Physiological Response at Different Plant Development Stages in Glycine max Exposed to Elevated CO2 Concentrations and Fly Ash-Amended Soils
Rodriguez, Judith Hebelen | Klumpp, Andreas | Högy, Petra | Fangmeier, Andreas | Maestri, Damián Modesto | Lamarque, Alicia | Labuckas, Diana | Pignata, María Luisa
Increasing concentrations of carbon dioxide and heavy metals in soils through pollution are serious problems worldwide. In the present study, we investigated the impacts of elevated atmospheric CO₂ and fly ash (FA)-amended soil on the physiological response (chlorophyll content, non-structural carbohydrates, oil and total proteins) of soybean [Glycine max (L.) Merrill] at three growth stages (vegetative, reproductive and maturity). An increase in plant growth and biomass was observed at elevated CO₂ and for moderate concentrations of FA in amended soils in all development plant stages. In contrast to these results, a different response pattern was found for the chlorophyll content and non-structural carbohydrates in relation to the developmental stage, showing that even though in the vegetative growth stage the highest concentration of chlorophylls corresponded to elevated CO₂ conditions. An opposite result was observed during the grain filling stage (reduction of chlorophylls of 15 % at ambient CO₂ conditions for the treatments 10, 15, and 25 % of FA), which probably is related with the distribution of nutrients at this stage. Regarding to oil and total protein content an increase was observed at elevated CO₂ and high concentrations of FA in amended soils. Our findings demonstrate that elevated CO₂ and FA-amended soils alter the physiological response of soybean affecting the crop quality.
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