Abstract
Abstract BACKGROUND Climate models predict an increase in global temperature in response to a doubling of atmospheric [CO 2 ]. This may affect future rice production and quality. In this study, the effect of elevated [CO 2 ] on yield, nutrient acquisition and utilization, and grain quality of rice genotypes was investigated in the subtropical climate of eastern India (Kharagpur). Three environments (open field, ambient, and elevated [CO 2 ]) were tested using four rice cultivars of eastern India. RESULTS Under elevated [CO 2 ] (25% higher), the yield of high‐yielding cultivars (HYCs) viz IR 36, Swarna, and Swarna sub1 was significantly reduced (by 11–13%), whereas the yield increased (by 6–9%) for Badshabhog, a low‐yielding aromatic cultivar. Elevated [CO 2 ] significantly enhanced K uptake (by 14–21%), but did not influence the uptake of total N and P. The nutrient harvest index and use efficiency values in HYCs were reduced under elevated [CO 2 ] indicating that nutrient translocation from source to sink (grain) was significantly reduced. An increase in alkali spreading value (10%) and reduction in grain protein (2–3%) and iron (5–6%) was also observed upon [CO 2 ] elevation. CONCLUSION The study highlights the importance of nutrient management (increasing N rate for HYCs) and selective breeding of tolerant cultivars in minimizing the adverse effects of elevated [CO 2 ] on rice yield and quality. © 2018 Society of Chemical Industry
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Claims 14
Claim · model-written summary
Elevated CO2 reduced yield of IR 36 by 11–13%.
Not reportedTaxonComparator
Verbatim
e0“Under elevated [CO 2 ] (25% higher), the yield of high‐yielding cultivars (HYCs) viz IR 36, Swarna, and Swarna sub1 was significantly reduced (by 11–13%)”
Claim · model-written summary
Elevated CO2 reduced yield of Swarna by 11–13%.
Not reportedTaxonComparator
Verbatim
e0“Under elevated [CO 2 ] (25% higher), the yield of high‐yielding cultivars (HYCs) viz IR 36, Swarna, and Swarna sub1 was significantly reduced (by 11–13%)”
Claim · model-written summary
Elevated CO2 reduced yield of Swarna sub1 by 11–13%.
Not reportedTaxonComparator
Verbatim
e0“Under elevated [CO 2 ] (25% higher), the yield of high‐yielding cultivars (HYCs) viz IR 36, Swarna, and Swarna sub1 was significantly reduced (by 11–13%)”
Claim · model-written summary
Elevated CO2 increased Badshabhog yield by 6–9%.
Not reportedTaxonTreatmentComparator
Verbatim
e0“whereas the yield increased (by 6–9%) for Badshabhog, a low‐yielding aromatic cultivar.”
Claim · model-written summary
Elevated CO2 enhanced K uptake by 14–21%.
Not reportedTaxonComparator
Verbatim
e0“Elevated [CO 2 ] significantly enhanced K uptake (by 14–21%)”
Claim · model-written summary
Elevated CO2 did not influence total N uptake.
Not reportedTaxonComparator
Verbatim
e0“Elevated [CO 2 ] significantly enhanced K uptake (by 14–21%), but did not influence the uptake of total N and P.”
Claim · model-written summary
Elevated CO2 did not influence P uptake.
Not reportedTaxonComparator
Verbatim
e0“Elevated [CO 2 ] significantly enhanced K uptake (by 14–21%), but did not influence the uptake of total N and P.”
Claim · model-written summary
Elevated CO2 reduced nutrient harvest index and use efficiency in high-yielding cultivars.
- Treatment
- elevated [CO 2 ]e0
- Outcome
- nutrient harvest index and use efficiency valuese0
- Direction
- reducede0
Not reportedTaxonComparator
Verbatim
e0“The nutrient harvest index and use efficiency values in HYCs were reduced under elevated [CO 2 ]”
Claim · model-written summary
Elevated CO2 reduced nutrient translocation from source to grain.
Not reportedTaxonTreatmentComparator
Verbatim
e0“nutrient translocation from source to sink (grain) was significantly reduced.”
Claim · model-written summary
Elevated CO2 increased alkali spreading value by 10%.
Not reportedTaxonComparator
Verbatim
e0“An increase in alkali spreading value (10%) and reduction in grain protein (2–3%) and iron (5–6%) was also observed upon [CO 2 ] elevation.”
Claim · model-written summary
Elevated CO2 reduced grain protein by 2–3%.
Not reportedTaxonComparator
Verbatim
e0“An increase in alkali spreading value (10%) and reduction in grain protein (2–3%) and iron (5–6%) was also observed upon [CO 2 ] elevation.”
Claim · model-written summary
Elevated CO2 reduced grain iron by 5–6%.
Not reportedTaxonComparator
Verbatim
e0“An increase in alkali spreading value (10%) and reduction in grain protein (2–3%) and iron (5–6%) was also observed upon [CO 2 ] elevation.”
Claim · model-written summary
Authors recommend increasing N rate for high-yielding cultivars to reduce elevated CO2 harm.
- Taxon
- rice
Oryza sativae0 - Outcome
- increasing N rate for HYCse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nutrient management (increasing N rate for HYCs) and selective breeding of tolerant cultivars in minimizing the adverse effects of elevated [CO 2 ] on rice yield and quality.”
Claim · model-written summary
Authors recommend breeding tolerant cultivars to reduce elevated CO2 harm.
- Taxon
- riceOryza sativae0
- Outcome
- selective breeding of tolerant cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“selective breeding of tolerant cultivars in minimizing the adverse effects of elevated [CO 2 ] on rice yield and quality.”
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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.