Abstract
The metabolic basis for observed differences in the yield response of rice to projected carbon dioxide concentrations (CO 2 ) is unclear. In this study, three rice cultivars, differing in their yield response to elevated CO 2 , were grown under ambient and elevated CO 2 conditions, using the free‐air CO 2 enrichment technology. Flag leaves of rice were used to determine (1) if manipulative increases in sink strength decreased the soluble sucrose concentration for the ‘weak’ responders and (2), whether the genetic expression of sucrose transporters OsSUT1 and OsSUT2 was associated with an accumulation of soluble sugars and the maintenance of photosynthetic capacity. For the cultivars that showed a weak response to additional CO 2 , photosynthetic capacity declined under elevated CO 2 and was associated with an accumulation of soluble sugars. For these cultivars, increasing sink relative to source strength did not increase photosynthesis and no change in OsSUT1 or OsSUT2 expression was observed. In contrast, the ‘strong’ response cultivar did not show an increase in soluble sugars or a decline in photosynthesis but demonstrated significant increases in OsSUT1 and OsSUT2 expression at elevated CO 2 . Overall, these data suggest that the expression of the sucrose transport genes OsSUT1 and OsSUT2 may be associated with the maintenance of photosynthetic capacity of the flag leaf during grain fill; and, potentially, greater yield response of rice as atmospheric CO 2 increases.
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Claims 10
Claim · model-written summary
Weak response rice cultivars had declining photosynthetic capacity under elevated CO2.
- Taxon
- rice
Oryza sativat0 - Material
- cultivars that showed a weak responsee0
- Treatment
- elevated CO 2e0
- Outcome
- photosynthetic capacitye0
- Direction
- declinede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For the cultivars that showed a weak response to additional CO 2 , photosynthetic capacity declined under elevated CO 2”
t0“rice cultivars”
Claim · model-written summary
Weak response cultivars accumulated soluble sugars under elevated CO2.
- Taxon
- riceOryza sativat0
- Material
- cultivars that showed a weak responsee0
- Treatment
- elevated CO 2e0
- Outcome
- accumulation of soluble sugarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For the cultivars that showed a weak response to additional CO 2 , photosynthetic capacity declined under elevated CO 2 and was associated with an accumulation of soluble sugars”
t0“rice cultivars”
Claim · model-written summary
Increasing sink relative to source strength did not increase photosynthesis in weak response cultivars.
- Taxon
- riceOryza sativat0
- Treatment
- increasing sink relative to source strengthe0
- Outcome
- photosynthesise0
- Direction
- did not increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For these cultivars, increasing sink relative to source strength did not increase photosynthesis”
t0“rice cultivars”
Claim · model-written summary
OsSUT1 expression did not change in weak response cultivars.
- Taxon
- riceOryza sativat0
- Gene
- OsSUT1e0
- Outcome
- OsSUT1 or OsSUT2 expressione0
- Direction
- no changee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no change in OsSUT1 or OsSUT2 expression was observed”
t0“rice cultivars”
Claim · model-written summary
OsSUT2 expression did not change in weak response cultivars.
- Taxon
- riceOryza sativat0
- Gene
- OsSUT2e0
- Outcome
- OsSUT1 or OsSUT2 expressione0
- Direction
- no changee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no change in OsSUT1 or OsSUT2 expression was observed”
t0“rice cultivars”
Claim · model-written summary
Strong response cultivar showed no increase in soluble sugars at elevated CO2.
- Taxon
- riceOryza sativat0
- Material
- ‘strong’ response cultivare0
- Treatment
- elevated CO 2e0
- Outcome
- soluble sugarse0
- Direction
- did not show an increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the ‘strong’ response cultivar did not show an increase in soluble sugars or a decline in photosynthesis but demonstrated significant increases in OsSUT1 and OsSUT2 expression at elevated CO 2”
t0“rice cultivars”
Claim · model-written summary
Strong response cultivar showed no decline in photosynthesis at elevated CO2.
- Taxon
- riceOryza sativat0
- Material
- ‘strong’ response cultivare0
- Treatment
- elevated CO 2e0
- Outcome
- photosynthesise0
- Direction
- did not show an increase in soluble sugars or a declinee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the ‘strong’ response cultivar did not show an increase in soluble sugars or a decline in photosynthesis but demonstrated significant increases in OsSUT1 and OsSUT2 expression at elevated CO 2”
t0“rice cultivars”
Claim · model-written summary
OsSUT1 expression increased significantly in the strong response cultivar at elevated CO2.
- Taxon
- riceOryza sativat0
- Material
- ‘strong’ response cultivare0
- Treatment
- elevated CO 2e0
- Gene
- OsSUT1e0
- Outcome
- OsSUT1 and OsSUT2 expressione0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the ‘strong’ response cultivar did not show an increase in soluble sugars or a decline in photosynthesis but demonstrated significant increases in OsSUT1 and OsSUT2 expression at elevated CO 2”
t0“rice cultivars”
Claim · model-written summary
OsSUT2 expression increased significantly in the strong response cultivar at elevated CO2.
- Taxon
- riceOryza sativat0
- Material
- ‘strong’ response cultivare0
- Treatment
- elevated CO 2e0
- Gene
- OsSUT2e0
- Outcome
- OsSUT1 and OsSUT2 expressione0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the ‘strong’ response cultivar did not show an increase in soluble sugars or a decline in photosynthesis but demonstrated significant increases in OsSUT1 and OsSUT2 expression at elevated CO 2”
t0“rice cultivars”
Claim · model-written summary
Authors suggest OsSUT1 and OsSUT2 expression may be associated with maintained flag leaf photosynthetic capacity and potentially greater rice yield response as CO2 increases.
- Taxon
- riceOryza sativae0
- Gene
- OsSUT1 and OsSUT2e0
- Outcome
- maintenance of photosynthetic capacity of the flag leafe0
- Qualifier
- may be associatede0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the expression of the sucrose transport genes OsSUT1 and OsSUT2 may be associated with the maintenance of photosynthetic capacity of the flag leaf during grain fill; and, potentially, greater yield response of rice as atmospheric CO 2 increases”
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See all 8 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.