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SoyFACE: the Effects and Interactions of Elevated [CO2] and [O3] on Soybean

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Managed Ecosystems and CO2

4.7 Conclusions

The SoyFACE experiment is the first to focus on the affects of e[CO2] and e[O3] on a seed legume under fully open-air conditions. The experiment mimicked e[CO2] and e[O3] predicted for the middle of this century and was conducted in one of the world’s major production areas for corn and soybean under cultivation and management techniques standard for the industry in the United States corn-belt region.Growth of soybean at e[CO2] resulted in an approximately 25 % increase in the daily integral of net leaf CO2 uptake, a 20% increase in the rate of light saturated CO2 uptake, a 15 % increase in seed yield, a 15 % increase in above ground primary productivity, and a 20 % increase in node number. Growth of soybean at e[CO2] also resulted in approximately a 30 % decrease in mid-day stomatal conductance, a 10 % decrease in stomatal conductance averaged over the day, an 8% decrease in the limitation of photosynthesis by stomatal conductance, and a 2–3 % decrease in harvest index.

Growth of soybean at e[CO2] caused about a 5% decrease in the ratio of maximum carboxylation capacity compared to maximum electron transport capacity, indicative of acclimation to optimize photosynthetic performance to the higher [CO2] conditions.Growth of soybean at e[CO2] extended the growing season and resulted in increased herbivory by Japanese beetles.

Growth of soybean at e[O3] was largely deleterious to soybean although the effects developed slowly over the course of the growing season. e[O3] resulted in decreases in seed yield (15–25 %), above-ground primary productivity (11–23 %), and harvest index (2–3 %). Growth at e[O3] caused accelerated senescence of the crop.

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Ort, D.R. et al. (2006). SoyFACE: the Effects and Interactions of Elevated [CO2] and [O3] on Soybean. In: Nösberger, J., Long, S.P., Norby, R.J., Stitt, M., Hendrey, G.R., Blum, H. (eds) Managed Ecosystems and CO2 . Ecological Studies, vol 187. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-31237-4_4

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