Fig. 2.

Effect of homogeneous and heterogeneous Pi supply on (A) total root length, (B) the proportion of different root types in total root length and (C) root phenotype of maize plants at 6 DAT. Maize plants receiving different Pi supplies were grown in a split-root system with both compartments receiving Pi (HP), one compartment receiving Pi (Hetero-HP) and the other receiving no Pi (Hetero-LP), or neither compartment receiving Pi (LP). In the homogeneous treatments, only one randomly chosen compartment was compared. Bars indicate means ± s.e. (n = 6 individual plants). Different letters indicate significant differences among treatments on each given day (P < 0.05). ns, not significant.