Phosphorus accumulation and utilization efficiency in soybean plant under atmospheric CO2 enrichment

다국어 초록 (Multilingual Abstract)

Soybean plants(Glycine max〔L.〕merr.)inoculated with Bradyrnizobium japunicum MN110 were grown In growth chambers under 400 or 800㎕·l^(-1) atmospheric CO_(2)and harvested at 25, 32, and 35 DAT to examine the effect of CO_(2)enrichment on phosphorus accumulation, uptake, and utilization efficiency during vegetative growth. Phosphorus concentration in leaf was lower in high CO_(2)plant by 47% at 25 DAT and 34% at 35 DAT than that in the control plant but phosphorus concentrations in stem, root and nodule were not affected by CO_(2)enrichment. Total phosphorus accumulation increased 3.9-fold in high CO_(2)plant and 3.2-fold in the control plant between 25 and 35 DAT. Elevated CO_(2)caused a decrease in the whole plant phosphorus concentration by 35%, which was due almost entirely to a decrease In the phosphorus concentration of leaves, CO_(2)enrichment increased phosphorus utilization efficiency in the whole plant by 70% during the experimental period. Plants exposed to high CO_(2)had larger root systems than under ambient CO_(2)but high CO_(2)plants had lower P-uptake efficiency. Averaged over four harvests, plants at high CO_(2)had 38%larger root mass that was more than offset the 20% lower efficiency of P-uptake and accounted for increased phosphorus accumulation by high CO_(2)plant. These results suggest that the reduced phosphorus concentration in soybean plant under CO_(2)enrichment may be an acclimation response to high CO_(2)concentration or enhanced starch accumulation, resulting in the plants to have a lower phosphorus requirement on a unit dry weight basis or a high phosphorus utilization efficiency under these conditions.

목차 (Table of Contents)

• Materials and Method
• Results and Discussion
• Acknowledgment
• References