competitive density”
Claim · model-written summary
Rising CO2 significantly decreased the plant relative yield of seed for cultivated rice CL161 at both competitive densities.
- Taxon
- riceOryza sativat0
- Material
- CL161e2
- Treatment
- Increases in [CO 2 ]e2
- Outcome
- PRY of seed yielde2
- Direction
- decreasese2
- Qualifier
- at both competitive densitiese2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Competitive Interactions between Cultivated and Red Rice”
e2“Increases in [CO 2 ] resulted in significant decreases in the PRY of seed yield at both competitive densities for CL161”
Claim · model-written summary
Weedy rice StgS increased seed yield and aboveground biomass at the higher competitive density.
- Taxon
- riceOryza sativat0
- Material
- StgSe3
- Treatment
- higher competitive densitye3
- Interactor
- StgSe3weed
- Outcome
- seed yield and aboveground biomasse3
- Direction
- increasese3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Competitive Interactions between Cultivated and Red Rice”
e3“while significant increases in seed yield and aboveground biomass were noted for StgS, but only at the higher competitive density”
Claim · model-written summary
The relative seed yield increase of the CL161–StgS mixture rose with CO2, suggesting more seed rain from the weedy rice.
- Taxon
- riceOryza sativat0
- Material
- CL161–StgSe4
- Treatment
- [CO 2 ]e4
- Interactor
- weedy ricee4weed
- Outcome
- relative increase in seed yield for CL161–StgSe4
- Direction
- increasede4
- Qualifier
- suggesting a greater amount of seed rain from the weedy ricee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Competitive Interactions between Cultivated and Red Rice”
e4“the relative increase in seed yield for CL161–StgS, determined at the same competitive density, increased as a function of [CO 2 ] suggesting a greater amount of seed rain from the weedy rice”
Claim · model-written summary
Weedy rice lines may have been favored by rising carbon dioxide, with a greater relative impact on seed yield and biomass of cultivated rice lines.
- Taxon
- riceOryza sativat0
- Treatment
- rising carbon dioxidee5
- Interactor
- weedy linese5weed
- Outcome
- seed yield and biomass of cultivated rice linese5
- Direction
- greatere5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Competitive Interactions between Cultivated and Red Rice”
e5“Overall, these are the first data to indicate that for rice, weedy lines may have been favored as a function of rising carbon dioxide, with greater relative impact on the seed yield and biomass of cultivated rice lines”
The same questions in other papers
co2 · yield · Oryza sativa (rice)Positive and negative results
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See all 159 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.