N Absorption, Transport, and Recycling in Nodulated Soybean Plants by Split-Root Experiment Using 15N-Labeled Nitrate

Nitrate concentration is variable in soils, so the absorbed N from roots a high-nitrate site recycled shoots to root parts N-poor niche. In this report, absorption, transport, and recycling of derived 15N-labeled nitrate were investigated with split-root systems nodulated soybean. The NO3− accumulated 5 mM solution; however, it was not detected nodules an N-free pot, indicating that itself leaves underground parts. total amount 15NO3− absorption 2 4 days plant opposite half-root accelerated by 40% compared both half-roots received NO3−. This result might be due compensation for demand under one could absorb About 2–3% 15N half-root, irrespective or solution, suggesting affected presence absence Concentrations asparagine increased supplied but half-roots, may systemic signal status.