Abstract
Soybean fixes atmospheric nitrogen through the symbiotic rhizobia bacteria that inhabit root nodules. Drought stress negatively affect symbiotic nitrogen fixation (SNF) in soybean. The main objective of this study was to identify allelic variations associated with SNF in short-season Canadian soybean varieties under drought stress. A diversity panel of 103 early-maturity Canadian soybean varieties was evaluated under greenhouse conditions to determine SNF-related traits under drought stress. Drought was imposed after three weeks of plant growth, where plants were maintained at 30% field capacity (FC) (drought) and 80% FC (well-watered) until seed maturity. Under drought stress, soybean plants had lower seed yield, yield components, seed nitrogen content, % nitrogen derived from the atmosphere (%Ndfa), and total seed nitrogen fixed compared to those under well-watered conditions. Significant genotypic variability among soybean varieties was found for yield, yield parameters, and nitrogen fixation traits. A genome-wide association study (GWAS) was conducted using 2.16 M single nucleotide single nucleotide polymorphisms (SNPs) for different yield and nitrogen fixation related parameters for 30% FC and their relative performance (30% FC/80% FC). In total, five quantitative trait locus (QTL) regions, including candidate genes, were detected as significantly associated with %Ndfa under drought stress and relative performance. These genes can potentially aid in future breeding efforts to develop drought-resistant soybean varieties.
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Claims 6
Claim · model-written summary
Drought-stressed soybean had lower seed yield and yield components than well-watered plants.
- Taxon
- soybean
Glycine maxe0 - Treatment
- drought stresse0
- Outcome
- seed yield, yield componentse0
- Direction
- lowere0
- Comparator
- well-watered conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under drought stress, soybean plants had lower seed yield, yield components, seed nitrogen content, % nitrogen derived from the atmosphere (%Ndfa), and total seed nitrogen fixed compared to those under well-watered conditions”
Claim · model-written summary
Drought-stressed soybean had lower seed nitrogen content than well-watered plants.
- Taxon
- soybeanGlycine maxe0
- Treatment
- drought stresse0
- Outcome
- seed nitrogen contente0
- Direction
- lowere0
- Comparator
- well-watered conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under drought stress, soybean plants had lower seed yield, yield components, seed nitrogen content, % nitrogen derived from the atmosphere (%Ndfa), and total seed nitrogen fixed compared to those under well-watered conditions”
Claim · model-written summary
Drought-stressed soybean had lower percentage of nitrogen derived from the atmosphere than well-watered plants.
- Taxon
- soybeanGlycine maxe0
- Treatment
- drought stresse0
- Outcome
- % nitrogen derived from the atmosphere (%Ndfa)e0
- Direction
- lowere0
- Comparator
- well-watered conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under drought stress, soybean plants had lower seed yield, yield components, seed nitrogen content, % nitrogen derived from the atmosphere (%Ndfa), and total seed nitrogen fixed compared to those under well-watered conditions”
Claim · model-written summary
Drought-stressed soybean had lower total seed nitrogen fixed than well-watered plants.
- Taxon
- soybeanGlycine maxe0
- Treatment
- drought stresse0
- Outcome
- total seed nitrogen fixede0
- Direction
- lowere0
- Comparator
- well-watered conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under drought stress, soybean plants had lower seed yield, yield components, seed nitrogen content, % nitrogen derived from the atmosphere (%Ndfa), and total seed nitrogen fixed compared to those under well-watered conditions”
Claim · model-written summary
Soybean varieties differed significantly in yield, yield parameters, and nitrogen fixation traits.
- Taxon
- soybeanGlycine maxe0
- Outcome
- yield, yield parameters, and nitrogen fixation traitse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant genotypic variability among soybean varieties was found for yield, yield parameters, and nitrogen fixation traits”
Claim · model-written summary
Five QTL regions including candidate genes were significantly associated with percentage of nitrogen derived from the atmosphere under drought and relative performance.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- drought stresse0
- Gene
- quantitative trait locus (QTL) regionse0
- Outcome
- %Ndfae0
- Direction
- associatede0
- Value
- fivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“five quantitative trait locus (QTL) regions, including candidate genes, were detected as significantly associated with %Ndfa under drought stress and relative performance”
t0“Soybean”
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