Abstract
Crops losses to tropospheric ozone (O(3)) in the United States are estimated to cost $1-3 billion annually. This challenge is expected to increase as O(3) concentrations ([O(3)]) rise over the next half century. This study tested the hypothesis that there is cultivar variation in the antioxidant, photosynthetic and yield response of soybean to growth at elevated [O(3)]. Ten cultivars of soybean were grown at elevated [O(3)] from germination through maturity at the Soybean Free Air Concentration Enrichment facility in 2007 and six were grown in 2008. Photosynthetic gas exchange, leaf area index, chlorophyll content, fluorescence and antioxidant capacity were monitored during the growing seasons in order to determine if changes in these parameters could be used to predict the sensitivity of seed yield to elevated [O(3)]. Doubling background [O(3)] decreased soybean yields by 17%, but the variation in response among cultivars and years ranged from 8 to 37%. Chlorophyll content and photosynthetic parameters were positively correlated with seed yield, while antioxidant capacity was negatively correlated with photosynthesis and seed yield, suggesting a trade-off between antioxidant metabolism and carbon gain. Exposure response curves indicate that there has not been a significant improvement in soybean tolerance to [O(3)] in the past 30 years.
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Claims 7
Claim · model-written summary
Doubling background ozone reduced soybean yield by 17%.
- Taxon
- soybean
Glycine maxe0 - Treatment
- Doubling background [O(3)]e0
- Outcome
- soybean yieldse0
- Direction
- decreasede0
- Value
- 17%e0
- Comparator
- background [O(3)]e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Doubling background [O(3)] decreased soybean yields by 17%”
Claim · model-written summary
Cultivar and year variation in ozone yield response ranged from 8 to 37%.
Not reportedTaxon
Verbatim
e0“the variation in response among cultivars and years ranged from 8 to 37%”
Claim · model-written summary
Chlorophyll content correlated positively with seed yield.
Not reportedTaxonOrgan / stage
Verbatim
e0“Chlorophyll content and photosynthetic parameters were positively correlated with seed yield”
Claim · model-written summary
Photosynthetic parameters correlated positively with seed yield.
- Outcome
- seed yielde0
- Direction
- positively correlatede0
- Qualifier
- photosynthetic parameterse0
- Setting
- photosynthetic parameterse0
Not reportedTaxon
Verbatim
e0“Chlorophyll content and photosynthetic parameters were positively correlated with seed yield”
Claim · model-written summary
Antioxidant capacity correlated negatively with photosynthesis.
Not reportedTaxon
Verbatim
e0“antioxidant capacity was negatively correlated with photosynthesis and seed yield”
Claim · model-written summary
Antioxidant capacity correlated negatively with seed yield.
Not reportedTaxon
Verbatim
e0“antioxidant capacity was negatively correlated with photosynthesis and seed yield”
Claim · model-written summary
Ozone tolerance has not significantly improved in 30 years.
- Taxon
- soybeanGlycine maxe0
- Outcome
- tolerance to [O(3)]e0
- Direction
- not been a significant improvemente0
- Value
- 30 yearse0
- Setting
- past 30 yearse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there has not been a significant improvement in soybean tolerance to [O(3)] in the past 30 years”
The same questions in other papers
ozone · yield · Glycine max (soybean)Positive and negative results
31 papers in the same direction as this paper · 4 in the opposite direction
- positive
- negative
- negative
32 papers more in this group
See all 36 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.