Differential contributions of NO3−/NH4+ to nitrogen use in response to a variable inorganic nitrogen supply in plantlets of two Brassicaceae species in vitro

摘要

BackgroundThe primary sources of nitrogen for plants have been suggested to be nitrate (NO3⁻) and ammonium (NH4⁺). However, when both nitrate and ammonium are simultaneously available to plants, it is very difficult to differentially quantify NO3⁻/NH4⁺ utilization in culture media or soil. Consequently, the contribution of NO3⁻/NH4⁺ to total inorganic nitrogen assimilation cannot be determined.