Abstract
There is some evidence that rice cultivars respond differently to elevated CO2 concentrations ([CO2]), but [CO2]×cultivar interaction has never been tested under open-field conditions across different sites. Here, we report on trials conducted at free-air CO2 enrichment (FACE) facilities at two sites in Japan, Shizukuishi (2007 and 2008) and Tsukuba (2010). The average growing-season air temperature was more than 5°C warmer at Tsukuba than at Shizukuishi. For four cultivars tested at both sites, the [CO2]×cultivar interaction was significant for brown rice yield, but there was no significant interaction with site-year. Higher-yielding cultivars with a large sink size showed a greater [CO2] response. The Tsukuba FACE experiment, which included eight cultivars, revealed a wider range of yield enhancement (3-36%) than the multi-site experiment. All of the tested yield components contributed to this enhancement, but there was a highly significant [CO2]×cultivar interaction for percentage of ripened spikelets. These results suggest that a large sink is a prerequisite for higher productivity under elevated [CO2], but that improving carbon allocation by increasing grain setting may also be a practical way of increasing the yield response to elevated [CO2].
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Claims 8
Claim · model-written summary
The CO2-by-cultivar interaction was significant for brown rice yield across four cultivars tested at both sites.
- Taxon
- Rice
Oryza sativat0 - Material
- four cultivarse1
- Outcome
- brown rice yielde1
- Qualifier
- [CO2]×cultivar interactione1
- Setting
- both sitese1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice cultivar responses to elevated CO2 at two free-air CO2 enrichment (FACE) sites in Japan”
e1“For four cultivars tested at both sites, the [CO2]×cultivar interaction was significant for brown rice yield, but there was no significant interaction with site-year”
Claim · model-written summary
The CO2-by-cultivar interaction was not significant with site-year.
- Taxon
- RiceOryza sativat0
- Material
- four cultivarse1
- Outcome
- interaction with site-yeare1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice cultivar responses to elevated CO2 at two free-air CO2 enrichment (FACE) sites in Japan”
e1“For four cultivars tested at both sites, the [CO2]×cultivar interaction was significant for brown rice yield, but there was no significant interaction with site-year”
Claim · model-written summary
Higher-yielding rice cultivars with a large sink size showed a greater CO2 response.
- Taxon
- RiceOryza sativat0
- Material
- Higher-yielding cultivars with a large sink sizee2
- Outcome
- [CO2] responsee2
- Direction
- greatere2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice cultivar responses to elevated CO2 at two free-air CO2 enrichment (FACE) sites in Japan”
e2“Higher-yielding cultivars with a large sink size showed a greater [CO2] response”
Claim · model-written summary
Elevated CO2 under FACE at Tsukuba enhanced rice yield by 3-36% across eight cultivars, a wider range than the multi-site experiment.
- Taxon
- RiceOryza sativat0
- Material
- eight cultivarse3
- Treatment
- FACEe3
- Outcome
- yield enhancemente3
- Direction
- wider rangee3
- Value
- 3-36%e3
- Comparator
- multi-site experimente3
- Setting
- Tsukuba FACE experimente3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice cultivar responses to elevated CO2 at two free-air CO2 enrichment (FACE) sites in Japan”
e3“The Tsukuba FACE experiment, which included eight cultivars, revealed a wider range of yield enhancement (3-36%) than the multi-site experiment”
Claim · model-written summary
All tested yield components contributed to the yield enhancement under elevated CO2.
- Taxon
- RiceOryza sativat0
- Outcome
- yield componentse4
- Qualifier
- contributed to this enhancemente4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice cultivar responses to elevated CO2 at two free-air CO2 enrichment (FACE) sites in Japan”
e4“All of the tested yield components contributed to this enhancement”
Claim · model-written summary
The CO2-by-cultivar interaction for percentage of ripened spikelets was highly significant.
- Taxon
- RiceOryza sativat0
- Material
- cultivare5
- Outcome
- percentage of ripened spikeletse5
- Qualifier
- [CO2]×cultivar interactione5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice cultivar responses to elevated CO2 at two free-air CO2 enrichment (FACE) sites in Japan”
e5“there was a highly significant [CO2]×cultivar interaction for percentage of ripened spikelets”
Claim · model-written summary
A large sink is a prerequisite for higher rice productivity under elevated CO2.
- Taxon
- RiceOryza sativat0
- Outcome
- higher productivity under elevated [CO2]e6
- Qualifier
- a large sink is a prerequisitee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice cultivar responses to elevated CO2 at two free-air CO2 enrichment (FACE) sites in Japan”
e6“These results suggest that a large sink is a prerequisite for higher productivity under elevated [CO2]”
Claim · model-written summary
Improving carbon allocation by increasing grain setting may be a practical way to increase the rice yield response to elevated CO2.
- Taxon
- RiceOryza sativat0
- Outcome
- improving carbon allocation by increasing grain settinge7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice cultivar responses to elevated CO2 at two free-air CO2 enrichment (FACE) sites in Japan”
e7“improving carbon allocation by increasing grain setting may also be a practical way of increasing the yield response to elevated [CO2]”
The same questions in other papers
co2 · yield · Oryza sativa (rice)Positive and negative results
130 papers in the same direction as this paper · 28 in the opposite direction
- negative
- no effect
- negative
155 papers more in this group
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.