Abstract
As an essential macronutrient, nitrogen (N) is one of the most important factors which could limit agricultural productivity and plays an important role in rice yield formation. To investigate the genetic mechanism of N absorption and utilization efficiency and to improve N utilization efficiency in rice a QTL analysis was done. The main-effect quantitative trait loci (QTLs), epistatic QTLs and QTL-by-environment interactions (QEs) for nitrogen content (NC) of plant shoot at heading and mature stages in two N conditions were identified using a double haploid population derived from a cross between a japonica Chun Jiang06 (CJ06) and an indica Taichung Native 1 (TN1). A total of three NC QTLs were detected on chromosomes 5, 6 and 8 in two N conditions. The phenotypic variation explained by individual QTL ranged from 9.73 to 39.50%. Two pairs of digenic epistatic loci were associated with NC. The QTL qNc8-4 was detected in both high nitrogen (HN) and low nitrogen (LN) conditions, and explained phenotypic variation 18.35% and 39.5% in HN and LN conditions, respectively. The analysis revealed that the additive effect of qNc8-4 came from TN1. Then the qNc8-4 was considered as the main effect loci affecting NC of rice shoot. We suggest that QTL markers of qNc8-4, RM4085 and RM1111, expressing in LN conditions, may be used to improve the N absorption and utilization efficiency in low input rice varieties through marker assisted selection (MAS) breeding programs. It is the first time to use a genetic population like this to map the QTLs of NC of plant shoot in rice, and these results will supply references and research forecast for further study on practicable methods of N utilization, cloning the genes which affect NC and improving N utilization efficiency of varieties by MAS.
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Claims 9
Claim · model-written summary
Three shoot nitrogen-content QTLs were detected on chromosomes 5, 6, and 8.
- Taxon
- rice
Oryza sativat0 - Outcome
- NC QTLs were detected on chromosomes 5, 6 and 8e0
- Value
- threee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A total of three NC QTLs were detected on chromosomes 5, 6 and 8 in two N conditions”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Individual QTLs explained 9.73 to 39.50% of phenotypic variation.
- Taxon
- riceOryza sativat0
- Outcome
- phenotypic variation explained by individual QTLe0
- Value
- 9.73 to 39.50%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The phenotypic variation explained by individual QTL ranged from 9.73 to 39.50%”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Two pairs of digenic epistatic loci were associated with nitrogen content.
- Taxon
- riceOryza sativat0
- Gene
- digenic epistatic locie0
- Outcome
- NCe0
- Value
- Two pairse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two pairs of digenic epistatic loci were associated with NC”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
qNc8-4 was detected under both high and low nitrogen.
- Taxon
- riceOryza sativat0
- Gene
- qNc8-4e0
- Outcome
- detected in both high nitrogen (HN) and low nitrogen (LN) conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The QTL qNc8-4 was detected in both high nitrogen (HN) and low nitrogen (LN) conditions”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
qNc8-4 explained 18.35% of variation under high nitrogen.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“explained phenotypic variation 18.35% and 39.5% in HN and LN conditions, respectively”
e1“QTL qNc8-4”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
qNc8-4 explained 39.5% of variation under low nitrogen.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“explained phenotypic variation 18.35% and 39.5% in HN and LN conditions, respectively”
e1“QTL qNc8-4”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
The additive effect of qNc8-4 came from TN1.
- Taxon
- riceOryza sativat0
- Material
- TN1e0
- Gene
- qNc8-4e0
- Outcome
- additive effect of qNc8-4 came from TN1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the additive effect of qNc8-4 came from TN1”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
The authors considered qNc8-4 the main-effect locus for rice shoot nitrogen content.
- Taxon
- riceOryza sativae0
- Gene
- qNc8-4e0
- Outcome
- main effect loci affecting NC of rice shoote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“qNc8-4 was considered as the main effect loci affecting NC of rice shoot”
Claim · model-written summary
The authors suggest qNc8-4 markers RM4085 and RM1111 for marker-assisted improvement of low-input rice.
- Taxon
- riceOryza sativae0
- Gene
- qNc8-4e0
- Outcome
- improve the N absorption and utilization efficiency in low input rice varietiese0
- Qualifier
- RM4085 and RM1111e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“QTL markers of qNc8-4, RM4085 and RM1111, expressing in LN conditions, may be used to improve the N absorption and utilization efficiency in low input rice varieties through marker assisted selection (MAS) breeding programs”