Figure 2

Physiological traits in popcorn inbred lines under different N supplies. NUE nitrogen use and efficiency (mg mg⁻¹), NUpE nitrogen uptake efficiency (mg mg⁻¹), NUtE nitrogen utilization efficiency (mg mg⁻¹), NTrE nitrogen translocation efficiency (mg mg⁻¹), A net photosynthetic rate (µmol m⁻² s⁻¹), g_s stomatal conductance (mmol H₂O m⁻² s⁻¹), E transpiration rate (mmol m⁻² s⁻¹), SPAD relative chlorophyll content. Bar graphs were generated in R version 3.6.2 (https://www.r-project.org/).