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Effect of the auxin polar transport inhibitor NPA on (A) total root length and (B) first-order LR density of maize plants at 6 DAT. NPA was applied to all solutions in the split-root container. 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 (P < 0.05).
