Abstract
Photosynthetic parameters and leaf carbon isotope composition (δ13C) in contrasting rice genotypes in relation to supplemental nitrogen (N) application and water management during the grain-filling period were compared. The changes in stomatal conductance (g s) and ratio of intercellular to ambient CO2 mole fraction (C i/C a) depended on the leaf nitrogen concentration (leaf N) in both 'Hinohikari' (temperate japonica genotype) and 'IR36' (indica genotype). In 'Hinohikari', δ13C reflects photosynthetic gas exchange during the grain-filling period, which is indicated by the significant response of δ13C to leaf N. In contrast, in 'IR36' δ13C did not depend on leaf N. This varietal difference in δ13C to leaf N can be attributed to a difference in the timing of leaf senescence. In 'IR36', leaf N and photosynthetic parameters decreased more rapidly, indicating earlier senescence and a shorter grain-filling period in comparison with 'Hinohikari'. The significant increase in shoot dry mass in 'Hinohikari' resulting from supplemental N application, compared with nonsignificant effect observed in 'IR36', suggests that the timing of senescence in relation to the grainfilling period has a preponderant influence on productivity.
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Claims 10
Claim · model-written summary
Stomatal conductance changes depended on leaf nitrogen in both cultivars.
- Taxon
- rice
Oryza sativat0 - Material
- 'Hinohikari'e0
- Compound
- leaf nitrogene0
- Outcome
- stomatal conductancee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Contribution of leaf nitrogen to photosynthetic gas exchange in contrasting rice (Oryza sativa L.) cultivars during the grain-filling period”
e0“The changes in stomatal conductance (g s) and ratio of intercellular to ambient CO2 mole fraction (C i/C a) depended on the leaf nitrogen concentration (leaf N) in both 'Hinohikari' (temperate japonica genotype) and 'IR36' (indica genotype)”
Claim · model-written summary
The intercellular to ambient CO2 ratio depended on leaf nitrogen in both cultivars.
- Taxon
- riceOryza sativat0
- Material
- 'IR36'e0
- Compound
- leaf nitrogene0
- Outcome
- ratio of intercellular to ambient CO2 mole fractione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Contribution of leaf nitrogen to photosynthetic gas exchange in contrasting rice (Oryza sativa L.) cultivars during the grain-filling period”
e0“ratio of intercellular to ambient CO2 mole fraction (C i/C a) depended on the leaf nitrogen concentration (leaf N) in both 'Hinohikari' (temperate japonica genotype) and 'IR36' (indica genotype)”
Claim · model-written summary
In Hinohikari, δ13C responded significantly to leaf nitrogen and reflected grain-filling gas exchange.
- Taxon
- riceOryza sativat0
- Material
- 'Hinohikari'e0
- Compound
- leaf Ne0
- Outcome
- δ13Ce0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Contribution of leaf nitrogen to photosynthetic gas exchange in contrasting rice (Oryza sativa L.) cultivars during the grain-filling period”
e0“In 'Hinohikari', δ13C reflects photosynthetic gas exchange during the grain-filling period, which is indicated by the significant response of δ13C to leaf N”
Claim · model-written summary
In IR36, δ13C did not depend on leaf nitrogen.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Contribution of leaf nitrogen to photosynthetic gas exchange in contrasting rice (Oryza sativa L.) cultivars during the grain-filling period”
e0“in 'IR36' δ13C did not depend on leaf N”
Claim · model-written summary
IR36 leaf nitrogen declined more rapidly than in Hinohikari.
- Taxon
- riceOryza sativat0
- Material
- 'IR36'e0
- Outcome
- leaf Ne0
- Direction
- decreased more rapidlye0
- Comparator
- 'Hinohikari'e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Contribution of leaf nitrogen to photosynthetic gas exchange in contrasting rice (Oryza sativa L.) cultivars during the grain-filling period”
e0“In 'IR36', leaf N and photosynthetic parameters decreased more rapidly, indicating earlier senescence and a shorter grain-filling period in comparison with 'Hinohikari'”
Claim · model-written summary
IR36 photosynthetic parameters declined more rapidly than in Hinohikari.
- Taxon
- riceOryza sativat0
- Material
- 'IR36'e0
- Outcome
- photosynthetic parameterse0
- Direction
- decreased more rapidlye0
- Comparator
- 'Hinohikari'e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Contribution of leaf nitrogen to photosynthetic gas exchange in contrasting rice (Oryza sativa L.) cultivars during the grain-filling period”
e0“In 'IR36', leaf N and photosynthetic parameters decreased more rapidly, indicating earlier senescence and a shorter grain-filling period in comparison with 'Hinohikari'”
Claim · model-written summary
IR36 senesced earlier than Hinohikari.
- Taxon
- riceOryza sativat0
- Material
- 'IR36'e1
- Outcome
- senescencee0
- Direction
- earliere0
- Comparator
- 'Hinohikari'e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Contribution of leaf nitrogen to photosynthetic gas exchange in contrasting rice (Oryza sativa L.) cultivars during the grain-filling period”
e0“indicating earlier senescence and a shorter grain-filling period in comparison with 'Hinohikari'”
e1“In 'IR36', leaf N and photosynthetic parameters decreased more rapidly”
Claim · model-written summary
IR36 had a shorter grain-filling period than Hinohikari.
- Taxon
- riceOryza sativat0
- Material
- 'IR36'e1
- Outcome
- grain-filling periode0
- Direction
- shortere0
- Comparator
- 'Hinohikari'e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Contribution of leaf nitrogen to photosynthetic gas exchange in contrasting rice (Oryza sativa L.) cultivars during the grain-filling period”
e0“a shorter grain-filling period in comparison with 'Hinohikari'”
e1“In 'IR36', leaf N and photosynthetic parameters decreased more rapidly”
Claim · model-written summary
Supplemental nitrogen significantly increased shoot dry mass in Hinohikari.
- Taxon
- riceOryza sativat0
- Material
- 'Hinohikari'e0
- Treatment
- supplemental N applicatione0
- Outcome
- shoot dry masse0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Contribution of leaf nitrogen to photosynthetic gas exchange in contrasting rice (Oryza sativa L.) cultivars during the grain-filling period”
e0“The significant increase in shoot dry mass in 'Hinohikari' resulting from supplemental N application”
Claim · model-written summary
Supplemental nitrogen had a nonsignificant effect on shoot dry mass in IR36.
- Taxon
- riceOryza sativat0
- Material
- 'IR36'e0
- Treatment
- supplemental N applicatione1
- Outcome
- shoot dry masse1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Contribution of leaf nitrogen to photosynthetic gas exchange in contrasting rice (Oryza sativa L.) cultivars during the grain-filling period”
e0“compared with nonsignificant effect observed in 'IR36'”
e1“The significant increase in shoot dry mass in 'Hinohikari' resulting from supplemental N application”
The same questions in other papers
nitrogen · growth · Oryza sativa (rice)Positive and negative results
401 papers in the same direction as this paper · 101 in the opposite direction · 8 reporting no difference from an alternative
- negative
- negative
- negative
507 papers more in this group
See all 511 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.