Abstract
To clarify the factors responsible for the maintenance of a high rate of photosynthesis at the ripening stage in the high-yield rice cultivar Akenohoshi, as compared with that in a Japanese standard cultivar, Nipponbare, we investigated the nitrogen content of leaves, focusing on the accumulation and the partitioning of nitrogen in rice plants. The nitrogen content of leaves of plants that were grown in the field or in pots remained higher in Akenohoshi than in Nipponbare during the ripening stage, and there was a close correlation between the rate of photosynthesis and the nitrogen content irrespective of cultivar and treatment. The accumulation of nitrogen in the whole plant was greater in Akenohoshi than in Nipponbare before heading and during the ripening stage. The extent of partitioning of nitrogen to leaves was higher and that to ears was lower in Akenohoshi than in Nipponbare during the ripening stage. By application of additional nitrogen fertilizer to Nipponbare, the nitrogen content of leaves was increased as a result of the increased accumulation of nitrogen in the whole plant and the enhanced partitioning of nitrogen to leaves. Our results indicate that the higher nitrogen content of Akenohoshi leaves was due to the greater accumulation of nitrogen in the plant before heading and during the ripening stage and the more effective partitioning of nitrogen to leaves during the ripening stage, which resulted in the maintenance of a high rate of photosynthesis during ripening.
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Claims 8
Claim · model-written summary
Leaf nitrogen remained higher in Akenohoshi than Nipponbare during ripening.
Verbatim
e0“The nitrogen content of leaves of plants that were grown in the field or in pots remained higher in Akenohoshi than in Nipponbare during the ripening stage”
Claim · model-written summary
Photosynthesis rate closely correlated with leaf nitrogen content.
- Taxon
- Rice
Oryza sativat0 - Compound
- nitrogene0
- Outcome
- rate of photosynthesise0
- Qualifier
- irrespective of cultivar and treatmente0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was a close correlation between the rate of photosynthesis and the nitrogen content irrespective of cultivar and treatment”
t0“Rice”
Claim · model-written summary
Whole-plant nitrogen accumulation was greater in Akenohoshi before heading and during ripening.
Verbatim
e0“The accumulation of nitrogen in the whole plant was greater in Akenohoshi than in Nipponbare before heading and during the ripening stage.”
Claim · model-written summary
Nitrogen partitioning to leaves was higher in Akenohoshi.
- Taxon
- RiceOryza sativat0
- Material
- Akenohoshie0
- Organ / stage
- leavese0
- Outcome
- partitioning of nitrogen to leavese0
- Direction
- highere0
- Comparator
- Nipponbaree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The extent of partitioning of nitrogen to leaves was higher and that to ears was lower in Akenohoshi than in Nipponbare during the ripening stage.”
t0“Rice”
Claim · model-written summary
Nitrogen partitioning to ears was lower in Akenohoshi.
- Taxon
- RiceOryza sativat0
- Material
- Akenohoshie0
- Organ / stage
- earse0
- Outcome
- that to earse0
- Direction
- lowere0
- Comparator
- Nipponbaree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The extent of partitioning of nitrogen to leaves was higher and that to ears was lower in Akenohoshi than in Nipponbare during the ripening stage.”
t0“Rice”
Claim · model-written summary
Additional nitrogen fertilizer raised Nipponbare leaf nitrogen content.
- Taxon
- RiceOryza sativat0
- Material
- Nipponbaree0
- Treatment
- additional nitrogen fertilizere0
- Outcome
- nitrogen content of leavese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“By application of additional nitrogen fertilizer to Nipponbare, the nitrogen content of leaves was increased as a result of the increased accumulation of nitrogen in the whole plant and the enhanced partitioning of nitrogen to leaves.”
t0“Rice”
Claim · model-written summary
Additional fertilizer increased whole-plant nitrogen accumulation in Nipponbare.
- Taxon
- RiceOryza sativat0
- Material
- Nipponbaree0
- Treatment
- additional nitrogen fertilizere0
- Outcome
- accumulation of nitrogen in the whole plante0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“By application of additional nitrogen fertilizer to Nipponbare, the nitrogen content of leaves was increased as a result of the increased accumulation of nitrogen in the whole plant and the enhanced partitioning of nitrogen to leaves.”
t0“Rice”
Claim · model-written summary
Additional fertilizer enhanced nitrogen partitioning to leaves in Nipponbare.
- Taxon
- RiceOryza sativat0
- Material
- Nipponbaree0
- Treatment
- additional nitrogen fertilizere0
- Outcome
- partitioning of nitrogen to leavese0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“By application of additional nitrogen fertilizer to Nipponbare, the nitrogen content of leaves was increased as a result of the increased accumulation of nitrogen in the whole plant and the enhanced partitioning of nitrogen to leaves.”
t0“Rice”
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