Abstract
Abstract Iron (Fe) deficiency is one of the common causes of anaemia in humans. Improving grain Fe in rice, therefore, could have a positive impact for humans worldwide, especially for those people who consume rice as a staple food. In this study, 225–269 accessions of the Bengal and Assam Aus Panel (BAAP) were investigated for their accumulation of grain Fe in two consecutive years in a field experiment under alternative wetting and drying (AWD) and continuous flooded (CF) irrigation. AWD reduced straw Fe by 40% and grain Fe by 5.5–13%. Genotype differences accounted for 35% of the variation in grain Fe, while genotype by irrigation interaction accounted for 12% of the variation in straw and grain Fe in year 1, with no significant interactions detected in year 2. Twelve rice accessions were identified as having high grain Fe for both years regardless of irrigation treatment, half of which were from BAAP aus subgroup 3 which prominently comes from Bangladesh. On average, subgroup 3 had higher grain Fe than the other four subgroups of aus . Genome‐wide association mapping identified 6 genomic loci controlling natural variation of grain Fe concentration in plants grown under AWD. For one QTL, nicotianamine synthase OsNAS3 is proposed as candidate for controlling natural variation of grain Fe in rice. The BAAP contains three haplotypes of OsNAS3 where one haplotype (detected in 31% of the individuals) increased grain Fe up to 11%. Haplotype analysis of this gene in rice suggests that the ability to detect the QTL is enhanced in the BAAP because the high Fe allele is balanced in aus , unlike indica and japonica subgroups.
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Claims 13
Claim · model-written summary
AWD reduced straw Fe by 40% relative to continuous flooded irrigation in aus rice.
Verbatim
t0“aus rice”
e1“AWD reduced straw Fe by 40% and grain Fe by 5.5–13%”
e2“in a field experiment under alternative wetting and drying (AWD) and continuous flooded (CF) irrigation”
Claim · model-written summary
AWD reduced grain Fe by 5.5–13% relative to continuous flooded irrigation in aus rice.
Verbatim
t0“aus rice”
e1“AWD reduced straw Fe by 40% and grain Fe by 5.5–13%”
e2“in a field experiment under alternative wetting and drying (AWD) and continuous flooded (CF) irrigation”
Claim · model-written summary
Genotype differences accounted for 35% of the variation in grain Fe in aus rice.
Verbatim
t0“aus rice”
e3“Genotype differences accounted for 35% of the variation in grain Fe”
Claim · model-written summary
Genotype by irrigation interaction accounted for 12% of the variation in straw and grain Fe in year 1.
Verbatim
t0“aus rice”
e4“genotype by irrigation interaction accounted for 12% of the variation in straw and grain Fe in year 1”
Claim · model-written summary
No significant genotype by irrigation interactions were detected for grain Fe in year 2.
Verbatim
t0“aus rice”
e5“no significant interactions detected in year 2”
Claim · model-written summary
Twelve rice accessions had high grain Fe in both years regardless of irrigation treatment.
- Taxon
- rice
Oryza sativae6 - Outcome
- high grain Fee6
- Value
- Twelvee6
- Qualifier
- for both years regardless of irrigation treatmente6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“aus rice”
e6“Twelve rice accessions were identified as having high grain Fe for both years regardless of irrigation treatment”
Claim · model-written summary
Half of the high grain Fe accessions were from BAAP aus subgroup 3, which comes from Bangladesh.
Verbatim
t0“aus rice”
e7“half of which were from BAAP aus subgroup 3 which prominently comes from Bangladesh”
Claim · model-written summary
On average, aus subgroup 3 had higher grain Fe than the other four aus subgroups.
Verbatim
t0“aus rice”
e1“On average, subgroup 3 had higher grain Fe than the other four subgroups of aus”
Claim · model-written summary
Genome-wide association mapping identified 6 genomic loci controlling natural variation of grain Fe concentration under AWD.
- Taxon
- aus ricet0
- Treatment
- AWDe2
- Outcome
- natural variation of grain Fe concentratione2
- Value
- 6 genomic locie2
Not reportedDirection
Verbatim
t0“aus rice”
e2“Genome‐wide association mapping identified 6 genomic loci controlling natural variation of grain Fe concentration in plants grown under AWD”
Claim · model-written summary
The nicotianamine synthase OsNAS3 is proposed as a candidate gene for natural variation of grain Fe in rice.
- Taxon
- riceOryza sativae3
- Gene
- OsNAS3e3
- Outcome
- natural variation of grain Fee3
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“aus rice”
e3“For one QTL, nicotianamine synthase OsNAS3 is proposed as candidate for controlling natural variation of grain Fe in rice”
Claim · model-written summary
The BAAP contains three haplotypes of OsNAS3.
Verbatim
t0“aus rice”
e4“The BAAP contains three haplotypes of OsNAS3”
Claim · model-written summary
One OsNAS3 haplotype increased grain Fe by up to 11% in the BAAP.
Verbatim
t0“aus rice”
e5“one haplotype (detected in 31% of the individuals) increased grain Fe up to 11%”
Claim · model-written summary
The ability to detect the QTL is enhanced in the BAAP because the high Fe allele is balanced in aus.
Verbatim
t0“aus rice”
e6“Haplotype analysis of this gene in rice suggests that the ability to detect the QTL is enhanced in the BAAP because the high Fe allele is balanced in aus”
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