Abstract
Abstract Low fertilizer nitrogen efficiency and high fertilizer input in agriculture cause serious environmental pollution and waste of fertilizers. In order to select nitrogen-efficient cultivars, field experiments were conducted with 199 rice (Oryza sativa L., japonica) cultivars/lines at three nitrogen levels (0, 126 and 180 kg N/ha) in order to screen the differences of genotypes in nitrogen efficiency. Results showed that genotype is the dominating factor in determining grain yield rather than environmental factors. In general, grain yield relies on: 1) nitrogen uptake and biomass; 2) grain nitrogen use efficiency and physiological nitrogen use efficiency; and 3) harvest index and nitrogen harvest index. The N-efficient cultivars are LA19, XS48, MJ199, YJ38, HD and GD4, and N-inefficient cultivars are DN413, HJ19, FNXHM, NY1819 and ELIO. Our results demonstrated that nitrogen use efficiency is a genetic character of these cultivars, and those selected N-efficient cultivars may be applied in agricultural systems with low nitrogen input and still produce high yield. These cultivars are therefore ideal plants for studying the genetic and molecular mechanisms of nitrogen use efficiency.
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Claims 9
Claim · model-written summary
Genotype dominated environmental factors in determining rice grain yield.
- Taxon
- rice
Oryza sativae1 - Material
- genotypee0
- Outcome
- grain yielde0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“genotype is the dominating factor in determining grain yield rather than environmental factors”
e1“rice (Oryza sativa L., japonica) cultivars/lines”
Claim · model-written summary
Rice grain yield relied on nitrogen uptake and biomass.
- Taxon
- riceOryza sativae1
- Outcome
- grain yielde0
- Qualifier
- nitrogen uptake and biomasse0
Not reportedOrgan / stageDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“grain yield relies on: 1) nitrogen uptake and biomass”
e1“rice (Oryza sativa L., japonica) cultivars/lines”
Claim · model-written summary
Rice grain yield relied on grain and physiological nitrogen use efficiency.
- Taxon
- riceOryza sativae2
- Outcome
- grain yielde1
- Qualifier
- grain nitrogen use efficiency and physiological nitrogen use efficiencye0
Not reportedMaterialDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“grain nitrogen use efficiency and physiological nitrogen use efficiency”
e1“grain yield relies on:”
e2“rice (Oryza sativa L., japonica) cultivars/lines”
Claim · model-written summary
Rice grain yield relied on harvest index and nitrogen harvest index.
- Taxon
- riceOryza sativae2
- Outcome
- grain yielde1
- Qualifier
- harvest index and nitrogen harvest indexe0
Not reportedMaterialDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“harvest index and nitrogen harvest index”
e1“grain yield relies on:”
e2“rice (Oryza sativa L., japonica) cultivars/lines”
Claim · model-written summary
LA19, XS48, MJ199, YJ38, HD and GD4 were nitrogen efficient rice cultivars.
- Taxon
- riceOryza sativae1
- Material
- LA19, XS48, MJ199, YJ38, HD and GD4e0
- Outcome
- N-efficiente0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N-efficient cultivars are LA19, XS48, MJ199, YJ38, HD and GD4”
e1“rice (Oryza sativa L., japonica) cultivars/lines”
Claim · model-written summary
DN413, HJ19, FNXHM, NY1819 and ELIO were nitrogen inefficient rice cultivars.
- Taxon
- riceOryza sativae1
- Material
- DN413, HJ19, FNXHM, NY1819 and ELIOe0
- Outcome
- N-inefficiente0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N-inefficient cultivars are DN413, HJ19, FNXHM, NY1819 and ELIO”
e1“rice (Oryza sativa L., japonica) cultivars/lines”
Claim · model-written summary
The authors interpret nitrogen use efficiency as a genetic character of these cultivars.
- Taxon
- riceOryza sativae1
- Outcome
- nitrogen use efficiencye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrogen use efficiency is a genetic character of these cultivars”
e1“rice (Oryza sativa L., japonica) cultivars/lines”
Claim · model-written summary
The selected nitrogen efficient rice cultivars may yield highly under low nitrogen input.
- Taxon
- riceOryza sativae1
- Outcome
- may be applied in agricultural systems with low nitrogen input and still produce high yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“those selected N-efficient cultivars may be applied in agricultural systems with low nitrogen input and still produce high yield”
e1“rice (Oryza sativa L., japonica) cultivars/lines”
Claim · model-written summary
The selected cultivars are proposed as material for studying nitrogen efficiency mechanisms.
- Taxon
- riceOryza sativae1
- Outcome
- ideal plants for studying the genetic and molecular mechanisms of nitrogen use efficiencye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These cultivars are therefore ideal plants for studying the genetic and molecular mechanisms of nitrogen use efficiency”
e1“rice (Oryza sativa L., japonica) cultivars/lines”