Abstract
Soybean yield is limited primarily by abiotic constraints. No transgenic soybean with improved abiotic stress tolerance is commercially available. We transformed soybean plants with genetic constructs able to express the sunflower transcription factor HaHB4, which confers drought tolerance to Arabidopsis and wheat. One line (b10H) carrying the sunflower promoter was chosen among three independent lines because it exhibited the best performance in seed yield, and was evaluated in the greenhouse and in 27 field trials in different environments in Argentina. In greenhouse experiments, transgenic plants showed increased seed yield under stress conditions together with greater epicotyl diameter, larger xylem area, and increased water use efficiency compared with controls. They also exhibited enhanced seed yield in warm and dry field conditions. This response was accompanied by an increase in seed number that was not compensated by a decrease in individual seed weight. Transcriptome analysis of plants from a field trial with maximum difference in seed yield between genotypes indicated the induction of genes encoding redox and heat shock proteins in b10H. Collectively, our results indicate that soybeans transformed with HaHB4 are expected to have a reduced seed yield penalty when cultivated in warm and dry conditions, which constitute the best target environments for this technology.
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Claims 9
Claim · model-written summary
The b10H line had the best seed yield among three independent lines.
- Taxon
- soybean
Glycine maxt0 - Material
- b10He0
- Outcome
- seed yielde0
- Direction
- beste0
- Comparator
- three independent linese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean”
e0“One line (b10H) carrying the sunflower promoter was chosen among three independent lines because it exhibited the best performance in seed yield”
Claim · model-written summary
Transgenic soybean had increased seed yield under greenhouse stress relative to controls.
- Taxon
- soybeanGlycine maxt0
- Treatment
- transgenic plantse0
- Outcome
- seed yielde0
- Direction
- increasede0
- Qualifier
- under stress conditionse0
- Comparator
- controlse0
- Setting
- greenhouse experimentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean”
e0“In greenhouse experiments, transgenic plants showed increased seed yield under stress conditions together with greater epicotyl diameter, larger xylem area, and increased water use efficiency compared with controls”
Claim · model-written summary
Transgenic soybean had greater epicotyl diameter and xylem area under greenhouse stress than controls.
- Taxon
- soybeanGlycine maxt0
- Treatment
- transgenic plantse0
- Outcome
- epicotyl diameter, larger xylem areae0
- Direction
- greatere0
- Comparator
- controlse0
- Setting
- greenhouse experimentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean”
e0“In greenhouse experiments, transgenic plants showed increased seed yield under stress conditions together with greater epicotyl diameter, larger xylem area, and increased water use efficiency compared with controls”
Claim · model-written summary
Transgenic soybean had increased water use efficiency under greenhouse stress versus controls.
- Taxon
- soybeanGlycine maxt0
- Treatment
- transgenic plantse0
- Outcome
- water use efficiencye0
- Direction
- increasede0
- Comparator
- controlse0
- Setting
- greenhouse experimentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean”
e0“In greenhouse experiments, transgenic plants showed increased seed yield under stress conditions together with greater epicotyl diameter, larger xylem area, and increased water use efficiency compared with controls”
Claim · model-written summary
Transgenic soybean had enhanced seed yield in warm and dry field conditions.
- Taxon
- soybeanGlycine maxt0
- Treatment
- transgenic plantse1
- Outcome
- seed yielde0
- Direction
- enhancede0
- Qualifier
- warm and drye0
- Setting
- field conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean”
e0“They also exhibited enhanced seed yield in warm and dry field conditions”
e1“transgenic plants showed increased seed yield under stress conditions”
Claim · model-written summary
The field yield response was accompanied by increased seed number.
- Taxon
- soybeanGlycine maxt0
- Outcome
- seed numbere0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean”
e0“This response was accompanied by an increase in seed number that was not compensated by a decrease in individual seed weight”
Claim · model-written summary
The increase in seed number was not offset by reduced individual seed weight.
- Taxon
- soybeanGlycine maxt0
- Outcome
- individual seed weighte0
- Direction
- not compensated by a decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean”
e0“This response was accompanied by an increase in seed number that was not compensated by a decrease in individual seed weight”
Claim · model-written summary
Field transcriptome analysis indicated induction of genes encoding redox and heat shock proteins in b10H.
- Taxon
- soybeanGlycine maxt0
- Material
- b10He0
- Gene
- genes encoding redox and heat shock proteinse0
- Outcome
- induction of genes encoding redox and heat shock proteinse0
- Direction
- inductione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean”
e0“Transcriptome analysis of plants from a field trial with maximum difference in seed yield between genotypes indicated the induction of genes encoding redox and heat shock proteins in b10H”
Claim · model-written summary
HaHB4 soybean is expected to have reduced seed yield penalty in warm and dry conditions.
- Taxon
- soybeansGlycine maxe0
- Gene
- HaHB4e0
- Outcome
- seed yield penaltye0
- Direction
- reducede0
- Qualifier
- warm and dry conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybeans transformed with HaHB4 are expected to have a reduced seed yield penalty when cultivated in warm and dry conditions”