Fig. 5.

Effect of NRE treatment on root biomass (A, B) and individual axial root length (C, D) of different root classes under high-N and low-N conditions in the greenhouse mesocosms. Each column represents the mean of n=4 for each treatment. Error bars represent SEs, and columns with the same letter under the same root class were not significantly different at P≤0.05 according to Tukey’s test. ER, embryonic root; NR1, first whorl nodal root; NR2, second whorl nodal root; NR3, third whorl nodal root, NR4, fourth whorl nodal root; NR5, fifth whorl nodal root; NR6, sixth whorl nodal root