Abstract
Tolerance to low nitrogen and low phosphorus conditions is a highly desired characteristic for sustainable crop production. In this study, a set of 125 chromosome segment substitution lines (CSSL), each containing a single or few introgression segments from a japonica cv. Nipponbare with the genetic background of an indica cv. 9311, were evaluated using augmented design under the field experiment with normal, low nitrogen (N0), and low phosphorus (P0) conditions. The grain yield and panicle number per plant were measured for each CSSL, and their relative values based on N0 or P0 and normal conditions were considered as the measurement for tolerance to low soil nutrient. The results showed that both the N0 and P0 conditions had strong negative effect on yield and panicle number, and there were different responses among the CSSLs to the stresses, and the relative traits had a significant nega- tive correlation with the traits under the normal condition. 9311 showed better tolerance to low nutrient conditions than Nipponbare. A total of 38 chromosomal regions or quantitative trait loci (QTL) all with negative allelic effects from Nipponbare were detected for the measured traits under the nitrogen and the phosphorus stresses, of those 26 QTLs were for the yield and panicle number, 12 QTLs for the relative traits. Five chromosomal regions were identified in common under both the stresses, while most QTLs (81%) were specifically detected only in low nitrogen or phosphorus condition. Such different QTLs suggest that the responses to limiting nitrogen and phosphorus conditions are regulated by different sets of genes in rice. Most QTLs for the relative traits were co-localized with those for the yield and the panicle number under either nitrogen or phosphorus stresses, indicating that the tolerance QTLs may be involved in nitrogen and phosphorus uptake or assimilation pathway in rice.
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Claims 13
Claim · model-written summary
Low nitrogen reduced rice yield and panicle number.
- Taxon
- Rice
Oryza sativat0 - Treatment
- low nitrogen (N0)e1
- Outcome
- yield and panicle numbere0
- Direction
- negativee0
- Comparator
- normale2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both the N0 and P0 conditions had strong negative effect on yield and panicle number”
t0“Rice”
e1“low nitrogen (N0)”
e2“normal, low nitrogen (N0), and low phosphorus (P0) conditions”
Claim · model-written summary
Low phosphorus reduced rice yield and panicle number.
- Taxon
- RiceOryza sativat0
- Treatment
- low phosphorus (P0)e1
- Outcome
- yield and panicle numbere0
- Direction
- negativee0
- Comparator
- normale2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both the N0 and P0 conditions had strong negative effect on yield and panicle number”
t0“Rice”
e1“low phosphorus (P0)”
e2“normal, low nitrogen (N0), and low phosphorus (P0) conditions”
Claim · model-written summary
Rice CSSLs varied in their responses to nutrient stresses.
- Taxon
- RiceOryza sativat0
- Material
- CSSLse0
- Outcome
- different responsese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there were different responses among the CSSLs to the stresses”
t0“Rice”
Claim · model-written summary
Relative traits under nutrient stress were negatively correlated with traits under normal conditions.
- Taxon
- RiceOryza sativat0
- Outcome
- relative traitse0
- Direction
- nega- tive correlatione0
- Comparator
- traits under the normal conditione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the relative traits had a significant nega- tive correlation with the traits under the normal condition”
t0“Rice”
Claim · model-written summary
9311 tolerated low nutrient conditions better than Nipponbare.
- Taxon
- RiceOryza sativat0
- Material
- 9311e0
- Outcome
- tolerance to low nutrient conditionse0
- Direction
- bettere0
- Comparator
- Nipponbaree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“9311 showed better tolerance to low nutrient conditions than Nipponbare”
t0“Rice”
Claim · model-written summary
Thirty-eight QTLs with negative Nipponbare allelic effects were detected under nitrogen and phosphorus stress.
- Taxon
- RiceOryza sativat0
- Material
- Nipponbaree0
- Gene
- quantitative trait loci (QTL)e0
- Outcome
- chromosomal regions or quantitative trait loci (QTL)e0
- Value
- 38 chromosomal regionse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A total of 38 chromosomal regions or quantitative trait loci (QTL) all with negative allelic effects from Nipponbare were detected for the measured traits under the nitrogen and the phosphorus stresses”
t0“Rice”
Claim · model-written summary
Twenty-six QTLs were associated with yield and panicle number.
- Taxon
- RiceOryza sativat0
- Gene
- QTLse0
- Outcome
- QTLs were for the yield and panicle numbere0
- Value
- 26 QTLse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“26 QTLs were for the yield and panicle number”
t0“Rice”
Claim · model-written summary
Twelve QTLs were associated with relative traits.
- Taxon
- RiceOryza sativat0
- Gene
- QTLse0
- Outcome
- QTLs for the relative traitse0
- Value
- 12 QTLse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“12 QTLs for the relative traits”
t0“Rice”
Claim · model-written summary
Five chromosomal regions were shared across both nutrient stresses.
- Taxon
- RiceOryza sativat0
- Outcome
- chromosomal regions were identified in common under both the stressese0
- Value
- Five chromosomal regionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Five chromosomal regions were identified in common under both the stresses”
t0“Rice”
Claim · model-written summary
Most QTLs were specific to low nitrogen or low phosphorus conditions.
- Taxon
- RiceOryza sativat0
- Gene
- QTLse0
- Outcome
- specifically detected only in low nitrogen or phosphorus conditione0
- Value
- 81%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“most QTLs (81%) were specifically detected only in low nitrogen or phosphorus condition”
t0“Rice”
Claim · model-written summary
Different gene sets may regulate rice responses to limiting nitrogen and phosphorus.
- Taxon
- riceOryza sativae0
- Gene
- different sets of genese0
- Outcome
- responses to limiting nitrogen and phosphorus conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“responses to limiting nitrogen and phosphorus conditions are regulated by different sets of genes in rice”
Claim · model-written summary
Most QTLs for relative traits co-localized with yield and panicle number QTLs.
- Taxon
- RiceOryza sativat0
- Gene
- QTLse0
- Outcome
- co-localized with those for the yield and the panicle numbere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Most QTLs for the relative traits were co-localized with those for the yield and the panicle number”
t0“Rice”
Claim · model-written summary
Tolerance QTLs may be involved in nitrogen and phosphorus uptake or assimilation pathways.
- Taxon
- riceOryza sativae0
- Gene
- tolerance QTLse0
- Outcome
- nitrogen and phosphorus uptake or assimilation pathwaye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tolerance QTLs may be involved in nitrogen and phosphorus uptake or assimilation pathway in rice”
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