Abstract
Rice paddies are a major source of anthropogenic nitrous oxide (N2O) emissions, especially under alternate wetting-drying irrigation and high N input. Increasing photosynthate allocation to the grain in rice (Oryza sativa L.) has been identified as an effective strategy of genetic and agronomic innovation for yield enhancement; however, its impacts on N2O emissions are still unknown. We conducted three independent but complementary experiments (variety, mutant study, and spikelet clipping) to examine the impacts of rice plant photosynthate allocation on paddy N2O emissions. The three experiments showed that N2O fluxes were significantly and negatively correlated with the ratio of grain yield to total aboveground biomass, known as the harvest index (HI) in agronomy (P < 0.01). Biomass accumulation and N uptake after anthesis were significantly and positively correlated with HI (P < 0.05). Reducing photosynthate allocation to the grain by spikelet clipping significantly increased white root biomass and soil dissolved organic C and reduced plant N uptake, resulting in high soil denitrification potential (P < 0.05). Our findings demonstrate that optimizing photosynthate allocation to the grain can reduce paddy N2O emissions through decreasing belowground C input and increasing plant N uptake, suggesting the potential for genetic and agronomic efforts to produce more rice with less N2O emissions.
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Claims 8
Claim · model-written summary
Paddy N2O fluxes correlated negatively with rice harvest index.
- Taxon
- Oryza sativa L.
Oryza sativae0 - Outcome
- N2O fluxese1
- Direction
- negatively correlatede1
- Qualifier
- P < 0.01e1
- Comparator
- harvest index (HI)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice (Oryza sativa L.)”
e1“N2O fluxes were significantly and negatively correlated with the ratio of grain yield to total aboveground biomass, known as the harvest index (HI) in agronomy (P < 0.01)”
Claim · model-written summary
Post anthesis biomass accumulation correlated positively with harvest index.
- Taxon
- Oryza sativa L.Oryza sativae0
- Outcome
- Biomass accumulatione1
- Direction
- positively correlatede1
- Comparator
- HIe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice (Oryza sativa L.)”
e1“Biomass accumulation and N uptake after anthesis were significantly and positively correlated with HI (P < 0.05)”
Claim · model-written summary
Post anthesis nitrogen uptake correlated positively with harvest index.
- Taxon
- Oryza sativa L.Oryza sativae0
- Outcome
- N uptakee1
- Direction
- positively correlatede1
- Comparator
- HIe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice (Oryza sativa L.)”
e1“Biomass accumulation and N uptake after anthesis were significantly and positively correlated with HI (P < 0.05)”
Claim · model-written summary
Spikelet clipping increased white root biomass.
- Taxon
- Oryza sativa L.Oryza sativae0
- Treatment
- spikelet clippinge1
- Outcome
- white root biomasse1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice (Oryza sativa L.)”
e1“Reducing photosynthate allocation to the grain by spikelet clipping significantly increased white root biomass and soil dissolved organic C and reduced plant N uptake”
Claim · model-written summary
Spikelet clipping increased soil dissolved organic carbon.
- Taxon
- Oryza sativa L.Oryza sativae0
- Treatment
- spikelet clippinge1
- Outcome
- soil dissolved organic Ce1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice (Oryza sativa L.)”
e1“Reducing photosynthate allocation to the grain by spikelet clipping significantly increased white root biomass and soil dissolved organic C and reduced plant N uptake”
Claim · model-written summary
Spikelet clipping reduced plant nitrogen uptake.
- Taxon
- Oryza sativa L.Oryza sativae0
- Treatment
- spikelet clippinge1
- Outcome
- plant N uptakee1
- Direction
- reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice (Oryza sativa L.)”
e1“Reducing photosynthate allocation to the grain by spikelet clipping significantly increased white root biomass and soil dissolved organic C and reduced plant N uptake”
Claim · model-written summary
Spikelet clipping resulted in high soil denitrification potential.
- Taxon
- Oryza sativa L.Oryza sativae0
- Treatment
- spikelet clippinge1
- Outcome
- soil denitrification potentiale1
- Direction
- highe1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice (Oryza sativa L.)”
e1“Reducing photosynthate allocation to the grain by spikelet clipping significantly increased white root biomass and soil dissolved organic C and reduced plant N uptake, resulting in high soil denitrification potential (P < 0.05)”
Claim · model-written summary
Optimized allocation to grain can reduce paddy N2O emissions.
- Taxon
- Oryza sativa L.Oryza sativae0
- Outcome
- reduce paddy N2O emissionse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice (Oryza sativa L.)”
e1“optimizing photosynthate allocation to the grain can reduce paddy N2O emissions through decreasing belowground C input and increasing plant N uptake”
The same questions in other papers
mechanical · growth · Oryza sativa (rice)Positive and negative results
2 papers in the same direction as this paper · 2 in the opposite direction
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