Abstract
High yield rice ( Oryza sativa L.) cultivar Akenohoshi can realize a higher rate of photosynthesis during ripening by maintaining a higher level of ribulose‐1,5‐bisphosphate carboxylase/oxygenase (Rubisco) than cv. Nipponbare. To clarify the causal factors for the difference in the levels of Rubisco in leaves between rice cultivars and the mechanisms of action of cytokinins on the maintenance of high levels of Rubisco in leaves, the level of rbcL and rbcS transcripts and the nitrogen content of leaves were investigated. The Rubisco content remained high not only in plants given additional nitrogen fertilizer (NF) but also in plants sprayed with 6‐benzylaminopurine (BA). There was a close correlation between the Rubisco content and the level of rbcL and rbcS mRNAs. The maintenance of high leaf levels of Rubisco and of rbcL and rbcS mRNAs was related to the high nitrogen content in leaves, irrespective of the treatments and cultivars. The maintenance of high leaf nitrogen content was caused by an increase in nitrogen partitioning to leaves and not by an increase in nitrogen absorption by plants treated with BA. These results indicate that there are two probable effects of BA on the leaf level of Rubisco. One is the direct effect of BA inducing the synthesis of Rubisco. The other is the indirect effect of BA inducing the effective partitioning of nitrogen to leaves. Cytokinins could account for the difference in the reduction in leaf level of Rubisco during senescence between the rice cultivars.
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Claims 11
Claim · model-written summary
Akenohoshi maintains higher photosynthesis during ripening than Nipponbare.
- Taxon
- rice
Oryza sativat0 - Material
- Akenohoshie0
- Organ / stage
- ripeninge0
- Outcome
- rate of photosynthesise0
- Direction
- highere0
- Comparator
- Nipponbaree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cultivar Akenohoshi can realize a higher rate of photosynthesis during ripening by maintaining a higher level of ribulose‐1,5‐bisphosphate carboxylase/oxygenase (Rubisco) than cv. Nipponbare.”
t0“Rice”
t1“Rice”
Claim · model-written summary
Akenohoshi maintains more Rubisco than Nipponbare during ripening.
- Taxon
- riceOryza sativat0
- Material
- Akenohoshie0
- Gene
- ribulose‐1,5‐bisphosphate carboxylase/oxygenase (Rubisco)e0
- Outcome
- level of ribulose‐1,5‐bisphosphate carboxylase/oxygenase (Rubisco)e0
- Direction
- highere0
- Comparator
- Nipponbaree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cultivar Akenohoshi can realize a higher rate of photosynthesis during ripening by maintaining a higher level of ribulose‐1,5‐bisphosphate carboxylase/oxygenase (Rubisco) than cv. Nipponbare.”
t0“Rice”
t1“Rice”
Claim · model-written summary
Additional nitrogen fertilizer maintained high Rubisco content.
- Taxon
- riceOryza sativat0
- Treatment
- additional nitrogen fertilizer (NF)e0
- Gene
- Rubiscoe0
- Outcome
- Rubisco contente0
- Direction
- remained highe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Rubisco content remained high not only in plants given additional nitrogen fertilizer (NF) but also in plants sprayed with 6‐benzylaminopurine (BA).”
t0“Rice”
t1“Rice”
Claim · model-written summary
BA spraying maintained high Rubisco content.
- Taxon
- riceOryza sativat0
- Treatment
- sprayed with 6‐benzylaminopurine (BA)e0
- Gene
- Rubiscoe0
- Outcome
- Rubisco contente0
- Direction
- remained highe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Rubisco content remained high not only in plants given additional nitrogen fertilizer (NF) but also in plants sprayed with 6‐benzylaminopurine (BA).”
t0“Rice”
t1“Rice”
Claim · model-written summary
Rubisco content correlated closely with rbcL and rbcS mRNA levels.
- Taxon
- riceOryza sativat0
- Gene
- rbcL and rbcS mRNAse0
- Outcome
- Rubisco contente0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was a close correlation between the Rubisco content and the level of rbcL and rbcS mRNAs.”
t0“Rice”
t1“Rice”
Claim · model-written summary
High leaf Rubisco and rbcL/rbcS mRNA levels were related to high leaf nitrogen across treatments and cultivars.
- Taxon
- riceOryza sativat0
- Organ / stage
- leavese0
- Compound
- nitrogene0
- Outcome
- high leaf levels of Rubisco and of rbcL and rbcS mRNAse0
- Qualifier
- irrespective of the treatments and cultivarse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The maintenance of high leaf levels of Rubisco and of rbcL and rbcS mRNAs was related to the high nitrogen content in leaves, irrespective of the treatments and cultivars.”
t0“Rice”
t1“Rice”
Claim · model-written summary
BA increased nitrogen partitioning to leaves.
- Taxon
- riceOryza sativat0
- Treatment
- BAe0
- Outcome
- nitrogen partitioning to leavese0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The maintenance of high leaf nitrogen content was caused by an increase in nitrogen partitioning to leaves and not by an increase in nitrogen absorption by plants treated with BA.”
t0“Rice”
t1“Rice”
Claim · model-written summary
BA did not increase nitrogen absorption.
- Taxon
- riceOryza sativat0
- Treatment
- BAe0
- Outcome
- nitrogen absorptione0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“not by an increase in nitrogen absorption by plants treated with BA”
t0“Rice”
t1“Rice”
Claim · model-written summary
The authors infer that BA directly induces Rubisco synthesis.
- Taxon
- riceOryza sativat0
- Treatment
- BAe0
- Gene
- Rubiscoe0
- Outcome
- synthesis of Rubiscoe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“One is the direct effect of BA inducing the synthesis of Rubisco.”
t0“Rice”
t1“Rice”
Claim · model-written summary
The authors infer that BA indirectly promotes nitrogen partitioning to leaves.
- Taxon
- riceOryza sativat0
- Treatment
- BAe0
- Outcome
- effective partitioning of nitrogen to leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The other is the indirect effect of BA inducing the effective partitioning of nitrogen to leaves.”
t0“Rice”
t1“Rice”
Claim · model-written summary
Cytokinins could explain cultivar differences in the decline of leaf Rubisco during senescence.
- Taxon
- riceOryza sativat0
- Organ / stage
- senescencee0
- Compound
- Cytokininse0
- Outcome
- difference in the reduction in leaf level of Rubiscoe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cytokinins could account for the difference in the reduction in leaf level of Rubisco during senescence between the rice cultivars.”
t0“Rice”
t1“Rice”
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