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Effect of homogeneous and heterogeneous Pi supply on the expression patterns of auxin-related genes in first-order LRs. Expression of (A) ZmPIN1a, (B) ZmPIN9 and (C) ZmARF2 relative to that observed in first-order LRs of the HP treatment at 2 DAT was determined by qRT–PCR. For explanation of treatments see the legend of Fig. 2. Bars indicate means ± s.e. (n = 6 individual plants). Different letters indicate significant differences among treatments on each given day (P < 0.05).
