Abstract
Under hydroponic group conditions,six typical rice genotypes were selected to investigate the characteristics of dry matter accumulation and distribution under three nitrogen levels of 5,15 and 25mg·kg-1.Nitrogen use efficiency for dry matter(NUEdm) and nitrogen use efficiency for grain yield(NUEg) were obviously different between different rice genotypes under three N levels.And then,six different nitrogen efficiency genotypes can be classified into two types of nitrogen-efficient and nitrogen inefficient.NUEdm increased with the nitrogen levels.Whereas,NUEg firstly increased and then decreased with the increase of nitrogen.At the four critical stages,there are significant differences in dry matter accumulation between two NUE types of rice genotypes under different N levels.At maturing stage,the ratios of culm and sheath,root,panicle dry weight to entire plant dry matter accumulation were significantly affected by N levels.At the same level of nitrogen,the average ratios of culm and sheath,root and leaves dry weight to entire plant dry matter accumulation were higher in N-inefficient genotype than that in N-efficient genotype.On the contrary,the ratio of panicle dry weight to entire plant dry matter accumulation was higher in N-efficient genotype than that in N-inefficient genotype.Significant effects of nitrogen levels were observed on the rice yield between different NUE types.N-efficient rice yields were higher than nitrogen-inefficient at the same nitrogen level.What's more,with the nitrogen level increasing,the difference of yield was more obviouser.Each organ proportion was relatively weak correlation with NUE.Correlation analysis also demonstrated that the dry matter accumulation at four critical stages of rice,the yield and the grain numbers per panicle were significantly correlated with the NUEg and NUEdm between different NUE types under different N levels.
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Claims 10
Claim · model-written summary
NUEdm increased with nitrogen level in rice
- Taxon
- rice
Oryza sativat0 - Treatment
- nitrogen levelse1
- Outcome
- NUEdme1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“RICE GENOTYPE”
e1“NUEdm increased with the nitrogen levels”
Claim · model-written summary
NUEg first increased and then decreased with rising nitrogen in rice
- Taxon
- riceOryza sativat0
- Treatment
- nitrogene2
- Outcome
- NUEge2
- Direction
- firstly increased and then decreasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“RICE GENOTYPE”
e2“NUEg firstly increased and then decreased with the increase of nitrogen”
Claim · model-written summary
N-efficient rice genotypes had higher yields than N-inefficient genotypes at the same nitrogen level
- Taxon
- riceOryza sativat0
- Material
- N-efficiente3
- Outcome
- rice yieldse3
- Direction
- highere3
- Qualifier
- at the same nitrogen levele3
- Comparator
- nitrogen-inefficiente3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“RICE GENOTYPE”
e3“N-efficient rice yields were higher than nitrogen-inefficient at the same nitrogen level”
Claim · model-written summary
The rice yield difference between NUE types became larger as nitrogen level increased
- Taxon
- riceOryza sativat0
- Treatment
- nitrogen levele4
- Outcome
- difference of yielde4
- Direction
- more obviousere4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“RICE GENOTYPE”
e4“with the nitrogen level increasing,the difference of yield was more obviouser”
Claim · model-written summary
At maturing stage, the dry matter partitioning ratios of culm and sheath, root and panicle were significantly affected by N levels
- Taxon
- riceOryza sativat0
- Organ / stage
- maturing stagee5
- Outcome
- ratios of culm and sheath, root, panicle dry weight to entire plant dry matter accumulatione5
- Qualifier
- significantly affected by N levelse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“RICE GENOTYPE”
e5“At maturing stage, the ratios of culm and sheath, root, panicle dry weight to entire plant dry matter accumulation were significantly affected by N levels”
Claim · model-written summary
N-inefficient rice genotypes had higher ratios of culm and sheath, root and leaf dry weight to whole plant dry matter than N-efficient genotypes
- Taxon
- riceOryza sativat0
- Material
- N-inefficient genotypee6
- Outcome
- average ratios of culm and sheath,root and leaves dry weight to entire plant dry matter accumulatione6
- Direction
- highere6
- Comparator
- N-efficient genotypee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“RICE GENOTYPE”
e6“At the same level of nitrogen,the average ratios of culm and sheath,root and leaves dry weight to entire plant dry matter accumulation were higher in N-inefficient genotype than that in N-efficient genotype”
Claim · model-written summary
N-efficient rice genotypes had higher panicle dry weight ratio to whole plant dry matter than N-inefficient genotypes
- Taxon
- riceOryza sativat0
- Material
- N-efficient genotypee7
- Outcome
- ratio of panicle dry weight to entire plant dry matter accumulatione7
- Direction
- highere7
- Comparator
- N-inefficient genotypee7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“RICE GENOTYPE”
e7“On the contrary,the ratio of panicle dry weight to entire plant dry matter accumulation was higher in N-efficient genotype than that in N-inefficient genotype”
Claim · model-written summary
Nitrogen levels significantly affected rice yield differently between NUE types
- Taxon
- riceOryza sativat0
- Treatment
- nitrogen levelse1
- Outcome
- rice yielde1
- Qualifier
- between different NUE typese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“RICE GENOTYPE”
e1“Significant effects of nitrogen levels were observed on the rice yield between different NUE types”
Claim · model-written summary
Organ dry matter proportions were only weakly correlated with NUE in rice
- Taxon
- riceOryza sativat0
- Organ / stage
- Each organe1
- Outcome
- organ proportione1
- Qualifier
- relatively weak correlatione1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“RICE GENOTYPE”
e1“Each organ proportion was relatively weak correlation with NUE”
Claim · model-written summary
Dry matter accumulation at four critical stages, yield and grain numbers per panicle were significantly correlated with NUEg and NUEdm
- Taxon
- riceOryza sativat0
- Organ / stage
- four critical stagese1
- Outcome
- dry matter accumulatione1
- Qualifier
- significantly correlatede1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“RICE GENOTYPE”
e1“the dry matter accumulation at four critical stages of rice, the yield and the grain numbers per panicle were significantly correlated with the NUEg and NUEdm”
The same questions in other papers
nitrogen · growth · Oryza sativa (rice)Positive and negative results
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- negative
- negative
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