Abstract
Rising atmospheric [CO2] is a uniform, global change that increases C3 photosynthesis and could offset some of the negative effects of global climate change on crop yields. Genetic variation in yield responsiveness to rising [CO2] would provide an opportunity to breed more responsive crop genotypes. A multi-year study of 18 soybean (Glycine max Merr.) genotypes was carried out to identify variation in responsiveness to season-long elevated [CO2] (550 ppm) under fully open-air replicated field conditions. On average across 18 genotypes, elevated [CO2] stimulated total above-ground biomass by 22%, but seed yield by only 9%, in part because most genotypes showed a reduction in partitioning of energy to seeds. Over four years of study, there was consistency from year to year in the genotypes that were most and least responsive to elevated [CO2], suggesting heritability of CO2 response. Further analysis of six genotypes did not reveal a photosynthetic basis for the variation in yield response. Although partitioning to seed was decreased, cultivars with the highest partitioning coefficient in current [CO2 ] also had the highest partitioning coefficient in elevated [CO2]. The results show the existence of genetic variation in soybean response to elevated [CO2], which is needed to breed soybean to the future atmospheric environment.
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Claims 7
Claim · model-written summary
Elevated CO2 stimulated above-ground biomass by 22%.
- Taxon
- soybean
Glycine maxt0 - Treatment
- elevated [CO2]e0
- Outcome
- total above-ground biomasse0
- Direction
- stimulatede0
- Value
- 22%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“elevated [CO2] stimulated total above-ground biomass by 22%”
t0“soybean (Glycine max Merr.)”
Claim · model-written summary
Elevated CO2 stimulated seed yield by 9%.
- Taxon
- soybeanGlycine maxt0
- Treatment
- elevated [CO2]e0
- Outcome
- seed yielde0
- Value
- 9%e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“elevated [CO2] stimulated total above-ground biomass by 22%, but seed yield by only 9%”
t0“soybean (Glycine max Merr.)”
Claim · model-written summary
Most genotypes reduced allocation to seeds.
- Taxon
- soybeanGlycine maxt0
- Outcome
- partitioning of energy to seedse0
- Direction
- reductione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“most genotypes showed a reduction in partitioning of energy to seeds.”
t0“soybean (Glycine max Merr.)”
Claim · model-written summary
Relative genotype responsiveness was consistent across four years.
- Taxon
- soybeanGlycine maxt0
- Outcome
- consistency from year to year in the genotypese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Over four years of study, there was consistency from year to year in the genotypes that were most and least responsive to elevated [CO2]”
t0“soybean (Glycine max Merr.)”
Claim · model-written summary
Six-genotype analysis found no photosynthetic basis for yield-response variation.
- Taxon
- soybeanGlycine maxt0
- Outcome
- photosynthetic basis for the variation in yield responsee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Further analysis of six genotypes did not reveal a photosynthetic basis for the variation in yield response.”
t0“soybean (Glycine max Merr.)”
Claim · model-written summary
High seed partitioning under current CO2 corresponded to high partitioning under elevated CO2.
- Taxon
- soybeanGlycine maxt0
- Material
- cultivarse0
- Outcome
- partitioning coefficient in elevated [CO2]e0
- Direction
- higheste0
- Comparator
- current [CO2 ]e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cultivars with the highest partitioning coefficient in current [CO2 ] also had the highest partitioning coefficient in elevated [CO2].”
t0“soybean (Glycine max Merr.)”
Claim · model-written summary
The authors concluded that soybean response to elevated CO2 has genetic variation useful for breeding.
- Taxon
- soybeanGlycine maxe0
- Outcome
- genetic variation in soybean response to elevated [CO2]e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results show the existence of genetic variation in soybean response to elevated [CO2], which is needed to breed soybean to the future atmospheric environment.”
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See all 101 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.